ISM 112 Instruction Manual

Transcription

1 Instruction Manual

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3 ISM112 Copyright 2004 by GANTNER INSTRUMENTS Test & Measurement GMBH, Schruns (Austria). Copyrights: Operating instructions, manuals and software are protected by copyright. All rights are reserved. Copying, duplication, translation, installation in any electronic medium or machine-readable form in whole or in part is prohibited. The sole exception is represented by creation of a back-up copy of software for own use as a safeguard, so far as this is techniqueally possible and recommended by us. Any infringement will render the party committing such infringement liable to compensation payment. Liability: Any claims against the manufacturer based on the hardware or software products described in this manual shall depend exclusively on the conditions of the guarantee. Any further-reaching claims are excluded, and in particular the manufacturer accepts no liability for the completeness or accuracy of the contents of this manual. The right is reserved to make alterations, and alterations may be made at any time without prior notice being given. Trade marks: Attention is drawn at this point to markings and registered trade marks used in this manual, in particular to those of Microsoft Corporation, International Business Machines Corporation and Intel Corporation.! Important: Before commencing installation, commissioning, putting into service and before any maintenance work is carried out, it is essential that the relevant warning and safety instructions in this manual are read! HB_ISM112_E_V221.doc 1

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5 ISM112! General warning and safety instructions: Dear customer, We congratulate you on having selected a product of (in the following: Gantner Instruments). So that our product functions in your installation with safety and to your complete satisfaction, we take this opportunity to familiarize you with the following ground rules: 1. Installation, commissioning, operation and maintenance of the product purchased must be carried out in accordance with instructions, i.e. in accordance with the technical conditions of operation, as described in the corresponding product documentation. 2. Before either installation, commissioning, operation or maintenance it is therefore essential that you read the corresponding chapter of this manual and observe its instructions. 3. If there are still some points on which you are not entirely clear, please do not take a chance, but ask the customer adviser responsible for you, or ring the Gantner Instruments hotline. 4. Where not otherwise specifically laid down, appropriate installation, commissioning, operation and maintenance of the appliance is the customer s responsibility. 5. Directly on receipt of the goods, inspect both the packaging and the appliance itself for any signs of damage. Also check that the delivery is complete (-> accessories, documentation, auxiliary devices, etc.). 6. If the packaging has been damaged in transport or should you suspect that it has been damaged or that it may have a fault, the appliance must not be put into service. In this case, contact your customer advisor. He will make every effort to resolve the problem as quickly as possible. 7. Installation, commissioning and servicing of our appliances must only be carried out by suitably trained personnel. In particular, correspondingly qualified specialists may only make electrical connections. Here, the appropriate installation provisions in accordance with the relative national Electrical Engineers construction regulations (e.g. ÖVE, [Austrian] VDE, [German]...) must be observed. 8. Where not otherwise stated, installation and maintenance work on our appliances is exclusively to be carried out when disconnected from the power supply. This applies in particular to appliances which are normally supplied by low-tension current. 9. It is prohibited to make alterations to the appliances or to remove protective shields and covers. 10. Do not attempt yourself to repair an appliance after a defect, failure or damage, or to put it back into operation again. In such cases, it is essential you contact either your customer adviser or the Gantner Instruments hotline. We will make every effort to resolve the problem as quickly as possible. 11. Gantner Instruments accepts no responsibility for any injuries or damage caused as a result of improper use. HB_ISM112_E_V221.doc 3

6 12. Although every care is taken and we are continuously aiming for improvement, we cannot exclude completely the possibility of errors appearing in our documentation. Gantner Instruments therefore accepts no responsibility for the completeness or the accuracy of this manual. The right is reserved to make alterations, and we may carry out alterations at any time without giving prior notice. 13. Should you discover any fault with the product or in its accompanying documentation, or have any suggestions for improvement, you may confidently approach either your customer adviser or Gantner Instruments directly. 14. However, even if you just want to tell us that everything has functioned perfectly, we still look forward to hearing from you. We wish you a successful application of our appliances. We will be pleased to welcome you as a customer again soon. Contact address / manufacturer: Montafonerstrasse 8 A Schruns/Austria Tel.: Fax: office@gantner-instruments.com Web: Industriestraße 12 D Darmstadt Tel.: Fax: testing@gantner-instruments.com Web: 4 HB_ISM112_E_V221.doc

7 TABLE OF CONTENTS TABLE OF CONTENTS 1. GENERAL PRELIMINARY REMARKS On This Manual Important Notice Contact for Inquiries SYSTEM DESCRIPTION System Overview Range of Application Features of Performance INSTALLATION Mounting / Fixing Protective System Ambient Temperature Front of the Appliance / Pin Assignment Connection Technique Power Supply Grounding Lightning Protection Bus Connection Sensor Connection Several Sensors at one Module Module Jack ICM Cold Junction Terminal ICJ DC Decoupling STRUCTURE OF THE BUS TOPOLOGY Bus interface Bus Structure Number of Parties Transmission Speed and Line Length Bus Cable Bus Plug Bus Termination Shielding PC Bus Connection Equipotential Bonding Adjustment of Address and Baud Rate SIGNAL PROCESSING Analog Inputs Analog Output Digital Inputs/Outputs Voltage Output (U FORCE ) Internal Reference Voltage Internal Processing Measurement Rate Signal Preparation HB_ISM112_E_V221.doc 5

8 TABLE OF CONTENTS 6. FUNCTIONAL DESCRIPTION Analog Input Variable Analog Output Variable Digital Input Variable Digital Output Variable Arithmetic Channel Setpoint Variable Alarm Variable Controller Variable Threshold Values Error Handling EXAMPLES FOR APPLICATION Measurement of Temperature with Pt100 Sensor Measurement of Temperature with Thermocouples Measurement of Pressure with KPY10 Sensor Revolution Counting INITIATION AND TEST Before Connecting the Supply After Connecting the Supply Configuration of the Sensor Module COMMUNICATION General Bus Interface Bus Protocol Character Formats Output Format ASCII-Protocol Transmission Sequence Telegram Format Instruction Set Instruction Parameters Sample Program PROFIBUS-Protocol Transmission Sequence Telegram Format Instruction Set MODBUS-Protocol Transmission Sequence Telegram Format Instruction Set Register Contents SPECIFICATIONS Power Supply Signal Inputs/Outputs Signal Processing Force Output Analog Inputs (4 per Module) Analog Output (1 per Module) Digital Inputs/Outputs (2 pro Module) HB_ISM112_E_V221.doc

9 TABLE OF CONTENTS Bus Interface: Operating Conditions: Electromagnetic Compatibility: Shell: Circuit: Accessories / Notice for Orders: SIMPLIFIED DRAWINGS Front View Side View A. PINOUT ARRANGEMENTS FOR ANALOG SENSORS FOR ISM B. PINOUT ARRANGEMENTS FOR DIGITAL SENSORS FOR ISM C. CONFIGURATION TABLE FOR ISM D. ACCURACY / RESOLUTION / NOISE / LINEARITY / T-DRIFT HB_ISM112_E_V221.doc 7

10 TABLE OF CONTENTS 1. GENERAL PRELIMINARY REMARKS 1.1. On This Manual The manual for the appliance on hand contains all important information concerning the function, installation and initiation of the Intelligent Sensor Modules ISM 112. Descriptions of the Configuration Software ICP100 are available as a short description on CD with the PC-software Important Notice Make sure to use the Intelligent Sensor Modules ISM 112 exclusively in accordance with the notices, technical data and operating conditions mentioned in this manual. In case of inexpert handling or wrong application possible disturbances, measuring errors, effects on or from other appliances and facilities as well as possible endangering of human lives or tangible assets cannot be excluded! Therefore if you have not yet worked with the Intelligent Sensor Modules ISM 112, you should first of all study the manual on hand thoroughly. While initiating or operating the appliance or in case service is required always observe the notices given in this manual. Please note further that there are other special regulations to be observed in case of application in potentially explosive surroundings (EExe, EExi,...). These are not, however, the subject of this manual, which only explains the general use of the Intelligent Sensor Modules ISM Contact for Inquiries In case of inquiries concerning the Intelligent Sensor Modules ISM 112 please turn to the branch in charge for you or directly to one of the Gantner Instruments-branch offices. The addresses, phone and fax numbers are located on the inner side of the cover. 8 HB_ISM112_E_V221.doc

11 SYSTEM DESCRIPTION 2. SYSTEM DESCRIPTION 2.1. System Overview The Intelligent Sensor Modules ISM 112 is part of a complete system for the distributed recording and processing of sensor signals and digital status information. The general term for this system of Intelligent Sensor Modules is "ISM". Several system variants of the Intelligent Sensor Modules ISM are available for the various applications. Basically these variants are distinguished by the number of their digital and analog inputs and outputs, by the number of configurable sensor variables, by their display options and operating variants and by the number of arithmetic functions. Thus there are two series of devices at the moment: The modules of the series "100", where the ISM 111, ISM 112, IDL 100 and IDL 101 belong to, are free configurable, multi-variable sensor modules. An overview of the current variants of the sensor modules will be shown on table 2.1. HB_ISM112_E_V221.doc 9

12 SYSTEM DESCRIPTION sensor modules ISM 111 ISM 112 power supply power supply VDC VDC dc-decoupling to analog part 500 V 500 V dc-decoupling to digital part 500 V 500 V inputs / outputs analog inputs 4 4 analog outputs ma digital inputs - - digital outputs - - digital inputs/outputs 4 2 relay outputs, make contact - - relay outputs, break contact - - relay outputs, change over con. - - force output, sensor supply out. 5 VDC / 50 ma 5 VDC / 50 ma measuring functions voltage measurements 0... ±10 V 0... ±10 V current measurements ma ma resistance measurements kω kω resistance bridge measurements 0... ±1V/V 0... ±1V/V potentiometric measurements 0... ±1V/V 0... ±1V/V thermocouple with external comp. yes yes thermocouple with internal comp. with ICJ 108 with ICJ 108 digital status in yes yes frequency measurement khz khz up counter khz khz up/down counter khz khz quadrature counter khz khz digital status out yes yes PWM-output % % sensor variables number 12 / / 16 communication bus interface RS-485 RS-485 Configuration program additional functions arithmetical functions extended extended PID controller no yes 10 HB_ISM112_E_V221.doc

13 SYSTEM DESCRIPTION 2.2. Range of Application The most varying measurement tasks can easily be solved by means of the different analog inputs and in combination with the force output, which provides the local power supply for the transducers. Some typical applications are e.g. measurement of temperature via resistance pyrometers or thermocouples, pressure measuring by means of wire strain gauges, or position measuring and weight measurement by displacement transducers and force transducers. With these applications the Intelligent Sensor Modules ISM 112 supports measuring methods with 2-, 3- and 4-wire technique and measuring methods with 4- and 6-wire bridge connection. With measurements of temperature via thermocouples you can also work with an internal cold junction compensation (referred to terminals) in addition to the external cold junction compensation. The preparation of signals required in accordance with the sensors used, such as amplification, linearization, offset correction etc. can be adjusted individually per software. An external amplifier is not required. The digital signal inputs can be used, among other things, to connect switches, approximation initiators, digit emitters and oscillators. Thus status indications can be collected and tasks like e.g. position measuring, displacement measurements, angular measurements, frequency measurements and timings can be carried out. All data can be transmitted via the integrated RS485 communication interface to an overriding control (PLC) or to a computer (PC). Up to 127 modules can be connected with the two-wire line over distances of several 100 m (328 ft). At the same time the communication interface serves the purpose of centrally programming and configuring the Intelligent Sensor Modules ISM for the concrete application via bus from a PC. A corresponding Configuration Software ICP 100, executable on usual commercial PCs under Windows, is part of the ISM-system Features of Performance The features of performance of the Intelligent Sensor Modules ISM 112 are the following: Function: measurement inputs for all common types of sensors several and different sensors can be connected simultaneously measured values are monitored as to programmable threshold values PID-controller function detection of sensor errors or line break detection of communication errors programmable error handling Inputs and Outputs: 4 analog inputs 1 analog output 2 digital inputs/outputs (configurable) voltage output for sensor supply HB_ISM112_E_V221.doc 11

14 SYSTEM DESCRIPTION Power Supply: power supply: VDC all connections protected against excess voltage, excess current and polarity conversion dc decoupling between power supply, analog inputs, analog output and RS485-bus interface Display and Operation: status-led for digital inputs/outputs status-led for operation and malfunction measured quantity display and parametrization with infrared remote control Measured Value Processing: linearization, scaling and conversion into physical units carried out by the sensor module option to adjust, modify or set the processing parameters individually programmable filtering function programmable averaging non-volatile storage for program, parameters and data Configuration: configurable with PC-software under Windows menu-driven sensor selection in plain text free configuration of altogether 16 variables, with Profibus-DP protocol only 12 channels data base for the most common sensors definition of user-specific sensors default of type of measurement and principle of measurement display of pin assignment input of linearization setting the limit values programmable error handling arithmetic combination of sensor variables maximum and minimum indicator function configuration on file (offline-operation) configuration via bus (online-operation) Programming: loading of a new download program allocation of address, baud rate, character format and protocol via bus automatic search for all connected sensor modules independent from the defined bus parameters 12 HB_ISM112_E_V221.doc

15 SYSTEM DESCRIPTION Communication: integrated RS 485 communication interface autonomous functioning independent of overriding systems definition of the transmission protocol (ASCII, PROFIBUS and MODBUS) definition of the telegram format (startbit/stopbit/length/parity) definition of the output format (field length/decimals/unit) simple instruction set Shell: compact structural shape attractive design fast mounting snap-on mounting on DIN rail 35 mm (1.4 inch) protection system IP20 detachable terminal strip separate Cold Junction Terminal Module Jack HB_ISM112_E_V221.doc 13

16 INSTALLATION 3. INSTALLATION 3.1. Mounting / Fixing The Intelligent Sensor Modules ISM 112 of the series "100" has a snap-on mounting for installation on standard profile rails 35 mm (1.4 inch) according to DIN EN The installation position can be chosen at will. The mounting on the DIN rail will be performed by the four straps on the back side of the module. First you push the two straps on the bottom behind the notch of the DIN rail and then you press the module on the DIN rail until the two straps on the top snap in. In order to take the module off the DIN rail slide the module sideward off the rail or in case it is not possible lift the module slightly so that the straps on the top get off the notch and the module can be taken off easily by pulling it off the DIN rail. For CSA-approved installations the modules are intended to be mounted completely inside another enclosure Protective System The sensor modules have an IP20 protective system. If required by the operating site, the modules are to be installed e.g. in a splash-proof or presswater-resistant shell, as known from electrical installation engineering Ambient Temperature The permissible ambient temperature for the Intelligent Sensor Module ISM 112 in operation ranges from -20 C to +60 C. The permissible storage temperature is between -30 C and +85 C. 14 HB_ISM112_E_V221.doc

17 In 1 In 2 In 3 In 4 A B V 0V I/O 1 I/O 2 OUT + OUT - ISM 112 INSTALLATION 3.4. Front of the Appliance / Pin Assignment At the front of the ISM 112 there are the attachment accessories and display elements described in the following figure. 1 2 (1) terminal strip (2) LEDs I/O 1-4 (yellow) B U S SUPPLY DIGITAL ANALOG ISM 112 INTELLIGENT SENSOR MODULE RUN ERR Gantner A N A L O G UFORCE (3) LED RUN (green) (4) LED ERR (red) (6) Module Jack connection 1 Figure 3.1 Front of the appliance terminal meaning terminal meaning A RS485-bus interface A UFORCE force output B RS485-bus interface B In 1 analog input VDC voltage supply + In 2 analog input 2 0 V voltage supply - In 3 analog input 3 I/O 1 digital input/output 1 In 4 analog input 4 I/O 2 digital input/output 2 analog ground OUT + analog output + analog ground OUT - analog output - analog ground Table 3.1 Pin assignment HB_ISM112_E_V221.doc 15

18 In 1 In 2 In 3 In 4 A B V 0V I/O 1 I/O 2 OUT + OUT - ISM 112 INSTALLATION 3.5. Connection Technique connection technique: plug-in terminal screws nominal cross section: 1.5 mm² (0.002 square inch) unifilar/fine-strand (AWG 16) length on which the wire has to be stripped : 6 mm (0.2 inch) The wires are connected with the module by means of terminals. The terminal screws are integrated captively into the terminal strips. All terminal strips are pluggable and can be detached from the module. The best way to take the plugable terminal strips off the module will be performed by assistance of a small screwdriver placed as a lever between terminal strip and module front. Not more than 2 leads should be connected with one clamp. In this case the leads should have the same conductor cross section. For the binding of stranded wire we recommend the use of wire end ferrules. Notice: The connection of the wiring respectively the plug out and plug in of the terminal strip is only allowed in a power free status. Notice: In order to prevent disturbing influences on the sensor signals and the module shielded wires have to be used for the power supply, the bus connection and the signal lines Power Supply U+ U- supply Voltage Range VDC Power Input max. 2.7 W External Protector B U S SUPPLY DIGITAL ANALOG max. 1 A (inert) ISM 112 INTELLIGENT SENSOR MODULE Gantner A N A L O G UFORCE RUN ERR Internal Protector (reversible) protection against excess current excess voltage polarity conversion Figure 3.2 Connection of the distribution voltage 16 HB_ISM112_E_V221.doc

19 INSTALLATION Non-regulated dc voltage between +10 and +30 VDC is sufficient for the power supply of the modules. The input is protected against excess voltage and current and against polarity conversion. The power consumption remains approximately constant over the total voltage range, due to the integrated switching regulator. Due to their low current consumption (max. 150 ma at 10 VDC) the modules can also be remote-fed via longer lines. Several modules can be supplied parallel within the permissible voltage range and considering the voltage drop in the lines. The supply lines can also be installed in one cable, together with the bus line, if required. In order not to charge the distribution voltage of the modules unnecessarily and to avoid unnecessary line troubles, a separate power supply is recommended for sensors with a large current requirement. The distribution voltage for the Intelligent Sensor Modules ISM 112 has to be protected by fuse with 1 A (inert) maximum Grounding The shell of the Ingelligent Sensor Modules ISM 112 has to be connected to earth. For this purpose an M3-thread for attaching an grounding cable is located on the back side of the shell. Back View Earthing Connection Figure 3.3 Grounding Connection at the ISM Lightning Protection If the supply, signal and data lines are installed between several buildings, appropriate protections against lightning must be made, e.g. by: laying the cables in metal tubes which are earthed on both sides laying the cables in concrete cable ducts with fed-through arm using a lightning-protected-wire The lines must be wired with protection elements against excess voltage at the point where they are lead-in into a building, e.g. with varistors or excess voltage conductors filled with rare gas. HB_ISM112_E_V221.doc 17

20 In 1 In 2 In 3 In 4 In 1 In 2 In 3 In 4 A B V 0V I/O 1 I/O 2 OUT + OUT - A B V 0V I/O 1 I/O 2 OUT + OUT - In 1 In 2 In 3 In 4 In 1 In 2 In 3 In 4 A B V 0V I/O 1 I/O 2 OUT + OUT - A B V 0V I/O 1 I/O 2 OUT + OUT - ISM 112 INSTALLATION 3.9. Bus Connection In general the sensor module is connected with the bus by applying the signal leads A and B of the incoming bus cable and A' and B' of the outgoing bus cable together to one terminal on the module (figure 3.4). Alternatively the bus can also be connected by a "stub cable" (figure 3.5). Owing to the removable terminal strip, the bus connection to other modules remains valid, even if one module is replaced by another. Notice: When connecting sensor module with the bus, the two bus interfaces A and B must not be interchanged. Notice: The stub cable should be as short as possible, not longer than 30 cm (12 inch). A B RS 485 bus connection A' B' A B RS 485 bus connection A' B' B U S SUPPLY DIGITAL ANALOG ISM 112 INTELLIGENT SENSOR MODULE RUN ERR Gantner B U S SUPPLY DIGITAL ANALOG UFORCE A N A L O G ISM 112 INTELLIGENT SENSOR MODULE Gantner RUN ERR A N A L O G UFORCE Figure 3.4 Connection of the ISM 112 to the bus A B RS 485 bus connection A' B' A B RS 485 bus connection A' B' B U S SUPPLY DIGITAL ANALOG ISM 112 INTELLIGENT SENSOR MODULE RUN ERR Gantner B U S SUPPLY DIGITAL ANALOG UFORCE A N A L O G ISM 112 INTELLIGENT SENSOR MODULE Gantner RUN ERR A N A L O G UFORCE Figure 3.5 Connection of the ISM 112 to the bus by a stub cable 18 HB_ISM112_E_V221.doc

21 INSTALLATION Sensor Connection The analog and digital signal inputs and outputs are wired according to measurement task, to the transducer (sensor) that is used, and to the number of connected sensors. The pinout arrangements for the various types of measurement will be described in chapter 6. The respectively valid pin assignment is determined by means of the Configuration Software ICP 100. Since the digital outputs are "passive" the process of external elements always requires an external current supply. In case of larger loads this should be independent of the module supply. At the connection of inductive loads a connection with a free wheeling diode is recommended in order to prevent possible disturbances by e.g. induced voltage. To the digital outputs you can connect directly: signal lamps, small relays, switching relays for larger loads, acoustic signal installations, buzzer respectively beeper etc., as long as the connected loads are not exceeding the values described in the technical specifications chapter 10. Notice: Unused analog signal inputs must be connected to analog ground () Several Sensors at one Module Intelligent Sensor Modules ISM can simultaneously take up and process sensor signals from several heterogeneous sensors simultaneously. As many sensors can be connected as there are analog and digital signal inputs and outputs available. With the ISM 111 these are 6 sensors at the most, 4 analog and 2 digital sensors. An overall view of the number of required analog and digital I/Os for the different measuring types is given in the tables 3.2 and 3.3. measuring principles number of required analog inputs single-ended measurement of voltage 1 differential measurement of voltage 2 current measurement 1 RTC 2-wire technique 1 RTC 3-wire technique 2 RTC 4-wire technique 3 resistance bridge in 4-wire technique 2 resistance bridge in 6-wire technique 4 potentiometric measurement 1 thermocouples with ext. compensation 1 thermocouples with int. compensation 1 cold junction for internal compensation 1 analog current output 1 Table 3.2 Number of required analog inputs for the different measuring principles with the Intelligent Sensor Module ISM 112 HB_ISM112_E_V221.doc 19

22 A B V 0V I/O 1 I/O 2 In 1 In 2 In 3 In 4 I/O 3 I/O 4 A B V 0V I/O 1 I/O 2 In 1 In 2 In 3 In 4 I/O 3 I/O 4 In 1 In 2 In 3 In 4 A B V 0V I/O 1 I/O 2 ISM 112 INSTALLATION measuring principles number of required digital I/Os digital status recording 1 digital frequency measurement 1 digital progressive counter 1 digital up/down counter 2 digital quadrature counter 2 digital status output, host-controlled 1 digital status output, process-controlled 1 pulse-width modulated output 1 Table 3.3 Number of required digital I/Os for the different measuring principles with the Intelligent Sensor Module ISM Module Jack ICM 100 The Intelligent Sensor Modules ISM 112 of the line "100" have connection potential on the left and on the right side. Via these the bus and the power supply can be led from one module to the next by means of the Module Jacks ICM 100. This kind of bus connection and of power supply is particularly advantageous if several modules are mounted on one common profile rail side by side. In this case the connection via the terminals can be dropped, except for one module. It is also possible to connect different modules of the line "100" via Module Jacks (e.g. ISM 111 with ISM 111, ISM 112 and IDL 100) Notice: It is necessary to take care of the flow of current at the Module Jack and Sensor Module that it is no higher than permitted. Thus, the power supply preferably should be led to the center of the module line. For the ISM 112 it is the same reason, that it is not allowed to connect more than 6 modules via the Module Jacks ICM 100 in one line. A B U+ U- B U S SUPPLY D I G I T A L ISM 111 INTELLIGENT SENSOR MODULE B U S SUPPLY D I G I T A L ISM 111 INTELLIGENT SENSOR MODULE B U S SUPPLY DIGITAL ISM 110 INTELLIGENT SENSOR MODULE RUN RUN RUN Gantner ERR Gantner ERR Gantner ERR A N A L O G A N A L O G A N A L O G UFORCE UFORCE UFORCE DIN-rail 35 mm (1.4 inch) Module Jack ICM 100 Figure 3.6 Connection of two Sensor Modules ISM 112 and one Sensor Module ISM 111 by Module Jacks ICM HB_ISM112_E_V221.doc

23 In 1 In 2 In 3 In 4 A B V 0V I/O 1 I/O 2 OUT + OUT - ISM 112 INSTALLATION Cold Junction Terminal ICJ 108 At temperature measuring via thermocouples the Intelligent Sensor Module ISM 112 offer the possibility of an internal cold junction compensation. For these purposes a separate terminal strip called ICJ 108 is available. The ICJ 108 must be ordered additionally as a accessory part. At temperature measuring via thermocouples with internal cold junction compensation the terminal strip for the analog inputs simply will be replaced with the cold junction compensation terminal strip ICJ 108, which is colored green instead of the common gray color in order to show the difference. A Pt100-resistance is placed between the terminal In4 and in the ICJ terminal strip. Via the resistance thermometer the Intelligent Sensor Module ISM 112 determines the terminal temperature and executes the cold junction compensation. By assistance of the cold junction compensation ICJ 108 the Intelligent Sensor Module ISM 112 is able to execute at the most three temperature measurements via the internal cold junction compensation. Figure 3.7 Cold Junction Terminal ICJ DC Decoupling The power supply, the bus interface and the analog signal inputs are DC decoupled from each other. This can schematically be described as shown in figure 3.8. A B U+ U- A B U+ U- UFORCE Figure 3.8 DC decoupling at the ISM 112 (schematic) HB_ISM112_E_V221.doc 21

24 STRUCTURE OF THE BUS TOPOLOGY 4. STRUCTURE OF THE BUS TOPOLOGY The coupling of the Intelligent Sensor Modules ISM 112 to a communication bus will be performed over an integrated RS485 interface in the module. The bus topology is characterized by the following features: Bus interface: RS 485, half duplex Bus topology: line pattern, closed at both ends by the characteristic impedance, stub cable to the party max. 30 cm (12 inch). Bus medium: shielded, twisted pair cable Transmission speed: ASCII-protocol: 2400 / 4800 / 9600 / / bps PROFIBUS-protocol: 9.6 / 19.2 / / kbps MODBUS-protocol: 2400 / 4800 / 9600 / / kbps Line length: depends on the transmission speed, max. 1.2 km (0.75 miles) per bus segment, max. 4.8 km (3 miles) via a physical bus string with 3 repeaters Number of bus users: max. 32 bus users per bus segment, max. 127 bus users via a physical bus string Bus interface The bus interface in the sensor modules is an RS485 interface. Its advantages over traditional RS232 connections are a larger number of users, its greater transmission speed, its greater immunity to interfering and the long line length that are mostly required m (3.900 ft) 1000 m (3.250 ft) 100 m (325 ft) 600 m (1.950 ft) RS 422 RS 485 transmission line length RS ,5 K 10 m (32.5 ft) 1 K 10 K 100 K 1 M 10 M transmission speed Figure 4.1 Interrelation between transmission speed and line length [bps] 22 HB_ISM112_E_V221.doc

25 STRUCTURE OF THE BUS TOPOLOGY 4.2. Bus Structure The bus structure is a line structure where each bus segment will be blanked off with characteristic impedance on both ends. Branches can be build up over a bi-directional signal amplifier, so called repeater. Other than that branches are not permitted (no tree topology). The max. stub to a user is not allowed to exceed 30 cm (12 inches). The following figures show a few examples for a possible set-up of bus topologies. The meaning of the symbols is: : bus user : repeater : bus termination.... Figure 4.2 Simple line structure Figure 4.3 Extended line structure... : : : : Figure 4.4 Line structure with branches HB_ISM112_E_V221.doc 23

26 STRUCTURE OF THE BUS TOPOLOGY 4.3. Number of Parties The RS485 interface permits the simultaneous connection and operation respectively of a maximum of 32 bus users per bus segment. Further bus segments can be constituted via bi-directional repeaters, and thus the number of bus users can be raised to max Transmission Speed and Line Length The transmission speed with the Intelligent Sensor Modules can be adjusted between 2,400 bps and kbps. The permissible line lengths depend on the transmission speed. With transmission speeds lower than kbps these line lengths amount to 1,200 m (3,900 feet) per bus segment; with kbps the line length is reduced to 600 m (1,900 feet) per bus segment (specifications according to USA-standard EIA RS422-A). Thus with lower baud rates and with 3 repeaters topologies with a dimension of max. 4.8 km (3 miles) can be set up. transmission line length speed without repeater with 3 repeaters kbps max. 1,200 m (3,900 feet) max. 4.8 km (3 miles) kbps max. 600 m (1,900 feet) max. 2.4 km (1.5 miles) Table 4.1 Interrelation between transmission speed and line length Notice: These specifications refer to bus cables with a conductor cross section of 0.22 mm² and a permissible signal attenuation of max. 6 db referred to the overall length. According to previous experience the line length can be twice as long if a two-wire circuit with a conductor cross section of at least 0.5 mm² is used Bus Cable For setting up a bus topology a shielded twisted pair with at least two leads and the following electric characteristic values must be used: characteristic impedance: Ω at f > 100 khz operating capacity: max. 60 pf/m conductor cross section: min mm² (AWG 24) attenuation: max. 6 db referred to the overall length 24 HB_ISM112_E_V221.doc

27 STRUCTURE OF THE BUS TOPOLOGY 4.6. Bus Plug For installing the bus cable and the bus interface, 9-channel D-subminiature plugs and sockets are used. The pin assignment for the RS485 connection according to PROFIBUS is given in table 4.2. plug pin RS485 notation signal meaning 1 5 DB B / B - C / C - - A / A - Shield RP RxD/TxD-P CNTR-P DGND VP RP RxD/TxD-N CNTR-N Shield, Protective Ground Reserved for Power Receive/Transmit-Data-P Control-P Data Ground Voltage Plus Reserved for Power Receive/Transmit-Data-N Control-N Table 4.2 Pin assignment D-subminiature plug according to PROFIBUS The signal leads A and B (and Shield) are absolutely obligatory for a (shielded) connection. All others can be installed together with these signal leads if required Bus Termination In order to avoid signal reflections on the bus, each bus segment has to be blanked off at its physical beginning and at its end with the characteristic impedance. A terminating resistor R t is installed between the bus leads A and B for this purpose. In addition to that the bus lead A is connected via a pull-up resistor R u to potential (VP) and the bus lead B is connected via a pull-down resistor R d to ground (DataGround). These resistors provide a defined quiescent potential in case there is no data transmission on the bus. This quiescent potential is level high. VP (6) VP = +5V : A (8) B (3) bus cable R R R u t d R u R t R d = 390 Ω ± 2%, at least 1 4 watt = 150 Ω ± 2%, at least 1 4 watt = 390 Ω ± 2%, at least 1 4 watt DGND (5) Figure 4.5 Bus Termination Notice: The figures in parentheses in figure 4.5 indicate the pin number for the connection via the 9-channel D-subminiature plug. HB_ISM112_E_V221.doc 25

28 In 1 In 2 In 3 In 4 A B V 0V I/O 1 I/O 2 OUT + OUT - ISM 112 STRUCTURE OF THE BUS TOPOLOGY The bus termination can be carried out in various ways. It can either be carried out via external resistors and a separate power supply, independent of the module, according to figure 4.5. In this case we recommend to use the indicated resistors for the bus termination. Or the bus termination is connected with the bus users at the beginning and at the end of a bus line. Most of the RS 485 connections for controls, computers, repeaters, interface converters, etc. offer this possibility. Also with the Intelligent Sensor Modules of the 100 series this possibility is given. Via the bus termination plug IBT 100 which is available as accessory and installed at the right port on the front side of the device, the bus termination at this module can be additionally connected. Two jumpers, which connect the bus with the bus termination in the module, are integrated in the bus termination plug. Notice: Instead of the bus termination module IBT 100 separate jumpers can also be used for the bus termination. In this case, please make absolutely sure that the jumper clips are installed as indicated, and that the bus leads or the bus termination are not short-circuited by mistake! R d R t R u A B U+ U- Sensor Module without an additionally connected bus termination B U S SUPPLY DIGITAL ANALOG ISM 112 INTELLIGENT SENSOR MODULE Gantner RUN ERR A N A L O G UFORCE R d R t R u A B U+ U- jumpers Sensor Module with an additionally connected bus termination Figure 4.6 Bus termination at the ISM HB_ISM112_E_V221.doc

29 V 0V I/O 1 I/O 2 OUT + OUT - A B ISM 112 STRUCTURE OF THE BUS TOPOLOGY 4.8. Shielding In case of increased interference we recommend the use of shielded bus cables. Then, a shielding also should be done for the cables from power supply and for the signal cables. There are varying experiences and recommendations concerning the kind of shield connection. In general the shield should be connected with the protective grounding (not DataGround!) at each bus connection. If necessary the shield should be applied additionally several times along the course of the cable. With smaller distances, e.g. with stub cables, the disturbance response often is improved if the shield is only applied to the stub cable exit. Bus parties such as controls (PLCs), computers (PCs), repeaters and interface converters, a.s.o., mostly offer the possibility of applying the shield directly to the appliance or to separate shield rails. The shield rails offer the advantage of preventing possible interfering signals from being led to the appliance via the shield. These are already branched off before via the protective grounding. The Intelligent Sensor Modules ISM 112 do not have a direct shield connection on the device itself. Here the shield of the bus cable can be connected to ground e.g. by so-called shield clamps. Central Earthing Point Braided Shield Isolation RS 485 Bus Connection B U S SUPPLY DIGITAL ANALOG ISM 112 INTELLIGENT SENSOR MODULE Figure 4.7 Grounding of the bus line shield at the ISM 112 Notice: The screen must not be connected with the ground (0V) of the power supply! Notice: The screen should always be connected to earth with a large surface and low-inductive. HB_ISM112_E_V221.doc 27

30 RX TX COM COM A B RECEIVE TRANSMIT POWER V 0V COM' A' B' ISM 112 STRUCTURE OF THE BUS TOPOLOGY 4.9. PC Bus Connection The bus interface of the sensor module is based on the RS 485 standard. Since most of the hosts are "only" equipped with RS 232 interfaces, an interface converter or a plug-in board with RS 485 drivers is required for conversion purposes. Gantner Instruments offers a compact interface converter with integrated mains power supply called ISK 200. Mains power supply, bus connection and a separate 24 VDC-output are dc decoupled. The interface converter is also applicable for remote power feeding. Further more the interface converter ISK 200 offers the opportunity to connect in addition the necessary bus termination with a switcher. The converter is used as a table device. Further more the module IRK 100 is available. This module can be used as a repeater or as a converter. It offers also the opportunity to connect the necessary bus termination with a switch. The Repeater/Converter IRK 100 has a snap-on mounting for installation on standard profile rails (DIN rail) 35 mm (1.4 inch) according to DIN EN ON OFF SUPPLY R S ' ISK100 RS-485 / RS-232 CONVERTER Gantner IRK 100 REPEATER / CONVERTER BUS TERMINATION ON OFF BAUDRATE k Gantner RUN ERR R S R S ON OFF Interface Converter ISK 200 Repeater/Converter IRK 100 Figure 4.8 Interface Converters ISK 200 and IRK Equipotential Bonding The potential difference between the actual physical voltage potentials (that are allocated to a logic signal status) DGND of all connections with the bus must not exceed ± 7 Volt. If this cannot be guaranteed, an equipotential bonding has to be created. For most of the connections this means that the minus connection of the power supply has to be fedthrough as a compensating line from connection to connection. Since the Intelligent Sensor Modules of the "100" series have a power supply that is dc decoupled from the bus, the sensor modules need not be integrated into the equipotential bonding. 28 HB_ISM112_E_V221.doc

31 STRUCTURE OF THE BUS TOPOLOGY Adjustment of Address and Baud Rate Before a control (PLC) or a computer (PC) can interchange data with a sensor module via the bus, address and baud rate for the sensor module have to be defined. The following points have to be taken into consideration in this connection: All devices have to be adjusted to the same baud rate. The same address must not appear twice in the bus topology. The setting variants for the bus parameters for the Intelligent Sensor Modules are: Bus parameters ASCII-protocol PROFIBUS-protocol MODBUS-protocol address ,400 bps - 2,400 bps 4,800 bps - 4,800 bps 9,600 bps 9.6 kbps 9,600 bps baud rate 19,200 bps 19.2 kbps 19,200 bps 38,400 bps - 38,400 bps kbps kbps - Table 4.3 Setting variants for address and baud rate for the Intelligent Sensor Modules If no other specifications are made on delivery, the sensor modules have address 1 and baud rate 19,200 bps as default. The adjustment can be changed via the bus by means of the Configuration Software ICP 100. Adjustment via bus by means of the ISM Configuration Software ICP 100: The condition for adjusting address and baud rate via bus is that there must not be two sensor modules with the same address on the bus. Otherwise the bus connection has to be disconnected or the distribution voltage has to be interrupted for the duration of the adjustment with those sensor modules that have the same address as the module that is to be newly adjusted. The sensor module that is to be newly adjusted does not have to be set to the same baud rate as the PC by way of exception! Please note also our notice below! The adjustment or modification of address and baud rate via bus is always carried out together with the loading of a new sensor program by means of the Configuration Software ICP 100. The download is carried out as described in the short description for the Configuration Software ICP 100. From the LEDs at the front of the sensor modules you can see which sensor module is being newly adjusted at the moment. If the LED ERR changes from "off" to "flash", a new program is just being transmitted to the sensor module. The values are taken over as soon as the data transmission via bus has been successfully completed. HB_ISM112_E_V221.doc 29

32 STRUCTURE OF THE BUS TOPOLOGY Notice: If the sensor module to be adjusted is set to another baud rate than the PC, or if the address given at the download does not correspond to that of the sensor module, but if this address shall be the address of the sensor module in future, the distribution voltage for the sensor module has to be interrupted for a short period before the adjustment. Notice: The address 0 is provided for the PC in case of a transmission via PROFIBUS. This address can therefore not be assigned to the sensor modules. Notice: The address 127 is reserved for broadcast transmission in the PROFIBUS-protocol and may only be assigned for these cases. 30 HB_ISM112_E_V221.doc

33 SIGNAL PROCESSING 5. SIGNAL PROCESSING The Intelligent Sensor Modules ISM 112 has four analog inputs, two digital inputs/outputs, one analog current output and one force-output that is designed as a voltage output. Several different sensors as well as acknowledgements and digital output signals can be connected and processed simultaneously Analog Inputs The analog inputs serve to collect sensor signals, or to acquire control values respectively. They are particularly conceived to measure voltages, currents and resistances. Every single input can be configured in its type of measurement, independent of the others. For the single-ended type of measurement the module has altogether 4 equivalent analog inputs at disposal. Other types of measurement, such as e.g. difference measuring, measuring by resistive bridge, etc. can be realized by using several analog inputs. All analog inputs are protected against excess voltages. Notice: Overloads of more than ±10 VDC will lead to false measuring results in the according analog input variable. Overloads of more than ±15 VDC do also have influence on the measuring accuracy of the other input variables Analog Output The analog output can be used for controlling actors or for regulating purposes. The output is defined as a current output and can be set to one of the following three ranges by means of the Configuration Software ICP100: ma ma variable (max. 22 ma) The analog output will be assigned by a D/A-converter with a resolution of 14 bit. It is DC decoupled from the remaining device by an optocoupler. Notice: When connecting an actor to an analog output it is necessary to take care that this actor does not exceed the maximal burden of 1.2 kω of the output. HB_ISM112_E_V221.doc 31

34 SIGNAL PROCESSING 5.3. Digital Inputs/Outputs The two digital inputs/outputs I/O 1 and I/O 2 of the Intelligent Sensor Modules ISM 112 can be configured - independent from each other - as inputs or as outputs. The current status (in/out) is signalized by one LED each. As inputs the I/Os can be used for collecting acknowledgements, for measuring frequencies or for counting. Status information or pulse-width modulated digital signals can be issued by the outputs. The inputs have an excess voltage protection (transil diodes), which comes into action at approx. 33 V. The maximum permissible input voltage amounts to 30 V. Input voltages between 3.5 VDC and 30 VDC are interpreted as logic LOW ("0"), input voltages lower than 1.0 V as logic HIGH ("1"). The maximum fan-in current amounts to 1.5 ma. signal level logic level + 3,5 V high low (0) + 1,0 V 0 V low high (1) Figure 5.1 Definition of signal levels and logic levels The outputs are open-collector outputs with a maximum voltage of 30 VDC and a maximum fan-out current of 100 ma. The outputs are internally connected to the power supply potential ( VDC) via a 22 kω pull-up resistor. VP VP 22 k Figure 5.2 Internal pull-up resistor at the digital I/Os 32 HB_ISM112_E_V221.doc

35 SIGNAL PROCESSING 5.4. Voltage Output (U FORCE ) An integrated supply point of 5 VDC / 2% supplies resistors or sensors based on resistance variations respectively with up to 50 ma. With the resistance measuring the voltage output is connected internally in 2-, 3- and 4-wire technique with the analog signal input belonging to the measurement variable, so that the exact voltage is also measured by the module Internal Reference Voltage An internal reference voltage serves to adjust the entire analog signal processing automatically Internal Processing The analog multiplexer at the input of the circuit collects the voltage at the voltage output as well as the internal reference voltage, beside collecting the analog input signals. All these values are then transmitted to the programmable amplifier PGA, where the signals are amplified according to the kind and type of the connected sensors and are then supplied to the A/D converter. The A/D converter digitizes all incoming signals with a definition of 16 bit and at a rate that can be preset for the module by the user (see section 5.7). Analog multiplexer and A/D converter are controlled by a separate processor µp2. The Sigma-Delta-procedure used for the A/D-conversion guarantees a high accuracy and a high linearization. The A/Dconverter processes an integrated amplifier with the amplifier stages of 1, 2, 4, 8, 16, 32 and 64. For very small signals, the module switches to an additional amplifier with amplifier stages of 100, 200, 400, 800 and The amplification in alignment with the accuracy and resolution of the calculated measuring values does resolve from the selection of the measuring range which will be configured by assistance of the Configuration Software ICP100. The microprocessor µp1 is DC decoupled from the analog part. First of all this microprocessor further edits the measuring signal on hand in digital form. First there is the option of having the processor carry out a signal filtering or an arithmetic averaging of the measuring signal (see section 5.8). The user can preset this by configuring the sensor module accordingly. Subsequently the processor linearizes and scales the signal and holds it ready for transmission via bus into programmable units. In addition to that the processor monitors the measured value as to freely configurable limiting values. Thus a monitoring as to breaking of the sensing element or short circuit can also be realized easily. So the sensor module can be occasioned - by means of appropriate configuration - to provide a corresponding signal at the digital I/O in case of alarm. The digital I/Os are directly addressed and monitored respectively by the microprocessor µp1. The special user program, the data for configuration, linearization and scaling etc. that are required by the processor µp1 for the execution of its tasks all are retentively deposited in a Flash EPROM. HB_ISM112_E_V221.doc 33

36 In 1 In 2 In 3 In 4 Analog Multiplexer PGA Voltage Regulator A/D Conv. Voltage Reference µp 2 IR LED Optic Interface Flash EPROM µp 1 (Main Proc.) Figure 5.3 Block diagram ISM 112 Optic IF Optic IF Analog Out Analog In RS 485 Digital Optic IF Digital I/O RS-485 IF D/A Conv. A B V 0 V I/O 1 I/O 2 OUT + OUT - ISM 112 SIGNAL PROCESSING = U FORCE A GND A GND A GND 34 HB_ISM112_E_V221.doc

37 SIGNAL PROCESSING 5.7. Measurement Rate The A/D-converter digitizes every signal at a rate that can be preset by the user. Currently the setting variants range from 50Hz to 200Hz. The filtering periods of the A/D-converters with one measurement variable and one measurement per variable thus range from 20 ms (adjusted measurement rate 50Hz) to 5 ms (adjusted measurement rate 200Hz). If several analog measurement variables are used or several measurements per variable are carried out, the measurement rate from one measured value to the next is reduced by the factor of 5, due to the change-over of the A/Dconverter. Thus for one measuring cycle over all measured values the following durations result: number of variables duration for one measuring cycle at a meas. rate of resp. measurements 50 Hz 200 Hz 1 20 ms 5 ms ms 50 ms ms 75 ms ms 100 ms Table 5.1 Duration required for one measuring cycle with varying number of measurement variables or measurements respectively with ISM 112 Notice: With resistance measurings in 3-wire technique 2 measuring procedures are required. The duration for one measuring cycle in this case amounts to 200 ms with one measurement variable and a measurement rate of 50 Hz. Notice: Digital measurements have only a small influence on the measurement rate and can be neglected in this context Signal Preparation The great amplification of signals required with small signals naturally also entails a higher photoelectric noise level. Two methods for signal preparing serve to increase the measuring accuracy. They can be connected and configured separately for each measurement variable by the user. Filtering: The first method for signal preparing is a low-pass filter. It ensures that only the low-frequency shares of the signals are evaluated. Higher-frequency photoelectric noise levels are not taken into account. The low-pass filter is particularly suitable for noise cancellation with slowly changing signal forms (quasi-stationary processes). The time constant (filter settling time) of the low-pass filter can be selected between 1 and 1000 seconds. The time constant should be at least 1/f max where f max is the highest occurring disturbance frequency. Averaging: The second method for signal preparing is realized by an arithmetic averaging over several measured values. Thus the reading rate is decreased, but the definition is considerably increased. The duration of averaging and the number of averaging can freely be selected in the range between 1 and HB_ISM112_E_V221.doc 35

38 FUNCTIONAL DESCRIPTION 6. FUNCTIONAL DESCRIPTION The Intelligent Sensor Modules ISM 112 have altogether 16 logical variables (in Profibus-DP protocol 12 variables only) for the collection, processing and output of various kinds of sensor information. These 16/12 variables can be configured as: Analog Input Variable Analog Output Variable Digital Input Variable Digital Output Variable Arithmetic Variable Setpoint Variable Alarm Variable Controller Variable For each variable various kinds of variable information and processing functions can be determined. The table in appendix C gives a survey of the variable set-ups with ISM 112. The variable set-ups are carried out by means of the Configuration Software ICP Analog Input Variable The Analog Input Variable collects and processes the signals of the most common transducers. Currently a large number of standardized and proprietary sensors are deposited in the sensor module. The user can input further sensors. Only a few principles of measurement form the basis of the acquisition of the varying quantities to be measured with these sensors. These are: Measurement of voltage Measurement of current Measurement of resistance Measuring by a resistance bridge Potentiometric measurement Measurement of temperature with thermocouples For each of these measurements the Intelligent Sensor Module ISM offers several types of measurement. For measurements of voltage the types of measurement single-ended and differential can be used. Currents up to 25 ma are directly measured by the sensor module. Current measurements of more than 25 ma can be carried out by measuring the fall of potential at an external shunt. Resistance measuring can be carried out in 2-, 3- and 4-wire technique, measuring by resistance bridges in 4- and 6-wire technique. In addition to that there is the possibility of potentiometric measurements. When measuring temperature with thermocouples the user can choose between an internal or an external cold junction compensation. Subsequently the individual types of measurement will be described in detail. 36 HB_ISM112_E_V221.doc

39 FUNCTIONAL DESCRIPTION Measurement of Voltage: Connection Scheme Circuit A N A L O G In 1 + U = - U1 = measuring voltage U U = U1 Figure 6.1 Measurement of voltage - single-ended Connection Scheme Circuit In 1 A N A L O G U2 = U1 = + U1 = - + U2 = - In 2 U1-U2 measuring voltage U1 and U2 U = U1 - U2 Figure 6.2 Measurement of voltage - differential Two types of measurement are available for measurement of voltage with the Intelligent Sensor Module ISM 112: single-ended and differential measurement. With the single-ended type of measurement the voltage to be measured is injected between an analog input (In 1...4) and analog ground (). Differential measurements are realized by using two analog inputs. The measuring range lies between 0 and ±10 V. Notice: With differential measurements both voltages have to be within 10 V referred to A GND (Common-Mode-Range). HB_ISM112_E_V221.doc 37

40 FUNCTIONAL DESCRIPTION Measurement of Current: Connection Scheme Circuit A N A L O G In 1 I Rint U1 measuring current I I = U1 / Rint Figure 6.3 Measurement of current with internal shunt Connection Scheme Circuit A N A L O G In 1 I Rext U1 Rext external shunt measuring current I I = U1 / Rext Figure 6.4 Measurement of current with external shunt For measurement of current with the Intelligent Sensor Module ISM 112 the source of electricity is connected between an analog input (In 1...4) and analog ground (A GND ). The load on the source of electricity that is required for the measuring is regulated by an internal resistor R int to the amount of 100Ω. The capacity of this shunt is limited with 125 mw maximum. This results in a measuring range of up to 25 ma maximum. The measuring of stronger currents is possible by means of an external resistor which is connected parallel to the source of electricity with the analog signal input and analog ground (A GND ). The capacity of this external shunt has to be adapted to the source of electricity to be measured, so that the voltage occurring at the analog input does not exceed +10 V. The analog input is configured as voltage input. The voltage has to be divided by R ext. Notice: The precision of the current measurement with external shunt depends on the precision of the resistor that is used. 38 HB_ISM112_E_V221.doc

41 FUNCTIONAL DESCRIPTION Measurement of Resistance: Connection Scheme Circuit A N A L O G RL In 1 R0 Rx U1 + U - RL Rx measuring resistance Rx = U1/U0 * R0, Rx = 2*RL Figure 6.5 Measurement of resistance in 2-wire technique Connection Scheme Circuit RL In 1 R0 A N A L O G Rx In 2 U1 U2 + U - Rx RL measuring resistance Rx = (U1/U0-2*U2/U0) * R0, Rx = 0 Figure 6.6 Measurement of resistance in 3-wire technique Connection Scheme Circuit RL In 1 R0 A N A L O G Rx In 2 In 3 U2-U3 + U - Rx RL measuring resistance Rx = (U2-U3)/U0 * R0, Rx = 0 Figure 6.7 Measurement of resistance in 4-wire technique HB_ISM112_E_V221.doc 39

42 FUNCTIONAL DESCRIPTION Resistance measuring are carried out by means of measurements of voltages at a current-carrying resistor. In this case the occurring fall of potential is measured via the resistance sensor. The feed current required for the resistance measuring provides the internal supply of the module. For this purpose the sensor module connects a supply point internally with the analog measurement input via a reference resistor R o. The fall of potential U o via the resistor R o is required as a reference for further signal processing by the module. The value of resistance of the sensor can be calculated from the input signals U i as a multiple of the reference resistor R o. The measuring range amounts to between 0 and 20 kω. Notice: The Intelligent Sensor Module ISM 112 supports resistance measuring in 2-, 3- and 4-wire technique. With resistance measuring in 2-wire technique the supply lines cause an additional fall of potential, thus distorting the measuring result and influencing the measuring accuracy. Therefore it is necessary to pay attention especially with resistance measuring in 2-wire-technique to use as low-impedance leads as possible to the sensors and to make sure that the leads are well-connected with the sensor module and the sensor. With resistance measuring in 3-wire technique the fall of potential via the supply lines is eliminated from the measuring result (-2 U 2 /U 0 R 0 ). In this case 2 measuring are required (for U 1 /U 0 and U 2 /U 0 ). Thus twice the original measuring time is required. With resistance measuring in 4-wire technique the fall of potential is picked up directly at the sensor, so that the measuring results are not influenced by the supply lines any longer. 40 HB_ISM112_E_V221.doc

43 FUNCTIONAL DESCRIPTION Measuring by a Resistance Bridge: Connection Scheme Circuit A N A L O G RL UFORCE UZ In 1 In 2 + U - RL UB UB UZ = U1 - U2 UFORCE Figure 6.8 Measuring by a resistance bridge in 4-wire technique Connection Scheme Circuit RL UFORCE A N A L O G In 1 UZ In 2 In 3 + U - In 4 UB RL UB UZ = U2 - U3 U1 - U4 Figure 6.9 Measuring by a resistance bridge in 6-wire technique Bridge connections consist of 2 arms with two resistors each. The resistance bridge is supplied by the voltage output U Force at the sensor module. The quantity to be measured with resistance bridges is the relation between bridge voltage U B and fall of potential via the two resistance arms U Z (ratio measurement). The measuring range amounts to between 0 and 1 V/V. HB_ISM112_E_V221.doc 41

44 FUNCTIONAL DESCRIPTION Mostly there are two fixed and one controllable resistors in resistance bridges, so that the resistance bridge can easily be aligned via the controllable resistor (U B =0 for the ground level state). Variations of the sensor signal characteristically influence the fourth resistor and cause a change in the quantity to be measured. Notice: The Intelligent Sensor Module ISM 112 supports measuring by resistance bridges in 4- and 6-wire technique. When measuring in 4-wire technique the supply lines cause an additional fall of potential, which leads to a slight diminishing of the bridge voltage. This distorts the measuring result and thus influences the measuring accuracy. Therefore it is necessary to pay attention specially with bridge measuring in 4-wire-technique to use as low-impedance leads as possible to the sensors and to make sure that the leads are well-connected with the sensor module and the sensor. When measuring by resistance bridges in 6-wire technique the fall of potential is collected directly at the sensor, so that the supply lines do not influence the measuring result any longer. Potentiometric Measurement: Connection Scheme Circuit RL UFORCE A N A L O G Rg Re In 1 U1 + U - RL Rg Re Re/Rg = U1/UF, (Re/Rg) < RL/Rg Figure 6.10 Potentiometric measurement Potentiometric measurements are measurements with voltage distributors, the division ratio of which can be adjusted (e.g. by a sliding contact on a resistance regulator). The quantity to be measured is the relation between the adjusted resistance R e and the combined resistance R g of such a potentiometer (ratio measurement). With the Intelligent Sensor Module ISM 112 the potentiometer is supplied by the voltage output U FORCE on the module. The signal is picked up at the resistor. Notice: With potentiometric measurements the supply lines cause an additional fall of potential, which can lead to a slight decrease in signal voltage, thus distorting the measuring result and influencing the measuring accuracy. Therefore it is necessary to pay attention with potentiometric measuring to use as low-impedance leads as possible to the sensors and to make sure that the leads are well-connected with the sensor module and the sensor. 42 HB_ISM112_E_V221.doc

45 FUNCTIONAL DESCRIPTION Measurement of Temperature with Thermocouples: Connection Scheme Circuit In 1 A N A L O G U1 ϑ ϑ K In 4 U4 R0 + U - ICJ 101 ϑ -1 ϑ = Lin ( U1 + Lin ϑ k ) ϑ k= Lin ( U4 ) Figure 6.11 Measurement of temperature with internal cold junction compensation by the terminal clamp ICJ 108 Connection Scheme Circuit In 1 A N A L O G ϑ ϑr U1 ϑ ϑr -1 ϑ = Lin ( U1 + Lin ϑ r ) Figure 6.12 Measurement of temperature with external cold junction compensation Thermocouples consist of two "thermoelectric wires" made of different materials (e.g. platinum and platinum rhodium) that are welded to each other at one end. If the contact position and the other ends of the thermoelectric wires have different temperatures, a "thermoelectric voltage" U th appears at the contact position of both thermoelectric wires. This voltage is largely proportional to the temperature difference. It can be measured and can be used for temperature measurement purposes. With the Intelligent Sensor Module ISM 112 the thermocouple is connected to an analog input and to the analog ground for this purpose. HB_ISM112_E_V221.doc 43

46 FUNCTIONAL DESCRIPTION Since thermocouples can only measure a temperature difference (difference between temperature to be measured and temperature at the connecting terminals on the sensor module), a terminal temperature or a known temperature reference also have to be determined. In the first case this is called internal cold junction compensation (TC int ), in the second case external cold junction compensation (TC ext ). At the measuring of temperature with internal cold junction compensation at an additional analog input a temperature sensor will be connected next to the thermocouple. Or by means of cold junction terminals ICJ 108, where a Pt100 temperature sensor is integrated directly in the terminal bloc between the terminal connections In4 and A GND, the temperature ϑ k will be entered. Than the analog input In4 is not available for further measurements. The temperature of the test point determines the sensor module because of linearization trace to ϑ x = Lin(U x +Lin -1 ϑ k ), where ϑk = Lin (U4). The sensor module will be informed about the measuring variable through which the temperature of terminals can be calculated via the Configuration Software ICP 100 (cold junction variable). If the temperature is measured by external cold junction compensation, a second thermocouple of the same type is required, which is connected in series with the first one. The polarity is selected so that the thermoelectric voltages subtract each other. The second thermocouple is set to a fixed reference temperature ϑ r (mostly ϑ r = 0 C). The sensor module then calculates the temperature at the measuring position by means of the linearization curve as ϑ x = Lin(U x +Lin -1 ϑ r ). The sensor module will be informed about the reference temperature ϑ r via the Configuration Software ICP 100 ("cold junction temperature"). 44 HB_ISM112_E_V221.doc

47 A B V 0V I/O 1 I/O 2 OUT + OUT - ISM 112 FUNCTIONAL DESCRIPTION 6.2. Analog Output Variable The Analog Output Variable has the function of a current output. The limit values for the current range can be set between 0 and 22 ma by means of the Configuration Program ICP100. Via the analog output (OUT+, OUT-) at the Intelligent Sensor Module ISM 112 actual measuring values or sensor variables can be output depending on the configuration. Thus for example it is possible to assign the value of a Setpoint Variable or the result of an Arithmetic Variable to the Analog Output Variable and to output them as analog set values. Another possibility for using the Analog Output Variable is given in connection with the controller function of the ISM 112. Therefore an input signal is being compared with a defined set value by using a Controller Variable. At a deviation of the input signal from the set value the controller will calculate a corresponding controlling value and will assign this value to the analog output. By means of a corresponding connection of the output the deviation can be corrected. Analog Signal Output: Connection Scheme Circuit M OUT+ OUT- OUT- OUT+ M B U S SUPPLY DIGITAL ANALOG Figure 6.13 Analog Signal Output With the analog signal output the value, which is assigned to the Analog Output Variable will be output as a current value. Thus the lowest defined value corresponds to the lower limit value of the measuring range (> 0 ma) and the highest defined value corresponds to the upper limit value of the measuring range (max. 30 ma). The values between these two points will be calculated by the Intelligent Sensor Module ISM 112 based on a linear characteristic. The actualizing rate of the output value decreases with an increasing number of defined variables where as the swing-in rate of the output will be 10 ms. HB_ISM112_E_V221.doc 45

48 A B V 0V I/O 1 I/O 2 I/O 3 I/O 4 ISM 112 FUNCTIONAL DESCRIPTION 6.3. Digital Input Variable The following functions can be realized by means of the Digital Input Variable: Digital status recording Frequency measurement Progressive counter Up/down counter Quadrature counter The above mentioned functions are based on incremental measuring except the digital status recording. Incremental measuring means to count while measuring. You can count pulses which are released by e.g. angle coders. For the ISM 112 the maximum counting rate is 25 khz. The incremental measuring system is used with priority with quantity measurements, displacement measurements and revolution counts in the most varying fields of application. Digital Status Recording: Connection Scheme Circuit VDC 0 V I/O 1 I/O 1 B U S SUPPLY D I G I T A L 0 V Figure 6.14 Digital status recording signal diagram: I/O 1 status "0" "1" "0" "1" For the acquisition of digital status information (on/off, closed/open, left/right, etc.) the signal applied at the digital input is collected and is held ready for further processing in the Intelligent Sensor Module ISM 112 or for transmission via bus. The digital input is set (switch closed) as long as the applied signal voltage remains under the threshold value of 1.0 V. The digital information can be scanned as 1/0 information via bus. 46 HB_ISM112_E_V221.doc

49 A B V 0V I/O 1 I/O 2 I/O 3 I/O 4 ISM 112 FUNCTIONAL DESCRIPTION Frequency Measurement: Connection Scheme Circuit f VDC 0 V I/O 1 I/O 1 f B U S SUPPLY D I G I T A L 0 V Figure 6.15 Frequency measurement Signal Diagram: I/O 1 Time Base ZB ZB ZB Counting Pulse Measurand (TB = 5 sec) ,6 Hz 0,6 Hz 0,6 Hz With frequency measurements the sensor module counts the pulses occurring in a particular time interval at the digital input. The user can preset this time interval by signalizing the time base (TB) in the range between 0.1 sec and 10 sec. The frequency is calculated by the sensor module from the number of impulses and the time base TB as: frequency f = number of impulses per time interval TB length of time intervall TB Hz With frequency measurements it is always the negative signal edge (1 -> 0) that is counted at the digital signal input. Notice: The high-end frequency for the frequency measurement is 25 khz. HB_ISM112_E_V221.doc 47

50 FUNCTIONAL DESCRIPTION Determination of the Time Base The lower the frequency f, the larger is the interval between two pulses, and the larger the time base TB has to be. On the other hand the updating of the measured value decreases with an increasing time base. Thus the time base should be selected so as to make TB 1/f u, f u being the lowest frequency or the smallest change in frequency respectively that still is to be determined by the sensor module. The error with frequency measurements thus amounts to f = f u = 1/TB. Example: lowest frequency or frequency change to be measured: f u = 0.1 Hz TB 1/f u = 10 s lowest frequency or frequency change to be measured: f u = 100 Hz ZB 1/f u = 0.1 s 48 HB_ISM112_E_V221.doc

51 A B V 0V I/O 1 I/O 2 I/O 3 I/O 4 ISM 112 FUNCTIONAL DESCRIPTION Progressive Counter: Connection Scheme Circuit VDC 0 V I/O 1 I/O 1 B U S SUPPLY D I G I T A L 0 V Figure 6.16 Progressive counter signal diagram: I/O 1 counting pulse counting measurand n+1 n+2 n+3 n+4 n+5 When configuring a digital input as a progressive counter the Intelligent Sensor Module ISM 112 constantly monitors the digital input for a signal variation. If a negative signal edge (1 -> 0) occurs at the input, the current result is increased by 1. The range of values of the counter depends on the defined transmission protocol (table 6.2). The values can be reset to zero via the bus, via the remaining second digital input or via every other variable. protocol counter range of values ASCII ±31 bit ( -2, ,1 Billion) PROFIBUS ±31 bit ( -2, ,1 Billion) MODBUS ±15 bit ( ) Table 6.1 Range of values for the progressive counter Notice: The maximum counting rate for the progressive counter is 25 khz. Notice: After a voltage cut-off all counters are reset to zero. HB_ISM112_E_V221.doc 49

52 A B V 0V I/O 1 I/O 2 I/O 3 I/O 4 ISM 112 FUNCTIONAL DESCRIPTION Up/Down Counter: Connection Scheme Circuit VDC 0 V I/O 1 I/O 2 I/O 1 0 V I/O 2 B U S SUPPLY D I G I T A L VDC Figure 6.17 Up/Down counter signal diagram: I/O 1 I/O 2 counting pulse counting measurand n+1 n+2 n+3 n+2 n+3 When configuring a digital input as a counter for counting up and counting down, the Intelligent Sensor Module ISM 112 constantly monitors the digital inputs I/O 1 and I/O 2 for a signal variation. If a negative signal edge (1 -> 0) occurs at the input I/O 1, the current result is increased by 1 (signal level I/O 2 = 0) or decreased by 1 (signal level I/O 2 = 1), according to the status of the second digital input. The range of values of the counter depends on the defined transmission protocol (table 6.3). The values can be reset to zero via the bus via every other variable. protocol counter range of values ASCII ±31 bit ( -2, ,1 Billion) PROFIBUS ±31 bit ( -2, ,1 Billion) MODBUS ±15 bit ( ) Table 6.2 Range of values for the up/down counter Notice: For the up/down counter both digital inputs of the ISM 112 are required. Notice: The maximum counting rate for the up/down counter is 25 khz. Notice: After a voltage cut-off all counters are reset to zero. 50 HB_ISM112_E_V221.doc

53 A B V 0V I/O 1 I/O 2 I/O 3 I/O 4 ISM 112 FUNCTIONAL DESCRIPTION Quadrature Counter: Connection Scheme Circuit VDC 0 V I/O 1 I/O 2 I/O 1 0 V I/O 2 B U S SUPPLY D I G I T A L VDC Figure 6.18 Quadrature counter signal diagram: change of the counting direction I/O 1 I/O 2 counting pulse counting measurand n+1 n+2 n+3 n+4 n+5 n+6 n+5 n+4 n+3 n+2 When configuring the digital inputs as a quadrature counter, the Intelligent Sensor Module ISM 112 constantly monitors the digital inputs I/O 1 and I/O 2 for a signal variation (0 -> 1 and 1 -> 0). If I/O 1 and I/O 2 have equal (different) signal levels and there appears a signal change at the input I/O 1 the actual counting measured will be increased (decreased) by 1. Vice versa to the progressive counter and the up/down counter both signal edges will be evaluated at the digital input I/O 1 at the quadrature counter. HB_ISM112_E_V221.doc 51

54 FUNCTIONAL DESCRIPTION The range of values of the counter depends on the defined transmission protocol (table 6.4). The values can be reset to zero via the bus via every other variable. protocol counter range of values ASCII ±31 bit ( -2, ,1 Billion) PROFIBUS ±31 bit ( -2, ,1 Billion) MODBUS ±15 bit ( ) Table 6.3 Range of values for the quadrature counter Notice: For the quadrature counter both digital inputs of the ISM 112 are required. Notice: The maximum counting rate for the quadrature counter is 25 khz. Notice: After a voltage cut-off all counters are reset to zero Digital Output Variable The Digital Output Variable supports: digital status output, host-controlled digital status output, process-controlled pulse-width modulated signal output (PWM) Via the digital inputs/outputs on the Intelligent Sensor Module ISM 112 digital status information or measured quantities and sensor variables respectively can be output in digital form, according to the configuration. Digital status information can be withdrawn from the process (Process Out). A typical case of application would be e.g. the local output of an acoustic or optical signal in case a limiting value is exceeded or undershot by a measured value. Or the digital outputs may be set from the host computer by bus (Host Out). For analog regulated quantities measured values or sensor variables in general can also be output as pulse-width modulated signal (PWM) by the digital output. The time base respectively the frequency with that the pulse-width modulated signal output will be set, can be configured by the user by assistance of the Configuration Software ICP 100. Therefore the settings 10ms, 1s and 10s are possible without depending on the functions of the remaining I/Os. 52 HB_ISM112_E_V221.doc

55 FUNCTIONAL DESCRIPTION Digital Status Output, Host-Controlled: Connection Scheme Circuit U+ I/O 1 U+ B U S SUPPLY D I G I T A L I/O 1 Figure 6.19 Digital status output, host-controlled signal diagram: I/O 1 status "0" "1" "0" "1" With the host-controlled digital status output, the digital output is set according to the status information received by the sensor module via bus. The distribution voltage can range from 10 to 30 VDC. It has to be either supplied externally or be picked up by the power supply of the sensor modules. The status of the digital output can be scanned as 1/0 information via bus. HB_ISM112_E_V221.doc 53

56 A B V 0V I/O 1 I/O 2 I/O 3 I/O 4 ISM 112 FUNCTIONAL DESCRIPTION Digital Status Output, Process-Controlled: connection scheme circuit U+ I/O 1 U+ B U S SUPPLY D I G I T A L I/O 1 Figure 6.20 Digital status output, process-controlled signal diagram: I/O 1 status "0" "1" "0" "1" With the process-controlled output of status information the sensor module monitors measured values, resp. sensor variables as to constraints (threshold values). The digital output is set if one or several threshold conditions are fulfilled. The user can freely define the constraints. The user can also preset the logical signal level (see also the Configuration Software ICP 100). The distribution voltage can amount from 10 up to 30 VDC. It has to be supplied externally or picked up by the power supply of the sensor module. The status of the digital output can be scanned as 1/0 information via bus. 54 HB_ISM112_E_V221.doc

57 A B V 0V I/O 1 I/O 2 I/O 3 I/O 4 ISM 112 FUNCTIONAL DESCRIPTION Pulse-Width Modulated Signal Output (PWM): connection scheme circuit P W M U+ I/O 1 U+ P W M B U S SUPPLY D I G I T A L I/O 1 Figure 6.21 Pulse-width modulated signal output (PWM) signal diagram: - high measuring value: I/O 1 time base TB TB TB TB logic level H L H L H L H L PW = high/low = 66% - low measuring value: I/O 1 time base TB TB TB TB logic level H L H L H L H L H PW = high/low = 33% Measured values, or sensor variables in general, can be output by the digital output as a pulse-width modulated signal (PWM). With this procedure the pulse-width PW displays linear variation with the measured value between 0% (minimum capacity A) and 100% (maximum capacity B): measured value = A + ( B - A ) PW Here the pulse-width PW is the ratio - averaged out over a period - between log. level High and log. level Low. The user determines the frequency at which impulses are output at the digital signal output by defining the time base TB. The setting variants are 10 msec, 1 sec and 10 sec for the PWM signal output via I/O1 and I/O 2 respectively. The voltage can be between 10 and 30 VDC. It has to be supplied externally or be picked up by the power supply of the sensor module. HB_ISM112_E_V221.doc 55

58 FUNCTIONAL DESCRIPTION 6.5. Arithmetic Channel By means of the Arithmetic Variables sensor variables and constants can be connected with each other via arithmetic operations. The result is allocated to the Arithmetic Variable. The formula can contain up to 20 operands. The calculation will be performed with a stack depth of 4. The value is handled as a 4-byte floating point format with 24 significant bits according to IEEE, standard 754. The full scale is to Arithmetic operations overview: operator sign ISM 111 ISM 112 time addition + X X 0.80 ms subtraction - X X 0.80 ms multiplication * X X 0.80 ms division / X X 1.10 ms square root sqrt X X 2.68 ms exponential function to base e exp X X 3.92 ms absolute value abs X X 0.10 ms logarithm to base e ln X X 3.70 ms logarithm to base 10 log X X 3.80 ms integrator integ X X 0.10 ms differentiator deriv X X ms sine sin X X 3.20 ms cosine cos X X 3.60 ms tangent tan X X 3.60 ms reverse function for sine arcsin X X 3.20 ms reverse function for cosine arccos X X 7.00 ms reverse function for tangent arctan X X 3.20 ms minimum value ( pull-pointer ) min X X 0.10 ms maximum value ( pull-pointer ) max X X 0.10 ms lowest value low X X 1.40 ms highest value high X X 1.40 ms Table 6.4 Arithmetic operators and the calculation times Notice: The calculation time of an Arithmetic Variable is 0.6 ms. The overall calculation time is the sum of the times of all operands in the formula plus 0.6 ms. Remarks: Division (/) When dividing by zero, the positive full scale will be assigned to the Arithmetic Variable if the numerator is positive and the negative full scale will be assigned if the numerator is negative. Square Root (sqrt) The square root of a negative number is zero. 56 HB_ISM112_E_V221.doc

59 FUNCTIONAL DESCRIPTION Logarithm to Base e (ln) This function determines the natural logarithm of a value to the base of e ( 2,71828). For a value 0 the negative full scale will be assigned to the Arithmetic Variable. Logarithm to Base 10 (log) This function determines the logarithm of a value to the base of 10. For a value 0 the negative full scale will be assigned to the Arithmetic Variable. Integrator (integ) With this function the value of a variable will continuously be integrated, i.e. the value indicated after this function will be added to the value of the Arithmetic Variable every second. The result value can be reset to the actual value of the measured variable via the bus via a digital input or via every other variable. Writing any value to the integrator register resets it. Differentiator (deriv) With this function a variable will be differentiated by time. The differential quotient will be created every second. Arc Functions (sin, cos, tan) The arc values must be taken in radians (2π = 360 ). If calculating the tangent, the positive full scale will be assigned to the Arithmetic Variable for the arc value π/2 and the negative full scale for the arc value -π/2. Reverse Functions for sin (arcsin), cos (arccos) und tan (arctan) The results of the reverse functions are given in radians (2π = 360 ). At the function arcsin the value π/2 will be assigned to the Arithmetic Variable for a value > 1 and the value -π/2 will be assigned for a value < -1. At the function arcos the value 0 will be assigned to the Arithmetic Variable for a value > 1 and the value -π will be assigned for a value < -1. Minimum and Maximum of a Variable Value (min, max) With this function the minimal and maximal value of a variable appeared since the last reset has been triggered off can be determined ("pull-pointer function"). The result value can be reset to the actual value of the measured variable via the bus or via a digital input or via every other variable. Lowest and Highest Value of Several Operands (low, high) With this function up to four sensor variables can be compared with each other and the lowest or highest value respectively can be determined. Pull-Pointer Function: The pull-pointer function can for example be realized with analog measuring instruments. Thus the pointer of the measuring instrument pushes a second pointer in front of it. This second pointer cannot swing back by itself, but will remain on the place of the maximal value. Only after pressing a reset key the pull-pointer will be set back to the original value of the measuring pointer. With the ISM 112 this function can be realized with the functions min and max. Thus the Arithmetic Variable has the function of the pull-pointer. With the reset settings the desired type of reset can be selected. Notice: In order to prevent an effect of disturbances of the sensor signals on the functions min, max, low and high of the Arithmetic Variable a filter should be added to the measuring variables integrated in the formula. HB_ISM112_E_V221.doc 57

60 FUNCTIONAL DESCRIPTION Notice: Logic combinations, e.g. if-then relations, are not possible at the moment or require a customer or user-specific download-program respectively. A typical application for the Arithmetic Variable is e.g. the determination of a value that cannot be measured directly, but which can be calculated from other values (e.g. power as the product of voltage and current). Or the Arithmetic Variable is used for further mathematic preparation of a measuring signal, in order to obtain a particular desired display format Setpoint Variable This channel offers the possibility of transmitting values via bus to the sensor module. The values are allocated to the Setpoint Variable and are thus at the disposal of the sensor module for further processing. A typical application for the Setpoint Channel is e.g. the dynamic variation of supervision thresholds Alarm Variable The Alarm Variable has the same features as the process-controlled Digital Output Variable, the only difference being that the status information is not output locally at the digital output, but can only be scanned via the bus Controller Variable With the Controller Variable a sensor variable can be monitored for a definable set value. Deviations of the sensor variable s value will be corrected depending on the set function of the controller and will then be assigned to the Controller Variable. This corrected value can be assigned to a digital PWM signal output and then be used to influence the input signal by a corresponding connection of the output. The controller has the function of a PID-controller. He can be configured by means of the Configuration Software ICP 100. Therefore a value for the proportional, the integral and the differential part must be entered. It is also possible to switch off a part by entering the value "0" where as PI and PD controllers are also possible Threshold Values The user can preset the conditions for process-controlled digital status output on the module and for the output of an alarm signal via bus. This is carried out by means of the Configuration Software ICP Error Handling The Intelligent Sensor Modules ISM 112 can independently detect certain defects, which are consequence of a line break, short circuit, or communication interrupt for example. For these defects the user can preset a certain behavior for the module via the Configuration Software ICP 100. As a standard the current status of the sensor module is maintained in case of error/defect. 58 HB_ISM112_E_V221.doc

61 EXAMPLES FOR APPLICATION 7. EXAMPLES FOR APPLICATION Subsequently several examples for the application of the Intelligent Sensor Modules ISM 111 will be briefly described, in order to demonstrate the versatility and flexibility of the system. Furthermore the examples shall facilitate the practical application of the system. The selected examples represent only a small part of the possibilities the Intelligent Sensor Modules offer. The following examples will be described in detail: Measurement of temperature with Pt100 sensor Measurement of temperature with thermocouples Measurement of pressure with KPY sensor Revolution counting 7.1. Measurement of Temperature with Pt100 Sensor General Remarks on Pt100 Sensors: The measurement of temperature with a Pt100 sensor is based on the measurement of electric resistance. Platinum changes its electric resistance in dependence on temperature in an unambiguous and reproducible manner. Pt100 sensors have a resistance of 100 Ω at 0 C. The temperature coefficient in the range between 0 C and 100 C amounts to Ω/ C. The measuring range lies between -200 C and +850 C. The main reasons why platinum is used as sensor material are its high stability and its characteristic features of noble metal, which make it possible to apply this metal even in severe environmental conditions. The platinum sensor is standardized and has become a world-wide standard. Principle of Measurement: When measuring temperature via Pt100 sensors, the sensor module switches an internal voltage source point to the analog input via a reference resistance, so that the sensor is supplied directly via the analog input. The fall of potential via the Pt100 sensor is measured by the sensor module in 2-wire technique at the connecting terminals and is converted into a value of resistance. The sensor module determines the temperature of the measuring point from the resistance by means of the linearization characteristics deposited in the sensor module. HB_ISM112_E_V221.doc 59

62 EXAMPLES FOR APPLICATION Connection of the Sensor: Connection Scheme Circuit A N A L O G In 1 R0 Rx U1 + U - Rx temperature sensor Figure 7.1 Measurement of temperature with Pt100 sensor The power supply of the sensor modules and the bus are connected with the corresponding terminals on the Intelligent Sensor Module ISM 112. With the measuring method in 2-wire technique the Pt100 sensor is connected with the analog ground (A GND ) and with an analog input (In 1, In 2, In 3 or In 4). Which of the four analog inputs is used for connecting the Pt100 sensors can be seen from the configuration for the module. The configuration is created on a PC with the Configuration Software ICP 100 and is transmitted to the sensor module via the bus. Figure 7.2 Configuration table for measurement of temperature in 2-wire technique 7.2. Measurement of Temperature with Thermocouples General Remarks on Thermocouples: The measurement of temperature with thermocouples is based on the measurement of the electrical voltage. Thermocouples consist of two "thermoelectric wires" made of different materials (e.g. platinum and platinum rhodium) that are welded to each other at one end. If the contact position and the connecting ends of the two thermoelectric wires have different temperatures, a "thermoelectric voltage" U th occurs at the contact position. It is largely proportional to the temperature difference. 60 HB_ISM112_E_V221.doc

63 EXAMPLES FOR APPLICATION Principle of Measurement with External Compensation: When measuring temperature by thermocouples with external compensation, a second thermocouple of the same type is installed beside the thermocouple at the measuring position. This second thermocouple is set to a known reference temperature (cold junction). The second thermocouple is connected in series with the first, the polarity being such as to make the thermoelectric voltages of both thermocouples subtract each other. From the resulting thermoelectric voltage and the temperature of the reference position - which has to be communicated to the sensor module when configuring it - the sensor module determines the temperature of the measuring position by means of the linearization curve. Connection of the Sensor: Connection Scheme Circuit In 1 A N A L O G ϑ ϑr U1 ϑ ϑr -1 ϑ = Lin ( U1 + Lin ϑ r ) Figure 7.3 Measurement of temperature with thermocouple and external cold junction compensation The power supply of the sensor module and the bus are connected with the Intelligent Sensor Module ISM 112 at the corresponding terminals. The thermocouples connected in series are connected with the analog ground (A GND ) and with an analog input (In 1, In 2, In 3 or In 4). Which of the four analog inputs is used for connecting the thermocouple can be seen from the configuration for the module. The configuration is created on a PC by means of the Configuration Software ICP 100 and is transmitted to the sensor module via bus by download. Figure 7.4 Configuration table for measurement of temperature with thermocouple and external compensation HB_ISM112_E_V221.doc 61

64 EXAMPLES FOR APPLICATION 7.3. Measurement of Pressure with KPY10 Sensor General Remarks on the KPY10 Pressure Sensor: Pressure sensors are measuring transformers that transform the physical value pressure into a corresponding electric signal. Their core is the so-called analyzer, consisting of a system chip with a thinly etched silicon membrane and a carrier chip that is also made of silicon. Resistor runs are applied to this membrane by means of ion implantation. The pressure-controlled deflexion of the membrane causes resistance changes based on a piezoresistive effect. Principle of Measurement: The absolute pressure is determined by the KPY10 sensor by a measuring by resistance bridge either in 4 or in 6-wire technique. The voltage required is supplied by the internal supply point of the sensor module via the force-output on the module. The bridge voltage is measured by the sensor module and is referred to the distribution voltage U FORCE (ratio measurement). By means of the linearization characteristics for the sensor deposited in the sensor module the sensor determines the absolute pressure directly. Connection of the Sensor: Connection Scheme Circuit A N A L O G RL UFORCE UZ In 1 In 2 + U - RL UB UB UZ = U1 - U2 UFORCE Figure 7.5 Measurement of pressure with a resistance bridge in 4-wire technique The power supply of the sensor module and the bus are connected with the corresponding terminals on the Intelligent Sensor Module ISM 111. The KPY10 pressure sensor itself is supplied by the force-output on the module. With the measuring method in 4-wire technique the sensor is connected with the voltage output (U FORCE ), with the analog ground (A GND ) and with two analog inputs (In1/In2, In2/In3 or In3/In4). Which of the four analog inputs are used for connecting the sensor can be seen from the configuration for the module. The configuration is created on a PC by means of the Configuration Software ICP 100 and is transmitted to the sensor module by download via the bus. Figure 7.6 Configuration table for measurement of pressure with a resistance bridge in 4-wire technique 62 HB_ISM112_E_V221.doc

65 EXAMPLES FOR APPLICATION 7.4. Revolution Counting General Remarks on Revolution Counting: "Number of revolutions" usually means the number of rotations U of an object per unit of time, usually 1 minute. With incremental procedures the number of revolutions is measured by counting the number of pulses that are caused by rotations per unit of time. The particular advantage of the incremental procedure lies in the fact that the counting can be carried out contactless (electromagnetically, optically) and thus resisting wear and with high precision. An example for revolution counting with incremental transmitter: On the wave of a transmitter a disc with a partitioning by radial grating is installed. Behind the disc there is a luminescent source (photo diode). The light of the photo diode falls through the translucent holes of the disc on a photoelectric cell. The incoming light-induced pulses are converted into electric impulses. The number of impulses per unit of time is directly proportional to the rotational speed of the disc. Principle of Measurement: When counting revolutions the sensor module counts the signal variations occurring per unit of time at the digital output. Only the negative signal edges (1->0) are evaluated in this connection. The number of revolutions per minute can be calculated as: number of revolutions = IpT IpU 60 TB U/min = SF IpT U/min IpT being the number of impulses per unit of time, IpU the number of impulses per rotation, TB the selected time base in seconds, and 60 the multiplication factor in case the rotations shall be indicated in rotations per minute instead of rotations per second. The scaling factor SF is communicated to the sensor module when configuring it, so that the number of revolutions can be calculated and can be displayed referred to the desired unit. HB_ISM112_E_V221.doc 63

66 EXAMPLES FOR APPLICATION Connection of the Sensor: Connection Scheme Circuit f VDC 0 V I/O 1 I/O 1 f B U S SUPPLY D I G I T A L 0 V Figure 7.7 Revolution counting The power supply of the sensor module and the bus are connected with the Intelligent Sensor Module ISM 112 by the corresponding terminals posts. The incremental transmitter is connected with the terminals 0V and with one of the digital inputs/outputs I/O 1 or I/O 2. Which of the two digital inputs/outputs is used for connecting the incremental transmitter is determined by the configuration. The configuration is created on a PC by means of the Configuration Software ICP 100 and is transmitted to the sensor module by download via the bus. The digital input/output is configured as counter input ("Increment") with the "frequency" type of measurement. Figure 7.8 Configuration table for revolution counting 64 HB_ISM112_E_V221.doc

67 ISM 111 COMMUNICATION 8. INITIATION AND TEST 8.1. Before Connecting the Supply Before connecting the distribution voltage with the sensor module, once again check the device as to its appropriate installation and as to its correct voltage control. Please make absolutely sure that the sensor modules have been connected to earth as prescribed and the distribution voltage for all sensor modules does not exceed the indicated 30 VDC After Connecting the Supply After connecting the distribution voltage the sensor module displays the current operating state on the two LEDs at the front of the device. The meanings of the LEDs are given in table 8.1 on the following page Configuration of the Sensor Module Before entering into operation the sensor module has to be programmed and configured as to its specific application. In most cases the programming has already been carried out on delivery (see status of RUN-LED and ERR-LED, table 8.1). The configuration has to be carried out by the user by means of the Configuration Software ICP100 on a PC. RUN (green LED) ERR (red LED) off meaning The distribution voltage has been selected too low or the power supply cannot supply the required power. off flash The sensor module is in the monitor mode. A valid program has not yet been loaded; the appliance is not yet operable. on There is a sensor error detected by the module. Possible causes may be: 1. wrong configuration, 2. line break or short circuit, 3. measured value too large or too small. off The data transmission between the sensor module and the PC is active. There is no error at the moment. flash flash The sensor module is in the download mode. Currently a program or a configuration is transmitted to the module. on There is a sensor error detected by the module. Currently data transmission between the module and the PC is active. off The distribution voltage has been connected orderly. There is no error. Data transmission to the module via bus is not active. on flash There is a communication error detected by the module (bus timeout). Possible causes may be: 1. PC/SPS-program stopped, 2. bus line break. on There is a sensor error detected by the module. Possible causes may be: 1. wrong configuration, 2. line break or short circuit, 3. measured value too large or too small. short off X A telegram has just been dispatched from the sensor module via bus to a control system or to a PC. Table 8.1 Meanings of the LEDs (flash frequency approx. 1Hz) HB_ISM112_E_V221.doc 65

68 COMMUNICATION 9. COMMUNICATION 9.1. General Bus Interface The bus interface of the Intelligent Sensor Modules of the "100" series is a RS485 interface according to the specifications of the EIA-RS485 USA standard Bus Protocol For the Intelligent Sensor Modules of the "100" series download files for the following transmission protocols are available. ASCII-protocol PROFIBUS-protocol according to DIN 19245, part 1 PROFIBUS-DP MODBUS-RTU-protocol acc. to Reference Guide PI-MBUS-300 Rev. D The ASCII-protocol and the PROFIBUS-protocol can be operated simultaneously by the sensor modules at the baud rates 9.6 kbps and 19.2 kbps Character Formats The Intelligent Sensor Modules of the "100" series support the following character formats: format start bit data bit parity bit stop bit char. length ASCII PROFIBUS MODBUS 8N1 1 8 N 1 10 X X X 8E1 1 8 E 1 11 X - X 8O1 1 8 O 1 11 X - X 8N2 1 8 N 2 10 X - X 8E2 1 8 E 2 12 X - X 8O2 1 8 O 1 12 X - X Table 9.1 Supported character transfer formats The character format 8E1 with even parity (E=even) corresponds to the PROFIBUS-definitions according to DIN 19245, part 1, and is supported by the sensor modules in the PROFIBUS-protocol as well as in the ASCII- and MODBUSprotocol. This character format should thus also generally be selected for the transmission. For modem couplings, which mostly can be carried out without a parity-bit, the character format 8N1 is available. This character format is only supported by the ASCII- and MODBUS-protocol. The character format is defined for the sensor modules via the Configuration Software ICP100. If there are no specifications to the contrary, the character format is factory adjusted to even parity (8E1) on delivery of the sensor modules. 66 HB_ISM112_E_V221.doc

69 COMMUNICATION Output Format The user can preset the format in which the data shall be output via the bus with the Configuration Software ICP 100. The sensor module adjusts the data formats accordingly and makes sure that the data are available in the selected unit. For the transmission in the ASCII- and PROFIBUS-format, the format settings listed in table 9.2 and 9.3 can be chosen. At the transmission in the MODBUS-format the output format (integer or real) will automatically be confirmed (Table 9.4). The Coding of a real value in the MODBUS- and PROFIBUS-format is as follows: Coding of the real value: x = s ee...ee mmm...mmm Value: (-1) s 2 e-127 1,m # : <1> <- 8 -> < > format settings range of values unit dependent on the sensor field length decimals 0... field length-1 (max 6) Table 9.2 Format settings for transmission in the ASCII-format format settings length range of values b o o l 1 byte (dec 0: FALSE) and (dec255: TRUE) Integer 2 byte (dec ) i (dec ) r e a l 4 byte (dec ) x (dec ) SET 8 1 byte (dec 0) i (dec 255 ) Table 9.3 Format settings for transmission in the PROFIBUS-format format settings length range of values Integer 2 byte (dec ) i (dec ) r e a l 4 byte (dec ) x (dec ) Table 9.4 Example: The value cm shall be displayed. Transmission in the ASCII-format: Format settings for transmission in the MODBUS-format decimals field length 6 field length 7 field length _ _ _ _ _ E _ E E Table 9.5 Output formats for transmission in the ASCII-format ("_":blank). HB_ISM112_E_V221.doc 67

70 COMMUNICATION Transmission in PROFIBUS- and MODBUS-format: decimals integer real (50) C D3 ( ) 1 01 F7 (503) C D3 ( ) 2 13 A6 (5030) C D3 ( ) 3 xx xx (50309) C D3 ( ) 4 xx xx (503094) C D3 ( ) 5 xx xx ( ) C D3 ( ) 6 xx xx ( ) C D3 ( ) Table 9.6 Output formats for transmission in the PROFIBUS- and the MODBUS-format (the decimal notation is given in parentheses). The following points have to be kept in mind from this example: Decimals are not cut off, but are rounded off. In case of overflow with a transmission in ASCII-format the identification key "E" (for Format Error) is given to the first position in the transmission format. With a transmission in PROFIBUS- and MODBUS-format no identification key is given in case of an overflow. The number of decimals must, however, not be selected too large, if the value is to be transmitted in integer-format (range of values in integer-format limited to to ). 68 HB_ISM112_E_V221.doc

71 COMMUNICATION 9.2. ASCII-Protocol Transmission Sequence In the ASCII-protocol the data are transmitted from and to the sensor module by means of the following sequence: request telegram response telegram request telegram SD.... ED SD ED SD.... ED T1 T2 T3 T1: time between two characters T2: time between request-telegram and corresponding response-telegram T3: time between response-telegram and next request-telegram You will find the minimum and maximum appearing values for T 1, T 2 and T 3 and the adjustment range in the following table 9.7. protocol baud rate T1min T1max T2min T2max T3min T3max adjustable no no yes no no yes A S C I I 2,400 bps 4,800 bps 9,600 bps 19,200 bps 38,400 bps 0 1 CT CT CT CT CT CT T2min x CT 0.1 sec to 600 sec Table 9.7 Values and adjustment range for the times T 1, T 2 and T 3 (CT: character time: 1 CT = character length [bit] / baud rate [bps]) Notice: In the ASCII-protocol T 2max amounts at least 12 msec. The values for T 2min and T 3max and the behavior of the sensor module if the time T 3max is exceeded (communication timeout, see also chapter 6.9, error handling) can be adjusted by means of the Configuration Software ICP 100. The default values for the time T 2min is 1 CT and for the time T 3max 60 sec. HB_ISM112_E_V221.doc 69

72 COMMUNICATION Telegram Format For the request and response telegram it is distinguished between telegrams without and with check sum in the ASCIIprotocol. The various telegrams are differentiated by varying Start-Delimiters (SD). A request telegram without check sum will lead to a response telegram, which will also contain no check sum. The corresponding is valid for requests with check sum. Furthermore there are two short telegrams with a length of one character each. With these telegrams a positive or negative acknowledge respectively can be performed. request telegram without checksum: response telegram without checksum: SD DA ReqDataUnit ED SD ResDataUnit ED 1 2 n 1 1 n 1 n+4 characters n+2 characters request telegram with checksum: response telegram with checksum: SD DA ReqDataUnit FCS ED SD ResDataUnit FCS ED 1 2 n n 2 1 n+6 characters n+4 characters Positive Acknowledge ACK 1 character Negative Acknowledge NAK 1 character SD: Start-Delimiter (length = 1 byte): The Start-Delimiter SD marks the beginning of a telegram. It has the following values in an ASCII-protocol: SD request telegram response telegram with check sum # > without check sum $ = Table 9.8 Start-Delimiter (SD) in the ASCII-protocol DA: Destination-Address (length = 2 byte): The Destination-Address DA identifies the communication partner's address, to whom data shall be transmitted or from whom data shall be requested. Destination-Address can have a value from 1 to 127 in an ASCII-protocol. The value is here given as a two-digit ASCII-string (ASCII "01".."7F"). ReqDataUnit: Request-Data-Unit (length = 1... n byte): The Request-Data-Unit identifies a data field in the request telegram, which contains the data for the communication partner with the DA address. 70 HB_ISM112_E_V221.doc

73 COMMUNICATION ResDataUnit: Response-Data-Unit (length = 1... n byte): The Response-Data-Unit identifies a data field in the response telegram, which contains the data for the calling communication partner. FCS: Frame-Check-Sequence (length = 2 byte): The Frame-Check-Sequence FCS identifies the running digital sum of the telegram. This is the sum of the ASCII-values in the telegram modulo 256. It is calculated in the ASCII-protocol from Start-Delimiter (SD), Destination Adress (DA) and Data-Unit: CheckSum_ASCII = [SD+DA+DataUnit] mod 256. In the ASCII-protocol the value is given as a two-digit ASCII-string (ASCII "00"..."FF"). ED: End-Delimiter (length = 1 byte): The End-Delimiter ED identifies the end of the telegram. In an ASCII-protocol it has the value hex 0D ("Cr"). ACK: Acknowledge (length = 1 byte): With a request, where no data are returned, the orderly performance of the instruction is acknowledged by an "Acknowledge"-character (hex 06). NAK: No-Acknowledge (length = 1 byte): When a request has not been performed orderly, a "No Acknowledge" (hex 15) is sent back. HB_ISM112_E_V221.doc 71

74 COMMUNICATION Instruction Set check sum request telegram response with orderly performence response in case of error read device identification with # aa V cc <cr> > v..v cc <cr> NAK without $ aa V <cr> = v..v <cr> NAK read device information with # aa S cc <cr> > s..s cc <cr> NAK without $ aa S <cr> = s..s <cr> NAK read status information with # aa Z cc <cr> > z..z cc <cr> NAK without $ aa Z <cr> = z..z <cr> NAK read variable information with # aa B kk cc <cr> > b..b cc <cr> NAK without $ aa B kk <cr> = b..b <cr> NAK read data from a variable with # aa R kk cc <cr> > d..d cc <cr> NAK without $ aa R kk <cr> = d..d <cr> NAK write data to a variable with # aa W kk d..d cc <cr> ACK NAK without $ aa W kk d..d <cr> ACK NAK Table 9.9 Instruction set in ASCII-protocol char meaning length range # start delimiter for request telegram with check sum 1 ASCII "#" > start delimiter for response telegram with check sum 1 ASCII ">" $ start delimiter for request telegram without check sum 1 ASCII "$" = start delimiter for response telegram without check sum 1 ASCII "=" <cr> end delimiter (carriage return) 1 hex 0D ACK positive acknowledge 1 hex 06 NAK negative acknowledge 1 hex 15 aa destination address 2 ASCII "01".."7F" cc check sum 2 ASCII "00".."FF" kk variable number 2 ASCII "01".."10" v..v device identification 26 ASCII - String s..s device information 27 ASCII - String z..z status information 4 ASCII - String b..b variable information 29 ASCII - String d..d variable value max. 8 ASCII - String Table 9.10 Explanation of command characters in ASCII-protocol 72 HB_ISM112_E_V221.doc

75 COMMUNICATION Instruction Parameters device identification (v...v) length = 26 char <vendor name>...ascii ("Gantner_")... 8 char <model name>...ascii ("ISM-112_")... 8 char <hw version>...ascii ("xy.yy")... 5 char <sw version>...ascii ("xy.yy")... 5 char x... M : monitor program x... T : calibration and test program x... U : universal program x... A : application specific program y.yy : version x... R : MODBUS-RTU program device information (s...s) length = 27 char <location>...ascii char <serial number>...ascii... 6 char <number of variables>...ascii... 1 char status information (z...z) length = 6 char <variable status>...ascii...4 char <module status>...ascii...2 char <variable st.>= K16..K13 K12..K9 K8..K5 K4..K1 = hex 0XYZ 0 X Y Z ASCII "0XYZ" <module st.> = M8 M7 M6 M5 M4 M3 M2 M1 = hex XY X Y ASCII "XY" If the bit Kn in the variable status is set it indicates that an error has occurred in variable n. A variable error is given when the measuring value is outside of the linearization, e.g. in consequence of a sensor break down or of a short circuit of transmission. If the bit Mn in the module status is set it indicates that an error has occurred in the sensor module. Valid is: M1 = 1: EEPROM - error M5 = 1: (currently not occupied) M2 = 1: FLASH - error M6 = 1: (currently not occupied) M3 = 1: ADC error M7 = 1: (currently not occupied) M4 = 1: configuration - error M8 = 1: (currently not occupied) variable information (b...b) length = 29 char <variable type>...ascii...1 char <variable name>...ascii...20 char <data format>...ascii...1 char <field length>...ascii...1 char <decimals>...ascii...1 char <unit>...ascii...4 char <host input>...ascii...1 char HB_ISM112_E_V221.doc 73

76 COMMUNICATION Coding <variable type>: ASCII "0": Empty Variable (EM) ASCII "1": Analog Input Var. (AI) ASCII "2": Arithmetic Variable (AR) ASCII "3": Digital Output Var. (DO) ASCII "4": Digital Input Var. (DI) "5": Setpoint Variable (SP) "6": Alarm Variable (AL) "9": Controller Variable (CO) "A": Analog Output Variable (AO) Coding <data format>: ASCII "0": no format ASCII "1": B O O L ASCII "2": INTEGER ASCII "3": R E A L ASCII "4": S E T 8 Coding <host input>: ASCII "0": host input is not possible ASCII "1": host input is possible (tare/reset/dig.out/setpoint values) Sample Program The problem definition is: The measured value in variable 2 shall be read from the sensor module with the address number 10. The value has been configured with a field length of seven, two decimals and the unit " C" for output. Sample program for transmission without check sum: (Notation in QBasic, V. 1.0): OPEN "COM1: 9600,N,8,1,RS" FOR RANDOM AS #1 REQ$="$0AR2"+chr$(13) PRINT #1, REQ$ RES$=INPUT$(9,#1) VALUE$=MID$(RES$,2,7) PRINT "Temperature = ", VALUE$ CLOSE END, initialize interface, configure telegram, send request telegram, receive response telegram, determine measured value, output measured value, enable interface, end program Notice: In several programming languages the initialization of the serial interface with even parity and 8 data bits will not be supported. The COM-interface in the PC and the bus interface in the sensor module have to be adjusted and configured on "(N)o parity". 74 HB_ISM112_E_V221.doc

77 COMMUNICATION 9.3. PROFIBUS-Protocol Transmission Sequence In the PROFIBUS-protocol the data are transmitted from and to the sensor module by means of the following sequence: request telegram response telegram request telegram SD ED SD ED SD ED T 1 T 2 T 1 : time between request-telegram and corresponding response-telegram T 2 : time between response-telegram and next request-telegram You will find the minimum and maximum appearing values for T 1 and T 2 and the adjustment range in the following table protocol baud rate T 1min T 1max T 2min T 2max adjustable yes no no yes P R O 9.6 kbps 19.2 kbps CT CT T 1min 0.1 sec F x 3 CT to I B U S kbps kbps CT CT 1,2 600 sec Table 9.11 Values and adjustment range for the times T 1 and T 2 (CT: character time: 1 CT = character length [bit] / baud rate [bps]) Notice: In the PROFIBUS-protocol T 1max amounts at least 2 msec with the baud rates 9.6 kbps and 19.2 kbps and 0.3 msec with the baud rates kbps and kbps. The values for T 1min and T 2max and the behavior of the sensor module if the time T 2max is exceeded (communication timeout, see also chapter 6.9, error handling) can be adjusted by means of the Configuration Software ICP 100. The default values for the time T1min is 1 CT and for the time T 2max 60 sec. HB_ISM112_E_V221.doc 75

78 COMMUNICATION Telegram Format For data transmission via PROFIBUS the following telegram formats are relevant for the Intelligent Sensor Module: Formats with fixed information section length without data field: SD1 DA SA FC FCS ED Formats with variable information section length with data field: SD2 LE LEr SD2 DA SA FC DataUnit FCS ED Formats with fixed information section length with data field: SD3 DA SA FC DataUnit FCS ED With PROFIBUS the various telegram formats are differentiated by varying Start-Delimiters (SD). They can also be called SD1-, SD2- or SD3-telegrams in this context. The telegram formats are valid both for request and response telegrams. However, a request telegram does not necessarily have to be succeeded by a response telegram of the same format. In addition to that there is a telegram which consists of only one character and which is used as either positive or negative acknowledgement, according to the kind of request. Short Acknowledgement: SC SD: Start-Delimiter (length = 1 byte): The Start-Delimiter SD identifies the beginning of a telegram. It has the following values in the PROFIBUS-protocol: telegram request telegram response telegram data field length format SD1 hex 10 hex 10 0 SD2 hex 68 hex (32) SD3 hex A2 hex A2 8 Table 9.12 Start-Delimiter (SD) in the PROFIBUS-protocol LE: Length (length = 1 byte): The Length LE identifies the length of the telegram with variable data field length (SD2-telegram) and comprises the characters from DA to DataUnit. Thus it corresponds to the length of DataUnit+3 and can have values between 4 and 249. In the PROFIBUS-DP-protocol the length of the data field generally is limited to 32 bytes. Since the Intelligent Sensor Modules do not have any telegrams with an usage data length of more than 32 bytes, the sensor modules can also be integrated in bus topologies with DP-protocol. 76 HB_ISM112_E_V221.doc

79 COMMUNICATION LEr: Length-Repeated (length = 1 byte): The Length-Repeated LEr corresponds to the specification Length LE. It is stated again in the telegram for data protection control purposes. DA: Destination-Address (length = 1 byte): The Destination-Address DA identifies the address of the communication partner to whom the data shall be transmitted or from whom data shall be requested. Destination-Address can have values from 0 to 127 in the PROFIBUS-protocol. It is stated here as a hexadecimal value (hex F). SA: Source-Address (length = 1 byte): The Source-Address SA identifies the address of your own appliance and is communicated to the communication partner with the telegram. Source-Address can assume values from 0 to 127 (hex F). FC: Frame-Control (length = 1 byte): The Frame-Control FC identifies the type of telegram (request or response telegram), the type of station (passive or active station), the type of data transmission (send and/or request data, with or without acknowledgement, etc.) and the telegram acknowledgement (successful transmission or unsuccessful transmission). For the entire listing, coding and meaning of the Frame-Control see the PROFIBUS-Norm DIN 19245, part 1. ReqDataUnit: Request-Data-Unit (length = 0... n byte): The Request-Data-Unit identifies a data field in the request telegram which contains the data for the communication partner with the DA address. ResDataUnit: Response-Data-Unit (length = 0... n byte): The Response-Data-Unit identifies a data field in the response telegram which contains the data for the calling communication partner. FCS: Frame-Check-Sequence (length = 1 byte): The Frame-Check-Sequence FCS identifies the check sum of the telegram. In the PROFIBUS-protocol this is the sum of the ASCII-values from DA to DataUnit modulo 256: CheckSum_PROFIBUS = [DA+SA+FC+DataUnit] mod 256. In the PROFIBUS-protocol the value is stated as a hexadecimal value (hex 00.. FF). ED: End-Delimiter (length = 1 byte): The End-Delimiter ED identifies the end of the telegrams. In the PROFIBUS-protocol it has the value hex 16. SC: Short-Acknowledgement-Frame (length = 1 byte): The Short-Acknowledgement-Frame SC identifies a telegram that can be sent back to the communication partner as an acknowledgement. With SDA-requests it can be used as a positive receive acknowledgement. With SRD-requests it can be returned as a negative acknowledgement. HB_ISM112_E_V221.doc 77

80 COMMUNICATION Instruction Set Layer 2-adaption in the PROFIBUS-protocol: With PROFIBUS every bus user has so-called "service access points" (SAPs), via which he can exchange data with the communication partners. With the Intelligent Sensor Modules the SAPs are used for identifying (addressing) the various data and commands of the sensor module. By specifying the DSAP-number (DSAP: Destination SAP) in the data field of the request telegram the sensor module can be informed as to which data shall be transmitted or which function the sensor module shall carry out. The sensor module can also be informed as to to which own SAP (SSAP: Source SAP) the data are to be returned. Request/Response telegram (example SD2-telegram): SD2 LE ReqDataUnit LEr SD2 DA SA FC FCS ED ResDataUnit DSAP SSAP = 0 = 0 Data > 0 = 0 DSAP Data = 0 > 0 SSAP Data > 0 > 0 DSAP SSAP Data A DSAP- or SSAP-entry respectively is identified by setting the highest bit in the address byte of Destination-Address (DA) or Source-Address (SA) respectively. The entry itself is carried out in the first, resp. the second position in the ReqDataUnit data field. The DSAP- and SSAP-entries in the request telegram also appear in the response telegram, where DA, SA, DSAP and SSAP in the response telegram correspond to SA, DA, SSAP and DSAP in the request telegram! If no storage expansion is carried out in the request telegram, the orders are carried out via the Default-SAP. The Default-SAP has the number 0. It does not have to be indicated separately in the telegram. DSAP and SSAP entries are only possible with telegrams with data field (SD2 and SD3 telegrams). 78 HB_ISM112_E_V221.doc

81 COMMUNICATION PROFIBUS - layer 2 commands DSAP service data to the module (ReqDataUnit) data from the module (ResDataUnit) read device identification 0 ident no data <ident> read status information 10 SRD no data <status> read device information 11 SRD no data <Ginfo> read variable information 12 SRD <variable number> <Kinfo> read data from a variable 13 SRD <variable number> <Kx> write data to a variable SRD <variable number> <Px> response without data 14 SDA <variable number> <Px> pos./neg. acknowledge SDN <variable number> <Px> no response tare/reset a variable SRD <variable number> response without data 15 SDA <variable number> pos./neg. acknowledge SDN <variable number> no response read, write and tare/reset variables SRD [<tare/reset>[<p1>[... [<Pn>] ] ] ] <status> <K1>... <Kn> 0 SDA [<tare/reset>[<p1>[... [<Pn>] ] ] ] pos./neg. acknowledge SDN [<tare/reset>[<p1>[... [<Pn>] ] ] ] no response Table 9.13 PROFIBUS - layer 2 commands Notice: If more data are in the ReqDataUnit as required, they will be ignored Instruction Parameters <ident> device identification length = 30 byte <length vendor name>...binary (hex 08)... 1 byte <length model name>...binary (hex 08)... 1 byte <length hw version>...binary (hex 05)... 1 byte <length sw version>...binary (hex 05)... 1 byte <vendor name>...ascii ("Gantner_")... 8 byte <model name>...ascii ("ISM-112_")... 8 byte <hw version>...ascii ("xy.yy")... 5 byte <sw version>...ascii ("xy.yy")... 5 byte x... M : monitor program x... T : calibration and test program x... U : universal program x... A : application specific program y.yy : version x... R : MODBUS-RTU program HB_ISM112_E_V221.doc 79

82 COMMUNICATION <Ginfo> device information length = 27 byte <location>...ascii...20 byte <serial number>...ascii...6 byte <number of variables>...binary...1 byte <status> status information length = 3 byte <variable status>...binary...2 byte <module status>...binary...1 byte <variable status> = K16..K13 K12..K9 K8..K5 K4..K1 = hex 0XYZ 0 X Y Z <module status> = M8 M7 M6 M5 M4 M3 M2 M1 = hex XY X Y If the bit Kn in the variable status is set it indicates that an error has occurred in variable n. A variable error is given when the measuring value is outside of the linearization, e.g. in consequence of a sensor break down or of a short circuit of transmission. If a bit Mn in the module status is set it indicates that an error has occurred in the sensor module. Valid is: M1 = 1: EEPROM - error M5 = 1: (currently not occupied) M2 = 1: FLASH - error M6 = 1: (currently not occupied) M3 = 1: ADC error M7 = 1: (currently not occupied) M4 = 1: configuration - error M8 = 1: (currently not occupied) <Kinfo> variable information length = 29 byte <variable type>...binary...1 byte <variable name>...ascii...20 byte <data format>...binary...1 byte <field length>...binary...1 byte <decimals>...binary...1 byte <unit>...ascii...4 byte <host input>...binary...1 byte Coding <variable type>: ASCII "0": Empty Variable (EM) ASCII "1": Analog Input Var. (AI) ASCII "2": Arithmetic Variable (AR) ASCII "3": Digital Output Var. (DO) ASCII "4": Digital Input Var. (DI) "5": Setpoint Variable (SP) "6": Alarm Variable (AL) "9": Controller Variable (CO) "A": Analog Output Variable (AO) Coding <data format>: hex 00: no format hex 01: B O O L hex 02: INTEGER hex 03: R E A L hex 04: S E T 8 80 HB_ISM112_E_V221.doc

83 COMMUNICATION Coding <host input>: hex 00: host input is not possible hex 01: host input is possible (tare/reset/dig.out/setpoint values) read data from a variable: length = 2..5 byte <variable number>...binary... 1 byte <variable value Kx>...binary... 1, 2 or 4 byte write data to a variable: length = 2..5 byte <variable number>...binary... 1 byte <variable value Px>...binary... 1, 2 or 4 byte tare/reset a variable: length = 1 byte <variable number>...binary... 1 byte read, write and tare/reset variables: length 1 byte <tare/reset>...binary... 1 byte <variable value P1>...binary... 1, 2 or 4 byte <variable value P2>...binary... 1, 2 or 4 byte :... : : <variable value Pn>...binary... 1, 2 or 4 byte ReqDataUnit: [<tare/reset> [ <P1> [... [ <Pn>] ] ] ] ResDataUnit: <K1 > < Kn > If a bit is set in the <tare/reset> byte, the corresponding sensor variable is tarred or reset respectively. The values following the <tare/reset> byte are allocated to the writeable variables of the sensor module, according to the order of their appearance. Writeable variables are Setpoint Variables and Digital Output Variables. HB_ISM112_E_V221.doc 81

84 COMMUNICATION 9.4. MODBUS-Protocol Transmission Sequence In the MODBUS-protocol the data are transmitted from and to the sensor module by means of the following sequence: request telegram response telegram request telegram DA.... CRC DA CRC DA.... CRC T1 T2 T3 T 1 : T 2 : T 3 : time between two characters time between request-telegram and corresponding response-telegram time between response-telegram and next request-telegram You will find the minimum and maximum appearing values for T 1, T 2 and T 3 and the adjustment range in the following table protocol baud rate T 1min T 1max T 2min T 2max T 3min T 3max adjustable no no yes no no yes M O D B U S 2,400 bps 4,800 bps 9,600 bps 19,200 bps 38,400 bps CT 3.5 CT T 2min x CT 0.1 sec to 600 sec Table 9.14 Values and adjustment range for the times T 1, T 2 and T 3 (CT: character time: 1 CT = character length [bit] / baud rate [bps]) Notice: In the MODBUS-protocol T 2max amounts at least 12 msec. The values for T 2min and T 3max and the behavior of the sensor module if the time T 3max is exceeded (communication timeout, see also chapter 6.9, error handling) can be adjusted by means of the Configuration Software ICP 100. The default values for the time T 2min is 1 CT and for the time T 3max 60 sec. 82 HB_ISM112_E_V221.doc

85 COMMUNICATION Telegram Format request telegram idle-interval ADR FNR function parameters / data CRC > 3,5 CT 1 byte 1 byte n byte 2 byte response telegram idle-interval ADR FNR function parameters / data CRC > 3,5 CT 1 byte 1 byte n byte 2 byte The request and response telegrams in the RTU-mode used by the sensor modules are starting with an idle-interval of at least 3.5 character length. Most simple this will be performed by waiting for at least 4 character-times after receiving the last character of a telegram. The telegrams have no Start-Delimiter and no End-Delimiter too. The first field after that idle-interval is the ISM-Address (ADR) followed by the function number (FNR) and the function parameters or data respectively. At the end the telegrams contain a check sum (CRC) with the length of 16 bits. The check sum is calculated from the whole telegram without the CRC itself. The CRC-polynomial is: u 15 + u The start value is hex FFFF Instruction Set With the MODBUS-protocol the data are read and written via register accesses. The following register accesses are defined for the communication with the sensor modules: function number function 03 hex read holding register (read/write register) 04 hex read input register (read only register) 06 hex preset single register 08 hex Diagnostic 10 hex preset multiple register Table 9.15 MODBUS commands supported by the ISM 112 HB_ISM112_E_V221.doc 83

86 COMMUNICATION Read Holding Register Description: With this command input/output registers (read/write registers) can be read. request telegram ADR FNR REGSTA REGNUM CRC 03 MSB LSB MSB LSB MSB LSB response telegram ADR FNR 03 BYTNUM D0 D1... Dn CRC MSB LSB ADR... ISM address (hex 00..7F) FNR... function number (hex 03) REGSTA... address of the first register to be read REGNUM... number of registers to be read BYTNUM... number of databytes (max. 64) D0 - Dn... databytes (max. 64) CRC... check sum CRC polynomial: u 15 + u CRC start value: hex FFFF Read Input Register Description: With this command input registers (read only registers) can be read. request telegram ADR FNR REGSTA REGNUM CRC 04 MSB LSB MSB LSB MSB LSB response telegram ADR FNR 04 BYTNUM D0 D1... Dn CRC MSB LSB 84 HB_ISM112_E_V221.doc

87 COMMUNICATION ADR... ISM address (hex 00..7F) FNR... function number (hex 04) REGSTA... address of the first register to be read REGNUM... number of registers to be read BYTNUM... number of databytes (max. 64) D0 - Dn... databytes (max. 64) CRC... check sum CRC polynomial: u 15 + u CRC start value: hex FFFF Preset Single Register Description: With this command a single register can be written. request telegram ADR FNR REGADR DATA CRC 06 MSB LSB MSB LSB MSB LSB response telegram ADR FNR REGADR DATA CRC 06 MSB LSB MSB LSB MSB LSB ADR... ISM address (hex 00..7F) FNR... function number (hex 06) REGADR... address of the register to be written DATA... dataword (hex FFFF) CRC... check sum CRC polynomial: u 15 + u CRC start value: hex FFFF HB_ISM112_E_V221.doc 85

88 COMMUNICATION Diagnostic Description: With this command a diagnostic telegram will be sent to the sensor module. If the telegram has been received in correct form the module will send this telegram back unchanged (echo telegram). request telegram ADR FNR 08 SUBFCT DATA CRC A5 37 MSB LSB response telegram ADR FNR 08 SUBFCT DATA CRC A5 37 MSB LSB ADR... ISM address (hex 00..7F) FNR... function number (hex 08) SUBFCT... subfunction number (hex 0000) DATA... dataword (hex A537) CRC... check sum CRC polynomial: u 15 + u CRC start value: hex FFFF Preset Multiple Registers Description: With this command a large, continuous field of registers can be written. request telegram ADR FNR REGSTA REGNUM BYTNUM D0 D1... Dn CRC 10 MSB LSB MSB LSB MSB LSB response telegram ADR FNR REGSTA REGNUM CRC 10 MSB LSB MSB LSB MSB LSB 86 HB_ISM112_E_V221.doc

89 COMMUNICATION ADR... ISM address (hex 00..7F) FNR... function number (hex 10) REGSTA... address of the first register to be written REGNUM... number of registers to be written BYTNUM... number of databytes (max. 64) D0 - Dn... databytes (max. 64) CRC... check sum CRC polynomial: u 15 + u CRC start value: hex FFFF Register Contents Register Type Content Range variable values in integer format ro/rw...variable 1...integer value ro/rw...variable 2...integer value : : : : 000F... ro/rw...variable integer value Register Type Content Range read and write variable (real ro/rw...variable 1 real value high word ro/rw...variable 1 real value low word ro/rw...variable 2 real value high word ro/rw...variable 2 real value low word : : : : 002E... ro/rw...variable 16 real value high word F... ro/rw...variable 16 real value low word Attention: The low word and the high word of a variable always have to be read or written simultaneously. Notice: The possibility of a writing command on the registers 0000 up to 002F depends on the configuration. With the following variable types a writing command is valid if this has been allowed by the Configuration Software ICP 100. Analog Input with Tare Function: After a writing command for this variable the tare function will be started. Digital Counter with Reset Function: After a writing command for this variable the counter will be set to zero. Arithmetic Variable with min/max-function and Reset Function: After a writing command for this variable the pull-pointer will be reset. HB_ISM112_E_V221.doc 87

90 COMMUNICATION Setpoint Variable: After a writing command for this variable the new set value will be taken over. Digital Output Variable (Host Output): A writing command for this variable will set the corresponding variable to '1' or '0' respectively. Register Type Content Length variable information 0080 ro... variable 1 variable type...2 byte 0081 ro... variable 1 measuring principle...2 byte 0082 ro... variable 1 field length...2 byte 0083 ro... variable 1 decimals...2 byte 0084 ro... variable 1 tare/reset...2 byte ro... variable 1 units...4 char ro... variable 1 variable name...20 char F variable information for variable F variable information for variable F variable information for variable F variable information for variable F variable information for variable F variable information for variable 6 01A0..01BF variable information for variable 7 01C0..01DF variable information for variable 8 01E0..01FF variable information for variable F variable information for variable F variable information for variable F variable information for variable F variable information for variable F variable information for variable 14 02A0..02BF variable information for variable 15 02C0..02DF variable information for variable 16 Coding <variable type>: hex 0 Empty Variable (LE) hex 1 Analog Input Variable (AI) hex 2 Arithmetic Variable (AR) hex 3 Digital Output Variable (DO) hex 4 Digital Input Variable (DI) hex 5 Setpoint Variable (VO) hex 6 Alarm Variable (AL) hex 9 Controller Variable (CO) hex A Analog Output Variable (AO) Coding <measuring principle>: 88 HB_ISM112_E_V221.doc

91 COMMUNICATION Analog Input: hex 0 voltage single-ended hex 1 voltage differential hex 2 current hex 3 resistance 2-wire technique hex 4 resistance 3-wire technique hex 5 resistance 4-wire technique hex 6 bridge 4-wire technique hex 7 bridge 6-wire technique hex 8 thermocouple internal hex 9 thermocouple external hex A cold junction terminal 1 hex B potentiometric hex C cold junction terminal 2 hex D cold junction terminal 3 hex E cold junction terminal 4 Digital Input: hex 0 no hex 1 host input hex 2 frequency hex 3 progressive counter hex 4 quadrature counter hex 5 up/down counter Digital Output: hex 0 no hex 1 host output hex 2 PWM output hex 3 process output Coding <tare/reset>: hex 0 no tare/reset hex 1 tare/reset valid Register Type Content Length device information ro...number of variables...2 byte ro...serial number...6 char D...ro...location...20 char HB_ISM112_E_V221.doc 89

92 COMMUNICATION Register Type Content Length device identification ro... vendor name ("Gantner_")... 8 char ro... model name ("ISM-112_")... 8 char B... ro... hw version ("xy.yy _")... 8 char 040C..040F... ro... sw version ("xy.yy _")... 8 char x... M x... U x... T x... A x... R y.yy : monitor program : universal program : calibration and test program : application specific program : MODBUS-RTU program : version Register Type Content Length status information ro... module status... 2 byte ro... variable status... 2 byte <module st.> = M16..M13 M12..M9 M8..M5 M4..M1 = hex 0XYZ 0 X Y Z ASCII "0XYZ" <variable st.> = K16..K13 K12..K9 K8..K5 K4..K1 = hex 0XYZ 0 X Y Z ASCII "0XYZ" If the bit Mn in the module status is set it indicates that an error has occurred in the sensor module. Valid is: M1 = 1: EEPROM - Error M2 = 1: FLASH - Error M3 = 1: ADC - Error M4 = 1: Configuration - Error If the bit Kn in the variable status is set it indicates that an error has occurred in variable n. A variable error is given when the measuring value is outside of the linearization, e.g. in consequence of a sensor break down or of a short circuit of transmission. Reserved FD00..FFFF 90 HB_ISM112_E_V221.doc

93 SPECIFICATIONS 10. SPECIFICATIONS Power Supply voltage range: VDC power input: max. 2.7 W switch-on current: max. 1.0 A during 30 ms external protector: max. 1.0 A (inert) internal protector: protection against excess voltage, excess current and polarity conversion (reversible) Signal Inputs/Outputs analog inputs: 4 (voltage, current, resistance) analog output: 1 (current mA) digital inputs/outputs: 2 (low active / open collector) Signal Processing reading rate: max. 200 measurements per second A/D-conversion: 16 bit D/A-conversion: 14 bit Force Output function: voltage output output current: max. 50 ma output voltage: 5 V accuracy: 2 % Analog Inputs (4 per Module) as voltage input: types of measurement: single-ended, differential ranges: ±10 V / ±5 V / ±2,5 V / ±1,25 V / ±625 mv / ±312.5 mv / ±100 mv / ±25 mv / ±6.25 mv input impedance: 100 MΩ accuracy: %, (dependent on range) resolution: %, (dependent on range) temperature drift: ppm/ C, (dependent on range) linearity: 0.01 % HB_ISM112_E_V221.doc 91

94 SPECIFICATION as current input: types of measurement: single-ended ranges: 25 ma / 12,5 ma / 6,25 ma / ma / 1 ma / 250 µa / 62.5 µa input impedance: 100 Ω accuracy: %, (dependent on range) resolution: %, (dependent on range) temperature drift: ppm/ C, (dependent on range) linearity: 0.01 % as resistance input: types of measurement: 2-wire, 3-wire, 4-wire ranges: 20 kω / 10 kω / 5 kω / 2.5 kω / 1.25 kω / 625 Ω / Ω / 200 Ω output current: 0.5 ma accuracy: 0.05 % resolution: %, (dependent on range) temperature drift: 50 ppm/ C linearity: 0.01 % as bridge input: types of measurement: 4-wire, 6-wire ranges: 1 V/V / 0.5 V/V / 0.25 V/V / 125 mv/v / 62.5 mv/v / mv/v / 10 mv/v / 2.5 mv/v / mv/v input impedance: 100 MΩ accuracy: %, (dependent on range) resolution: %, (dependent on range) temperature drift: ppm/ C, (dependent on range) linearity: 0.01 % thermocouples with internal compensation: reference position: Pt 100, integrated into ICJ 108 at input 4 accuracy: ( C) ± t Analog Output (1 per Module) function: current output ranges: ma / ma / variable (0-22 ma) output current: max. 22 ma D/A-conversion: 14 bit burden: max. 1.2 Ω accuracy: 0,05 % resolution: 0,01 % temperature drift: 100 ppm/ C linearity: 0,01 % influence burden: 1 µa / 250 Ω influence supply: 1 µa / 10 V 92 HB_ISM112_E_V221.doc

95 SPECIFICATIONS Digital Inputs/Outputs (2 pro Module) as input: function: status, frequency, counter input voltage: max VDC input current: max. 1.5 ma input frequency: max. 25 khz switch. threshold (low): > 3.5 VDC switch. threshold (high): < 1.0 VDC time base: adjustable between 0.1 and 10 sec. resolution: 1 / time base accuracy: ±1 Hz (time base = 10 s) up to 25 khz ±4 Hz (time base = 2.5 s) up to 25 khz minimal on/off-time: 20 µs as output: function: host-out, process-out, pulse-width (PWM) output voltage: max. 30 V DC output current: max. 100 ma output frequency: max. 100 Hz type of output: open collector internal pull-up: 22 kω Notice: With measurements of voltage of the single-ended type of measurement and with resistance measurings in 2- and 3-wire technique the precision in the smaller measuring ranges can potentially be reduced in combination with current measurements and measurings by resistance bridge Bus Interface: base: RS485, shielded twisted pair dc decoupling: 500 V character formats: 8N1 / 8E1 / 8O1 / 8N2 / 8E2 / 8O2 protocols: ASCII, PROFIBUS layer 1+2, MODBUS-RTU baud rate ASCII: 2,400 / 4,800 / 9,600 / 19,200 / 38,400 bps baud rate PROFIBUS: 9.6 / 19.2 / / kbps baud rate MODBUS: 2,400 / 4,800 / 9,600 / 19,200 / 38,400 bps Operating Conditions: perm. ambient temp.: -20 to +60 C storing temperature: -30 to +85 C moisture: 0 to 95 % at +50 C, non-condensing HB_ISM112_E_V221.doc 93

96 SPECIFICATION Electromagnetic Compatibility: electrostatic discharge (ESD) acc. IEC 801-2: 4kV (level 2) radiated electromagnetic fields acc. IEC 801-3:10V/m (level 3) electrical fast transients acc. IEC 801-4: 2kV/1kV (level 3) radiated RFI / EMI acc. VDE /CISPR11 (class B) Shell: material: ALU-profile and ASA-side pieces dimensions: w69 x h90 x d83 mm w2.7 x h3.5 x d3.3 inch weight: 250 g protective system: IP 20 type of installation: snap-on mounting mounting rail: 35 mm (1.4 inch) acc. to DIN EN connection technique: plug-in terminal screws nom. cross section: max. 1.5 mm² (AWG 16), unifilar/fine-strand strip length: 6 mm (0.2 inch) Notice: For CSA-approved installations the modules are intended to be mounted completely inside another enclosure Circuit: program memory: 64 kbyte Flash-EPROM data memory: 512 byte + serial EEPROM microprocessor: HITACHI H8/520 A/D-conversion: 16 bit, Sigma-Delta-Procedure Accessories / Notice for Orders: The ISM system possesses a line of accessories which fascilitate the rapid, simple mounting and power supply with the Intelligent Sensor Module in the user's installation. In addition components are available in order to build up locally farreaching bus structures and a higher number of with each other connected sensor modules. A PC can be connected directly to a bus via an interface converter, so that the whole system by means of the Configuration Software ICP 100 can rapidly be installed. In specific following accessories are available: ISK 200: Interface Converter IRK 100: Repeater/Converter IBT 100: Bus Termination Plug ICM 100: Module Jack ICJ 108: Cold Junction Terminal for ISM 111 and ISM 112 ICL 100: Converter-Connecting Wire ICP 100: ISM-Configuration Software 94 HB_ISM112_E_V221.doc

97 SPECIFICATIONS HB_ISM112_E_V221.doc 95

98 35 mm (1.4 inch) 33 mm (1.3 inch) In 1 In 2 In 3 In 4 66 mm (2.6 inch) 90 mm (3.5 inch) A B V 0V I/O 1 I/O 2 OUT + OUT - ISM 112 SPECIFICATION 11. SIMPLIFIED DRAWINGS Front View B U S SUPPLY DIGITAL ANALOG ISM 112 INTELLIGENT SENSOR MODULE Gantner RUN ERR A N A L O G UFORCE 45.5 mm (1.8 inch) 69.5 mm (2.7 inch) Side View middle of the frontside and the DIN rail 10 mm (0.4 inch) 83 mm (3.3 inch) 96 HB_ISM112_E_V221.doc

99 ISM 111 PINOUT ARRANGEMENTS FOR DIGITAL SENSORS A. PINOUT ARRANGEMENTS FOR ANALOG SENSORS FOR ISM 112 measurement of voltage measurement of voltage measurement of current single-ended differential single-ended + - U In 1 / 2 / 3 / 4 + U1 - + U2 - In 1 / 2 / 3 In 2 / 3 / 4 In 1 / 2 / 3 / 4 measurement of resistance measurement of resistance measurement of resistance in 2-wire technique in 3-wire technique in 4-wire technique In 1 / 2 / 3 / 4 In 1 / 2 / 3 In 1 / 2 In 2 / 3 In 2 / 3 / 4 In 3 / 4 measuring by resistance measuring by resistance potentiometric bridge in 4-wire technique bridge in 6-wire technique measurements U FORCE U FORCE U FORCE In 1 In 1 / 2 / 3 In 2 / 3 / 4 In 2 In 3 In 1 / 2 / 3 / 4 In 4 measurement of temperature measurement of temperature cold junction for with external compensation with internal compensation internal compensation In 1 / 2 / 3 / 4 In 1 / 2 / 3 In 4 ϑ K HB_ISM112_E_V221.doc 97

100 ISM 111 PINOUT ARRANGEMENTS B. PINOUT ARRANGEMENTS FOR DIGITAL SENSORS FOR ISM 112 status output pulse-width modulation U+ U+ P W M I/O 1 / 2 / 3 / 4 I/O 1 / 2 status recording frequency measurement I/O 1 / 2 / 3 / 4 I/O 1 / 2 f 0 V 0 V up counter up/down counter quadrature counter I/O 1 I/O 1 I/O 1 DIRECT. I/O 2 I/O 2 0 V 0 V 0 V 98 HB_ISM112_E_V221.doc