2CSG445013D0201 M2M PROFIBUS. Profibus DP interface user manual M2M ABB

Transcription

1 2CSG445013D0201 Profibus DP interface user manual M2M

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3 1 PROFIBUS INTRODUCTION GERAL DESCRIPTION TRANSMISSION METHODS RS485 TERMINATIONS PROFIBUS NETWORK CHARACTERISTICS INTERFACE CHARACTERISTICS PROFIBUS CONNECTION POWER-ON SELF-TEST ACCESS TO THE PAGES INSTRUMT SETUP LED INDICATORS AND ON-LINE ICON PROFIBUS INTERFACE FUNCTIONALITIES COMMUNICATION TELEGRAMS CONTROL BYTE AND STATUS BYTE DESCRIPTION COMMUNICATION PROCESS AND CHANGE OF PAGE READ VALUES MAPPING GSD FILE M2M.gsd INTERFACING TO AN AC500 PLC PLC CONFIGURATION INTERFACING TO A SIMATIC S7 PLC PLC CONFIGURATION

4 1 PROFIBUS INTRODUCTION CHAPTER 1 GERAL INFORMATION cannot be held liable for any damage or personal injury arising from incorrect or improper use of its equipment. This document is subject to changes without prior notice. This manual refers to the instrument firmware version V or later. 1.1 GERAL DESCRIPTION PROFIBUS is the acronym of Process Field Bus. PROFIBUS is a field bus standardised according to IEC 61158/ with applications mainly in the industrial automation and process fields. PROFIBUS is a SINGLE MASTER MULTI SLAVE communication network; it is an open, solid and powerful field bus system characterised by quick response times, completely defined by international standards and capable to allow the connection of different manufacturer s devices, if all in compliance with the same standard. PROFIBUS allows also the reduction of cabling between the network nodes, since it requires a single communication cable only. PROFUBUS communication technology is based on a master-slave architecture: Each PROFIBUS system needs to have at least one master (e.g. a PC or a PLC); Up to 127 devices (master+slave) can be connected in a single system; A PROFIBUS system can be multimaster ; in this case the token architecture is used so that only one master at a time will communicate on the network. The instrument model is a slave equipment implementing the PROFIBUS DP-V0 protocol. A DP slave is a peripheral device acquiring input information and sending data to the central master. The quantity of input and output information data depends on the device type and can reach a maximum of 244 byte. The PROFIBUS DP (Decentralized Peripherals) is normally used to connect decentralized peripheral devices with quick response time, according to the IEC 61158/ standard. This normative prescribes a bit rate range from 9.6 kbps to 12 Mbps over nodes distances up to 300 m, using standard cable and maintaining the maximum operating speed. The DP-V0 version allows only the cyclic input/output data reading, while it does not allow not-cyclic Read/Write functions, which can be done instead by the DP-V1 extension, as well as alarms and interrupts acquisition. 4

5 CHAPTER 1 GERAL INFORMATION PC Active station (master) PROFIBUS DP Passive units interrogation (slave) 1.1 PROFIBUS network with a PC master PLC Active station (master) PROFIBUS DP Passive units interrogation (slave) 1.2 PROFIBUS network with a PLC master 5

6 CHAPTER 1 GERAL INFORMATION PC Active stations (master) PLC Token ring logic among devices PROFIBUS DP Passive units interrogation (slave) 1.3 PROFIBUS network with more than one master station 6

7 CHAPTER 1 GERAL INFORMATION 1.2 TRANSMISSION METHODS The transmission method used by the PROFIBUS DP is the RS485 interface (according to EIA) using a shielded twisted pair cable. The simple and inexpensive RS485 two-conductor transmission method is perfectly suited for linear/tree networks with high-speed transmission RS485 TERMINATIONS The PROFIBUS bus must be always terminated at its ends by means of two terminations. Any of them must be composed by three resistors, as shown in the figure below; the termination must be fed in by 0 to 5Vdc otherwise its resistance is not equal to the characteristic impedance of the cable. Using this architecture it becomes fixed the voltage on the bus when there are no active devices. VP = + 5 V 390 B 220 A 390 DGND 1.4 Termination resistors for the PROFIBUS network 7

8 CHAPTER 1 GERAL INFORMATION Terminators must be always present and powered since the integrity of the bus depends on the devices at its ends. If possible the so-called "Active Terminations" should always be used. This is because usually DB9 dedicated connectors used for devices concatenation are already provided with inside ending-terminators, which may be activated if necessary (6) VP (6) VP B (3) B (3) B A (8) A (8) A (5) DGND (5) DGND DB9 connector of the first device DB9 connector of the last device 1.5 network with termination resistors 8

9 CHAPTER 1 GERAL INFORMATION If it is desired to be protected even if the bus becomes unusable because a device is switched off at one ends, "Active Terminations" must be used. Their presence makes possible to turn on and off any device while maintaining the integrity of the bus. Connector with active termination Connector with inactive termination 1.6 network with active termination 9

10 1.2.2 PROFIBUS NETWORK CHARACTERISTICS CHAPTER 1 GERAL INFORMATION The extension of the PROFIBUS network, realized by signal segmentation and regeneration, is limited to a maximum of 32 nodes/partners (master/slave) per segment; on the other hand the entire network can have up to 126 nodes / partners. If it is desired to increase the length of the bus or use more than 32 stations it is necessary to use repeaters. Any repeater represents a load on the bus. Each new segment introduced has to be terminated at its ends and can have a maximum length dependent on the baud rate; however, it is standard procedure to connect a maximum of 30 loads per segment. They are in the same segment! Max. 29 loads T T REPEATER REPEATER REPEATER T T T Max. 31 loads T T T Max. 31 loads Max. 31 loads Max. 31 loads 1.7 network with repeater Using up to 9 repeaters, it is possible to cover distances from 1 km (at 12 Mbps) to 10 km (at kbps), depending on the speed of transmission. Instead of the standard repeater, diagnostic repeaters can also be used. Besides the regeneration of the signals, they also perform an online monitoring of the bus segment connected. 10

11 CHAPTER 2 2 INTERFACE CHARACTERISTICS 2.1 PROFIBUS CONNECTION The interface to the PROFIBUS bus is realized by using a 9-pin female DSUB connector (DB9F). The pinout DB9F connector is described in the following table PROFIBUS DB9F female connector PIN SIGNAL LINE B 4 RTS 5 GND BUS (ISOLATED) 6 +5V BUS (OUTPUT, ISOLATED 100mA MAX.) 7-8 LINE A 9 - CASE SHIELD 11

12 CHAPTER 2 NOTES: The signals +5V BUS and GND BUS are normally used for the bus terminators but they can also be used to power possible external devices; The external devices must never draw more than 100 ma of current. It is important to bear in mind that these power outputs are not short circuit protected; When for a PROFIBUS connection, a DB9 connector is used, then signals "LINE A, LINE B, +5V BUS, GND BUS, and SHIELD are required; when other types of connectors are used, only the signals ""LINE A, LINE B and SHIELD" are necessary; GND BUS SHIELD 1M 2.2nF&500V 2.2 Internal filtering of the shielded cable The PROFIBUS usually requires filtering of the shielded cable. Please note that this filtering (see figure above) is already built inside the instrument and there is no need for any external hardware or cabling. To increase the noise immunity, the protective shield of the cable and the metal case of the connector should be connected to DB9F PROFIBUS Protection Earth (PE). In case of long distances and/or potential differences on the Earth, the Earth connection must be made only in one point of the bus. 12

13 CHAPTER The following table summarizes the main connection technical characteristics: Protocol Eelectrical Standard Baud rate LED indicators Address Data Connector PROFIBUS with DP-V0 slave functionality according to IEC RS485 with galvanic isolation Automatic detection [ Mbps] AutoBaud Green for node status and Red for error signal 128 byte of input data and 4 byte of output data (see section 2.6) 9 poles female D-shell (DB9F) connector. Do no use connectors with 90 cable outlet since it will interfere with the voltmetric connector. If necessary, replace the voltmetric plug with a flat plug (e.g. GMSTB 2,5/6-ST- 7,62) one spare part is included in the package 2.2 POWER-ON SELF-TEST At power-on the meter performs a self-test on the hardware interface; if a failure occurs during initialization, the instrument will then display the message "PROFIBUS INITIALIZATION FAILED". Besides, it is possible to carry out a more precise hardware test of the PROFIBUS interface once the general self-diagnosis is started up from the user (see M2M manual); in case HW internal errors occur, the messages "ERROR 32" or "ERROR 33" will be displayed. In these cases, contact the technical assistance. 13

14 2.3 ACCESS TO THE PAGES CHAPTER 2 The access to the device page can be done by pressing, in sequence, the control keys. The following layout explains the meaning of the symbols used in this chapter. A B x1 x1 x1 >2s XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX Setup C D A B C Control key sequence Number of times to press the control key How long to press the control key D Page shown after having carried out the sequence at point A 14

15 CHAPTER INSTRUMT SETUP PROFIBUS interface is only available in the model. To configure the activation of the protocol it is enough to program the Profibus node address in the setup menu of the instrument (note: you can not set the node address via remote control): Communication menu Enter? x1 x4 x1 >2s Setup x1 x4 x1 x1 >2s Nod address Addr 126 Setup Setup the Profibus NODE ADDRESS within the range (default = 126). 15

16 2.5 LED INDICATORS AND ON-LINE ICON CHAPTER 2 The table below shows the meaning of the LEDs located on the back of the instrument, in correspondence with the connector: LED STATUS DESCRIPTION Green Off Node off-line or not powered Ok Blinking Node on-line (Exchange mode) Node in Clear Mode Red Off No errors or node not powered Ok Blinking Initialisation error in the Profibus station Error in the configuration data/parameters Once the is on-line in the profibus network, the communication icon (see screen below) will blink to indicate the data exchange with the master. Active energies 3F 1.11MWh L1 L2 L3 3,0,7.1KWh 2,7,2.0KWh 5,3,0.3KWh b Communication icon It blinks when on-line Warning. The icon blinks even after receiving a Clear Mode telegram. 16

17 CHAPTER PROFIBUS INTERFACE FUNCTIONALITIES As a PROFIBUS DP slave device, the address space is within the range 1 to 126 decimals. The instrument provides 4 bytes of output data and 128 bytes of input data. The values measured by the instrument are divided into 3 pages and each one is mapped into the 128 bytes of input data area. The master must first request the page of interest through the 4 bytes of output. For the complete transfer of all the instrument measured values, 3 telegrams will be necessary in order to scan the corresponding 3 pages COMMUNICATION TELEGRAMS The PROFIBUS telegrams to and from the instrument are typically composed by 128 input bytes and 4 output bytes. The telegrams basically consist of a 4-bytes header and, in the case of inputs, additional 124 bytes of user data related to the measured values. MASTER REQUEST TELEGRAM (OUTPUT) OUTPUT ADDRESS MEANING VALUE Header byte 0 Offset = 0 Header byte 1 Offset = 1 Header byte 2 Offset = 2 Header byte 3 Offset = 3 Requested page number [0 : 2] Reserved, not used CONTROL byte Reserved, not used 8 bit binary STATUS TELEGRAM MASTER (INPUT) OUTPUT ADDRESS MEANING VALUE Header byte 0 Data page number Offset = 0 currently available [0 : 2] Header byte 1 Offset = 1 Reserved, not used Header byte 2 Offset = 2 Reserved, not used Header byte 3 Offset = 3 STATUS byte 8 bit binary Data byte byte of data related to DWORD Offset = measured values 17

18 CHAPTER CONTROL BYTE AND STATUS BYTE DESCRIPTION BIT BIT 0 CONTROL BYTE (HEADER BYTE 2 OF THE REQUEST TELEGRAM) BIT [1 : 7] BIT BIT [0 : 3] BIT 4 BIT 5 BIT [6 : 7] MEANING Internal request start/stop. Logic value 1: page request active. The data page number must be specified in the HEADER BYTE 0 of the request telegram. Logic Value 0: request page not active. Not used (ignored by ) STATUS BYTE (HEADER BYTE 3 OF THE STATUS TELEGRAM) MEANING Not used Logic Value 1: page update completed: the currently available page is the one indicated in the HEADER BYTE 0 of the status telegram and shows that the data are valid and congruent. Logic value 0: page update in progress (data not congruent). Logic value 1: latest valid request. Logic Value 0: latest invalid request or no request received. Not used 18

19 CHAPTER COMMUNICATION PROCESS AND CHANGE OF PAGE The simplified sequence to request the data from can be summarized as follows: The master sets the page number through the HEADER BYTE 0 of the request telegram; The master sets equal to 1 the BIT 0 of the HEADER BYTE to activate the page request, and waits for the to load the new page data; When the HEADER BYTE 0 of the status telegram will become equal to HEADER BYTE 0 of the request telegram, and BIT 4 of STATUS BYTE will become equal to 1, then the master can read the values from the input and reset the BIT 0 in the CONTROL BYTE; If BIT 5 of the STATUS BYTE become equal to 0, then the number of the page you requested is not valid; Through 3 request telegrams for the 3 correspondent data pages, the master reads all the variables available from the meter. Note 1: at start-up the always loads the page 0. Note 2: refreshes continuously the last valid page requested. Note 3: in case of invalid page request, the continues to refresh the latest valid page requested (or eventually the default page 0). 19

20 2.6.2 READ VALUES MAPPING PAGE 0 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES 0 Header Byte 0 (Page Number) - Decimal = 0 1 Header Byte 1 (not used) - - = 0 2 Header Byte 2 (not used) - - = Header Byte 3 (STATUS BYTE) Three-phase system Voltage - 8 bit binary V Rated Voltage L1 V Rated Voltage L2 V Rated Voltage L3 V Linked Voltage L12 V Linked Voltage L23 V Linked Voltage L31 V = 0x30 (if latest request valid) = 0x10 (if latest request invalid) 20

21 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES Three-phase 34 system Current ma Line 1 Current ma Line 2 Current ma Line 3 Current Three-phase ma system Power Factor ( * ) Power Factor Line 1 ( * ) Power Factor Line 2 ( * ) Power Factor Line 3 ( * ) Three-phase system CosΦ ( * ) CosΦ Line 1 ( * ) * 1000 Signed Long * 1000 Signed Long * 1000 Signed Long * 1000 Signed Long * 1000 Signed Long * 1000 Signed Long 21

22 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES CosΦ Line 2 74 ( * ) * 1000 Signed Long CosΦ Line 3 ( * ) Three-phase system Apparent Power Apparent Power Line 1 Apparent Power Line 2 Apparent Power Line 3 Three-phase system Active Power Active Power Line 1 Active Power Line 2 Active Power Line 3 * 1000 Signed Long VA VA VA VA W W W W Signed Long Signed Long Signed Long Signed Long 22

23 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES 112 Three-phase 113 system Reactive 114 Power Var Signed Long Reactive Power Line 1 Reactive Power Line 2 Reactive Power Line 3 Var Var Var Signed Long Signed Long Signed Long PAGE 1 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES 0 Header Byte 0 (Page Number) - Decimal = 1 1 Header Byte 1 (not used) - - = 0 2 Header Byte 2 (not used) - - = Header Byte 3 (STATUS BYTE) Three-phase Active Energy Three-phase Reactive Energy - 8 bit binary Wh * 100 Varh * 100 Frequency mhz = 0x30 (if latest request valid) = 0x10 (if latest request invalid) 23

24 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES Max. Current L1 ma Max. Current L2 ma Max. Current L3 ma 28 Max. Three-phase 29 system Active 30 Power W Signed Long Max. Three-phase Apparent Power Aver. Three-phase system Active Power Aver. Three-phase Apparent Power VA W VA Signed Long Active Energy L1 Wh * 100 Active Energy L2 Wh * 100 Active Energy L3 Wh *

25 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES Reactive Energy L1 Varh * Reactive Energy L2 Varh * Reactive Energy L3 Varh * Max. of threephase average Active Power 71 W Signed Long 72 Voltage THDF of 73 Line 1 (normal 74 visualization) * ( & ) Voltage THDF of 77 Line 2 (normal 78 visualization) * ( & ) Voltage THDF of 81 Line 3 (normal 82 visualization) * ( & ) Current THDF of 85 Line 1 (normal 86 visualization) * ( & ) Current THDF of 89 Line 2 (normal 90 visualization) * ( & ) Current THDF of Line 3 (normal visualization) ( & ) *

26 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES 96 Max. of average 97 Active Power W Signed Long 98 Line Max. of average Active Power Line 2 Max. of average Active Power Line 3 Max. of threephase average Apparent Power Max. of average Apparent Power Line 1 Max. of average Apparent Power Line 2 Max. of average Apparent Power Line 3 Aver. Active Power from pulse input (CH1) W W VA VA VA VA W Signed Long Signed Long PAGE 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES 0 Header Byte 0 (Page Number) - Decimal = 2 1 Header Byte 1 (not used) - - = 0 2 Header Byte 2 (not used) - - = 0 26

27 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES Header Byte 3 (STATUS BYTE) Aver. Reactive Power from pulse input CH2) Active Energy from pulse input (CH1) Reactive Energy from pulse input (CH2) Current threshold for timer 2 activation Three-phase Apparent Energy Apparent Energy Line 1 Apparent Energy Line 2 Apparent Energy Line 3 Generated threephase Active Energy - 8 bit binary Var Wh * 100 Varh * 100 ma VAh * 100 VAh * 100 VAh * 100 VAh * 100 Wh * 100 = 0x30 (if latest request valid) = 0x10 (if latest request invalid) 27

28 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES Generated Active 42 Energy Line 1 Wh * Generated Active Energy Line 2 Generated Active Energy Line 3 Generated threephase Reactive Energy Generated Reactive Energy Line 1 Generated Reactive Energy Line 2 Generated Reactive Energy Line 3 Generated threephase Apparent Energy Generated Apparent Energy Line 1 Generated Apparent Energy Line 2 Wh * 100 Wh * 100 Varh * 100 Varh * 100 Varh * 100 Varh * 100 VAh * 100 VAh * 100 VAh * 100 Signed Long 28

29 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES 80 Generated 81 Apparent Energy VAh * Line External TA Ratio (KA) ( $ ) External VT Ratio (KV) ( $ ) Energy factor/impulse of the digital outputs Units Units Units 1: 10Wh(Var)/imp. 2: 100Wh(Var)/imp. 3: 1kWh(kVar)/imp. 4: 10kWh(kVar)/imp = 0xFF 97 - = 0xFF 98 - = 0xFF 99 - = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF 29

30 CHAPTER 2 IND. DESCRIPTION UNIT OF MEASURE FORMAT NOTES = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF = 0xFF The memory locations not implemented in page 2 will be filled with the value 0xFF. Data format: - : it is a binary number of 2 unsigned words (32 bit) - Signed Long: it is a binary number of 2 words (32 bit) that, when negative, is expressed with 2 s complement notation. NOTES: ( * ) Regarding the Power Factor of the three lines, please note that: In case of inductive power factor, the value is positive; vice versa when it is capacitive, the value is negative; When the power factor is not defined (e.g. no current at the input), it is returned the value 2000 to indicate this particular condition. ( & ) Regarding the current and voltage THDF value, please note that: The THDF represents the normalized voltage and current crest factor; In case the THDF is not calculable, the meter returns two words equal to FFFFh corresponding to an invalid data. ( $ ) KA and KV constants represent the ratio between the value of the current (or voltage) transformer primary and the secondary that has been set in the instrument (Prim/Sec). If, for example, in the Setup menu of the instrument the current transformer ratio has been set to '100/5', then this parameter will be

31 CHAPTER GSD FILE M2M.gsd The configuration GSD file M2M.gsd is provided with this document, or it is available from Web site ( Considering that the map of each reading page consists of 128 bytes, organized in 1 DWORD for status and 31 DWORD for data, it is assumed to upload 4 times the module "INPUT_M2M" (8 DWORD) in the input space. For the commands, being the map of 4 bytes, it is assumed to upload 4 times the module "OUTPUT_M2M" (1 byte) in the output space. 31

32 CHAPTER 3 INSTALLATION 3 INTERFACING TO AN AC500 PLC Below is presented an example of the PROFIBUS bus interfacing the instrument M2M PROFIBUS with an AC500 PLC, configured by the software Control Builder Plus. 3.1 PLC CONFIGURATION In Control Builder Plus environment, create the project for a PROFIBUS system composed by: Master Profibus = Station AC500 (eg. PM573); Bus PROFIBUS Slave PROFIBUS = Before to enter in the system the meter, it is necessary to add it to the "library-catalog" of by installing the GSD-file M2M.gsd from the "hardware Configuration" window, as shown in the screenshot below (the GSD file is provided with this document or it is available from the web site at 32

33 CHAPTER 3 INSTALLATION Once installed the GSD-file, the instrument will be available in the catalog among the PROFIBUS-DP devices, in the folder "Logic devices"; then exploring the instrument it will be displayed a list of all the possible modules usable to configure it. 33

34 CHAPTER 3 INSTALLATION Once the M2M device is available, the PLC address mapping can be acquired in automatic mode. To manage the control flow in the PLC, the INPUT/OUTPUT data of the slave device can be displayed in a Watch and Recipe Manager" table like the one shown in the screenshot below. 34

35 CHAPTER 3 INSTALLATION Once the program has been downloaded on the PLC, the status of the variables is displayed as shown below. 35

36 CHAPTER 4 INSTALLATION 4 INTERFACING TO A SIMATIC S7 PLC Below is presented an example of the PROFIBUS bus interfacing the instrument with a SIMATIC S7 SIEMS PLC, configured by the software S7 Manager. 4.1 PLC CONFIGURATION In S7 Manager environment, create the project for a PROFIBUS system composed by: Master Profibus = Station SIMATIC 300 (eg. S7315-2) Bus PROFIBUS Slave PROFIBUS = Before to enter in the system the meter, it is necessary to add it in the "library-catalog" of S7 Manager by installing the GSD-file M2M.gsd from the "Hardware Configuration" window, as shown in the screenshot below (the GSD file is provided with this document or it is available from the web site at DownloadCenter). 36

37 CHAPTER 4 INSTALLATION Once installed the GSD-file, the instrument will be available in the catalog among the PROFIBUS-DP devices, in the folder "Logical devices"; then exploring the instrument it will be displayed a list of all possible configurable modules usable to configure it. 37

38 CHAPTER 4 INSTALLATION The PLC address mapping can be achieved by dragging the modules in connector free slots as shown below. In the example it has been associated the PLC addresses 0, 1, 2, 3 to 4 modules "OUTPUT_M2M" (output byte) necessary to configure the Request Telegram from the master; the PLC address [ ] has been associated to 4 modules "INPUT_M2M" (each corresponding to 8 DWORD), necessary to read the Status Telegram and the 31 values available in the data pages. To manage on the PLC the INPUT/OUTPUT data of the slave device (the meter), it can be created a VAT block like the one shown below, in order to read data in polling. 38

39 CHAPTER 4 INSTALLATION The picture shows an example of how could be the "VAT" associated to PAGE 0 of the data exchanged by the : The header of the response telegram (address [ ]) has been divided into 4 "PEB" (input byte) with binary representation; Any value of the data page (address [ ]) has been described with a "PED" (output Dword) in a decimal display; The request telegram has been divided into 4 MB; each MB has been associated with a PAB (output byte) in the code block shown below. 39

40 CHAPTER 4 INSTALLATION At this point it is possible to compile the project, upload it into the PLC and start the Master-Slave PROFIBUS communication process as described in section

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