VersaPoint I/O Module

Transcription

1 GFK-2012A March 2010 Module provides two-input channels for measuring signals from standard thermocouples. It supports thirteen different thermocouples types. In addition, it accepts linear voltage inputs between -15mV and +85mV. Module Specifications Housing dimensions (width x height x depth) Connection style Operating temperature Storage temperature Operating humidity Storage humidity 12.2mm x 120mm x 71.5mm (0.480in. x 4.724in. x 2.795in.) 2-wire sensors -25 C to +55 C (-13 F to +131 F) -25 C to +85 C (-13 F to +185 F) 75% on average. Take appropriate measures against increased humidity (> 85%). 75% on average Degree of protection IP20 according to IEC Class of protection Class 3 according to VDE 0106, IEC Module with the I/O Terminal Strip plugged in Module requires qty. one I/O Terminal Strip, IC220TBK061 or IC220TBK062, ordered separately. See the ordering information below. Features Two differential inputs for thermocouples or linear voltage; one input for an external cold junction PT1000 or Ni Configurable internal detection of cold junction temperature Configurable absolute or differential temperature measurement PT 1000 sensors close to thermocouple terminals for internal detection of cold junction temperature. Three data formats Ordering Information Analog In 16 Bit TC 2 Channels IC220TBK061 I/O Terminal Strip with Shield, qty 5 IC220TBK062 I/O Terminal Strip with Dual Shield, qty 5 Power Consumption Communications power U L Current consumption from local bus U L I/O supply voltage U ANA Current consumption from analog bus U ANA Total power consumption 7.5V 43mA, typical 24VDC 11mA, typical 0.59W, typical 1

2 Installation Instructions High current flowing through the segment and main power busses raises the temperature of the components within the module. To keep the current flowing through the potential jumpers of the analog modules as low as possible, a separate main circuit should be used for analog modules. If analog modules must be used in a main circuit together with other modules, place the analog modules to the right of the standard modules at the end of the main circuit. This module should be located after all other modules to keep current flowing through all voltage jumpers as low as possible, Any current flowing through the voltage jumpers will falsify the temperature of the internal cold junction. Connections Always connect thermocouples using shielded, twistedpair cables. Use encapsulated thermocouples (ungrounded junction) only. Connect the shield at the module only above the shield connector clamp. This prevents the creation of PE loops that could occur if both ends of the shield are connected to PE (protective earth ground). The clamp connects the shield directly to FE (functional earth ground) on the terminal side. Additional wiring is not necessary. Isolate the shield at the sensor. Example: Absolute Temperature Measurement on 2 Channels With absolute temperature measurement, the measuring temperature of T 1 or T 2 is detected through cold junction compensation (T CJ1, T CJ2). Terminal Signal Assignment 1.1, RTD EXT+ Optional (for lab applications only) external reference junction sensor (Pr1000, Ni1000) (plus input) 2.1 RTD EXT- Optional (for lab applications only) external reference junction sensor (Pr1000, Ni1000) (minus input) 1.2 TC+ Thermocouple (plus input) channel TC- Thermocouple (minus input) channel TC+ Thermocouple (plus input) channel TC- Thermocouple (minus input) channel 1 1.4, 2.4 Shield Shield connection (channels 1 and 2) LED Color Meaning D Green Bus diagnostics Example: Differential Temperature Measurement with 2 Thermocouples (K Type) If the two temperature points (A) have the same temperature level, the absolute values of U X1 and U X2 are identical. Both voltages cancel each other out. What remains is the difference between U T1 and U T2. 2

3 Extending the Equalizing Conductor When connecting the shield at a central ground position, you must insulate the shield on the opposite side as shown below. A Terminal Strip with Shield (IC220TBK061 or IC220TBK062) must be used for connecting the sensors. However, the illustration shows the connection schematically (without the sensors). 3

4 Internal Circuit Diagram Electrical Isolation Protocol chip (bus logic including voltage conditioning) Optocoupler Programming Data DC/DC converter with electrical isolation ID code 7F hex (127 decimal ) Microprocessor with multiplexer and analog/digital converter Length code 02 hex Reference voltage Input address area 4 bytes Electrically erasable programmable readonly memory Output address area 4 bytes Amplifier Parameter channel (PCP) 0 bytes Register length (bus) 4 bytes 4

5 Output Data Words for Channel Configuration The module receives two output data words. These data words can be used to configure the module. The module s default configuration can be used without change, or each channel can be configured independently. This configuration setting is not saved, and must be transmitted in each logic scan. Default channel configuration Resolution: 0.1 degree C (1µV). Sensor type: TC type K Data format: Extended diagnostics mode Cold junction Internal The following parameters can be configured: Sensor type Resolution Format for representing the measured values Cold junction Process Data Output Format Each channel has one process data output word associated with it. You must set bit 15 of the corresponding output word to 1 to reconfigure the channel. If bit 15 = 0, the default configuration is used. Set all reserved bits to 0. Configuration Diagnostics In the default format, the following configuration errors are indicated by an error code. If the data format is changed, extended diagnostics are not available. After powerup, the message measured value invalid (error code 8004 hex) appears in the input data. After 1 second (maximum) the preset configuration is accepted and the first measured value is available. If the channel configuration is changed, the corresponding channel is re-initialized. The message measured value invalid (error code 8004 hex ) appears in the input data for 100mS (maximum). If the configuration is invalid, the message Configuration invalid appears (error code 8010 hex). 5

6 To configure a channel, set bit 15 of that output word to 1. If bit 15 is zero, the preset configuration is active. Bit Assignment Decimal Binary Description 15 Configuration 0 0 Default configuration 1 1 Change configuration data Must be zero. 8 Cold Junction 0 0 Internal Compensation 1 1 None 7, 6 Resolution for degree C (1µV) default degree C (10µV) (standard) data format degree F degree F 5, 4 Format 0 00 Signed, 15-bit resolution with extended diag. Default 1 01 Format 2: 12 bit resolution with 3 diagnostic bits 2 10 Format 3: 15 bit resolution, no diagnostics 3 11 Reserved 3-0 Sensor type TC type K, Default TC type J TC type E TC type R TC type S TC type T TC type B TC type N TC type U TC type L TC type C TC type W TC type HK Cold Junction * Voltage: (-15mV to +85mV) (requires default Format configuration) reserved * When Cold Junction is configured as the Sensor Type, the temperature of the cold junction (terminal temperature) is indicated in the input data word. The configured channel is not evaluated in the measuring cycle, so the update time for the module is reduced. 6

7 Process Data Input Words The measured input values are transmitted, per channel, to the controller. The figure below shows the sequence of the input data words. Channel 1 (2 bytes) Channel 2 (2 bytes) For each channel, the format of the input data can be independently configured in three input data formats, as shown below. Default Input Data Format, 15 Bit Resolution with Extended Diagnostics The measured value is represented in bits 14 to 0. An additional bit (bit 15) is available as a sign bit. This format supports extended diagnostics. Values greater than 8000H indicate an error. The error codes are listed below Sign Analog Value Channel Error Codes Values greater than 8000H indicate an error. Hex Decimal Error Over range Open circuit Measured value invalid/no valid measured value available Configuration invalid Module defective Under range 7

8 Significant Measured Values in the Default Data Format The table below compares typical hexadecimal and corresponding decimal values in the default data format. Values are shown for the different combinations of configured sensor type and resolution. Typical Input Values Thermocouple and Cold Junction Sensor Linear Voltage Hex Decimal 0.1 deg resolution 1 deg resolution 1µV resolution 10µV resolution open circuit* open circuit* over range over range >32512 > E A FFFF FF9C FC FA C under range under range < < If the measured value is higher than the process data representation, the error "over range" or "under range" is indicated. * The error message "open circuit" is only indicated in TC operating mode. 8

9 Format 2: 12 Bit Resolution with 3 Diagnostic Bits The measured value is represented in bits 14 to 3. The remaining 4 bits are a sign bit and error bit Sign Analog Value 0 Open Circuit Significant Measured Values in Format 2 The table below compares typical hexadecimal and corresponding decimal values in format 2. Over Voltage Typical Input Values Thermocouple and Cold Junction Sensor Hex Decimal 0.1 deg resolution 1 deg resolution xxxx xxxx xxxx xxx1 bin - Over range (Analog value = high limit of configured thermocouple) E FFFF FFF FC xxxx xxxx xxxx xxx1 bin - Under range (Analog value = low limit of configured thermocouple) xxxx xxxx xxxx xx11 bin - Under range (Analog value = low limit of configured thermocouple) 9

10 Format 3: 15 Bit Resolution, No Diagnostics The measured value is represented in bits 14 to 0. An additional bit (bit 15) is available as a sign bit Sign Analog Value Significant Measured Values in Format 3 The table below compares typical hexadecimal and corresponding decimal values in Format 3. Typical Input Values Thermocouple and Cold Junction Sensor Hex Decimal 0.1 deg resolution 1 deg resolution Upper limit value +1 LSB over range over range E A FFFF FF9C FC lower limit value under range under range - 1 LSB lower limit value -2 LSB open circuit open circuit 10

11 Measuring Ranges The module's measuring ranges depend on the resolution Measuring Ranges for Format 1 and Format 3: Measuring Ranges for Format 2: Input Measuring Ranges Thermocouples -273 degrees C to degrees C Resolution: 0.1 degree C -273 degrees C to degrees C Resolution: 1.0 degree C -459 degrees F to degrees F Resolution: 0.1 degree F -459 degrees F to degrees F Resolution: 1.0 degree F Thermocouples degrees C to degrees C Resolution: 0.8 degree C -272 degrees C to degrees C Resolution: 8 degrees C degrees F to degrees F Resolution: 0.8 degree F -456 degrees F to degrees F Resolution: 8 degrees F The measuring range depends on the configured sensor type: Linear Voltage Sensor -15mV to mV Resolution: 1µV -15mV to +85mV Resolution: 10µV Sensor Type Standard Low Limit High Limit TC type K, Default -270C (-454F) +1372C (+2501F) TC type J -210C (-346F) +1200C (+2192F) TC type E -270C (-454F) +1000C (+1832F) TC type R EN C (-58F) +1768C (+3214F) TC type S -50C (-58F) +1768C (+3214F) TC type T -270C (-454F) +400C (+752F) TC type B +50C (+122F) +1820C (+3308F) TC type N -270C (-454F) +1300C (+2372F) TC type U DIN C (-328F) +600C (+1112F) TC type L -200C (-328F) +900C (+1652F) TC type C -18C ( 0F) +2316C (+4200F) TC type W -18C ( 0F) +2316C (+4200F) TC type HK -200C (-328F) +800C (+1472F) Internal Cold Junction, PT 1000 Sensor DIN IEC C +850C Linear voltage input signal -15mV +85mV 11

12 Tolerances Tolerances at an Ambient Temperature of +25 Degrees C Sensor Type Low Limit Relative Error Absolute Error Relative Error, Max. Absolute Error, Max. TC type K, Default -200C to +1372C +/-0.04% +/-0.6K` +/-0.17% +/-2.4K -328F to +2501F TC type J -210C to +1200C +/-0.04% +/-0.5K` +/-0.15% +/-1.9K -346F to +2192F TC type E -226C to +1000C +/-0.04% +/-0.4K` +/-0.15% +/-1.6K F to +1832F TC type R -50C to +1768C +/-0.14% +/-2.5K` +/-0.57% +/-10.0K -58F to +3214F TC type S -50C to +1768C +/-0.14% +/-2.5K` +/-0.57% +/-10.0K -58F to +3214F TC type T -270C to +400C +/-0.16% +/-0.7K` +/-0.63% +/-2.5K -450F to +752F TC type B +500C to +1820C +/-0.23% +/-4.2K` +/-0.92% +/-16.7K +932F to +3308F TC type N -200C to +1300C +/-0.07% +/-1.0K` +/-0.29% +/-3.7K -328F to +2372F TC type U -200C to +600C +/-0.11% +/-0.7K` +/-0.42% +/-2.5K -328F to +1112F TC type L -200C to +900C +/-0.05% +/-0.5K` +/-0.21% +/-1.9K -328F to +1652F TC type C -18C to +2316C +/-0.07% +/-1.7K` +/-0.29% +/-6.7K 0F to +4200F TC type W -18C to +2316C +/-0.09% +/-2.1K` +/-0.36% +/-8.4K 0F to +4200F TC type HK -200C to +800C +/-0.05% +/-0.4K` +/-0.18% +/-1.5K -328F to +1472F Cold Junction, PT -25C to +85C +/-0.04% +/-0.3K` +/-0.22% +/-1.9K 1000 Sensor Linear voltage signal -15mV to +85mV +/-0.03% +/-25µV +/-0.12% +/-100µV All percentage data refers to the final value of the measuring range. Below the indicated range, more errors are expected because of the low sensitivity of the sensor elements. The tolerance values of the TC sensors refer to a differential temperature measurement without cold junction compensation. The tolerances of the sensor element and the cold junction must also be considered. 12

13 Tolerances at an Ambient Temperature of -25 Degrees C to +55 Degrees C Sensor Type Low Limit Relative Error Absolute Error Relative Error, Max. Absolute Error, Max. TC type K, Default -200C to +1372C +/-0.10% +/-1.4K` +/-0.26% +/-3.6K -328F to +2501F TC type J -210C to +1200C +/-0.09% +/-1.1K` +/-0.23% +/-2.8K -346F to +2192F TC type E -226C to +1000C +/-0.09% +/-0.9K` +/-0.23% +/-2.3K F to +1832F TC type R -50C to +1768C +/-0.34% +/-6.0K` +/-0.85% +/-15.0K -58F to +3214F TC type S -50C to +1768C +/-0.34% +/-6.0K` +/-0.85% +/-15.0K -58F to +3214F TC type T -270C to +400C +/-0.38% +/-1.5K` +/-0.95% +/-3.8K -450F to +752F TC type B +500C to +1820C +/-0.55% +/-10.0K` +/-1.37% +/-25.0K +932F to +3308F TC type N -200C to +1300C +/-0.17% +/-2.2K` +/-0.43% +/-5.6K -328F to +2372F TC type U -200C to +600C +/-0.25% +/-1.5K` +/-0.63% +/-3.8K -328F to +1112F TC type L -200C to +900C +/-0.12% +/-1.1K` +/-0.31% +/-2.8K -328F to +1652F TC type C -18C to +2316C +/-0.17% +/-4.0K` +/-0.43% +/-10.0K 0F to +4200F TC type W -18C to +2316C +/-0.22% +/-5.0K` +/-0.54% +/-12.5K 0F to +4200F TC type HK -200C to +800C +/-0.11% +/-0.9K` +/-0.28% +/-2.2K -328F to +1472F Cold Junction, PT -25C to +85C +/-0.05% +/-0.4K` +/-0.24% +/-2.0K 1000 Sensor Linear voltage signal -15mV to +85mV +/-0.07% +/-60µV +/-0.18% +/-150µV All percentage data refers to the final value of the measuring range. Below the indicated range, more errors are expected because of the low sensitivity of the sensor elements. The tolerance values of the TC sensors refer to a differential temperature measurement without cold junction compensation. The tolerances of the sensor element and the cold junction must also be considered. 13

14 Temperature Response Input Sensor Type Measuring Range for the Tolerances Typical Drift Maximum Drift Voltage input Linear signals -15mV to +85mV 15ppm/K 35ppm/K Tolerances of the Internal Cold Junction Error Type Typical Maximum Sensor tolerance PT1000 (T A = 25C [77F] ) +/-0.2K +/-0.43K Error caused by temperature distribution (channel 1 and channel 2) - - Linearity error because of linearization +/-0.01K +/-0.01K Total error of the cold junction at T A = 25C [77F] ) +/-0.3K +/-1.9K Total error of the cold junction at T A = -25C to +55C (-13F to +131F) +/-0.4K +/-2.0K After applying the supply voltage, the warmup time lasts approximately 30 minutes. Directly after startup the tolerances of the cold junction can be increased by the typical tolerance. The following curve represents the transient response. t[min] time after switching power on T [K] temperature deviation from the measured value in Kelvin (absolute error). The total system error shown above at absolute temperature measurement consists of sensor tolerance, device error, and cold junction error. (1) curve for channel 1 (2) curve for channel 2 14

15 Tolerances Because of Linearization Sensor Type Standard Measuring Range (Software Supported) Maximum Error Because of Sensor Linearization TC type K, Default -270C to +1372C (-454F to +2501F) +/-0.05K TC type J -210C to +1200C (-346F to +2192F) +/-0.05K TC type E -270C to +1000C (-454.8F to +1832F) +/-0.05K TC type R EN C to +1768C (-58F to +3214F) +/-0.05K 1 TC type S -50C to +1768C (-58F to +3214F) +/-0.05K TC type T -270C to +400C (-450F to +752F) +/-0.05K TC type B +500C to +1820C (+932F to +3308F) +/-0.05K TC type N -200C to +1300C (-328F to +2372F) +/-0.05K TC type U DIN C to +600C (-328F to +1112F) +/-0.05K TC type L -200C to +900C (-328F to +1652F) +/-0.05K TC type C -18C to +2316C (0F to +4200F) +/-0.01K TC type W -18C to +2316C (0F to +4200F) +/-0.01K TC type HK -200C to +800C (-328F to +1472F) +/-0.01K Cold Junction, PT -200C to +850C (-328F to +1562F) +/-0.01K 1000 Sensor Linear voltage signal - - Additional Tolerances Influenced by Electromagnetic Interference Type of Electromagnetic Interference Electromagnetic fields according to IEC ; EN ; field strength 10V/m Conducted interference (0.15MHz) according to IEC ; EN , Class 3 (10V) Fast transients according to IEC ; EN ; 2kV; Class 3 Typical, Relative Deviation of the Criterion Measuring Ranga Final Value Channel 1: +/- 9.6% A Channel 2: +/- 5.0% Channel 1: +/- 4.2% A Channel 2: +/-2.5% - B Surge voltage according to IEC ; EN B Electrostatic discharge (ESD) according to IEC B 2; EN (6kV contact / 6 kv air discharge) Additional tolerances can occur with EMI. The values refer to default operation (TC type K with cold junction compensation). Process Data Update Time Action Time Refreshing the measured value in the process data keeping the process data <30mS output word (eg: PD-PUT = 0000hex) The time includes the response time of the electronics module up to the point at which valid values are available to the process data output words. 15

16 Technical Data Analog Inputs Number Connection of the signals Cable length Sensor types that can be used Standards for characteristic curves Voltage input range Temperature measuring units Conversion method of the A/D converter Conversion time of the A/D converter Process data update Limit frequency of the analog filter Safety Devices Surge voltage resistant up to +/- 40V Two inputs for thermocouples or linear voltage 2-wire shielded equalizing conductor for thermocouple with encapsulated sensors Shorter than 30m (94.4 ft) with shielded cables B, C, E, J, K, L, N, R, S, T, U, W, HK DIN EN : 1995 (B, E, J, K, N, R, S, T) EN (U, L) -15mV to +85mV Celsius, Fahrenheit, or µv scale Successive approximation 120µs typical 30mS for both channels, maximum 48Hz TC channels: Terminations 1.2 and 2.2; 1.3 and 2.3 Electrical Isolation To provide electrical isolation between the logic level and the I/O area it is necessary to supply the bus module and the sensors using a power terminal from separate power supplies. Interconnection of power supply units in the 24V range is not allowed. (For detailed information refer to the NIU User s Manual.) Common potentials 24V main power, 24V segment voltage, and GND have the same potential. FE (functional earth ground) is a separate potential area. Isolated Voltages in the RTD Module - Test distance - Test voltage 5V supply incoming remote bus / 7.5V supply (bus logic) 500VAC, 50Hz, 1min. 5V supply outgoing remote bus / 7.5V supply (bus logic) 500VAC, 50Hz, 1min. 7.5V supply (bus logic) / 24V supply (I/O) 500VAC, 50Hz, 1min. 7.5V supply (bus logic) / 24V analog supply (analog I/O) 500VAC, 50Hz, 1min. 24V supply (I/O) / functional earth ground 500VAC, 50Hz, 1min. 24V analog supply (analog I/O) / functional earth ground 500VAC, 50Hz, 1min. Error Messages to the Control System Breakdown of the internal voltage supply Yes Failure or dropping of communications Yes, I/O error message to the NIU module voltage Error Messages via Process Data I/O error / user error Yes 16