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User Manual - Rockwell Automation

1. Gain Calibration Chapter de d oae o ate Troubleshooting Specifications Programming Examples Data Table Formats Block Transfer Mini PLC 2 and PLC 2 20 Processors 2 and 4 Wire RTD Sensors Differences Between Series RTD Modules and Series B C and D RTD Input Modules CSA Hazardous Location Approval Table of Contents toc iii Chapter 7 Chapter Objective 7 1 Diagnostics Reported by the Module 7 1 i Dio 7 1 Status Reported in Words 1 and 2 7 2 Status Reported in Word 13 7 3 Chapter Summary 7 3 Appendix A A 1 Appendix B Sample Programs for the RTD Input Module B 1 PLC 2 Family Processors 1 1 3 Family Processors 2 1 5 Family Processors 3 Appendix 4 Digit Binary Coded Decimal BCD C 1 Signed magnitude Binary C 2 Two s Complement Binary C 3 Appendix D Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors 0 1 Setting the Block Length Multiple GET Instructions only D 3
2. 2 2 Determine Module Placement in the 1 0 Chassis 2 2 Key the Backplane Connector 2 3 Install the Module and Field Wiring Arm 2 3 Connect Wiring to the Field Wiring Arm 2 4 Connection Diagram for the RTD Input Module 1771 IR D 2 5 Ground the Chassis and Module 2 6 Interpret Status 5 2 7 Chapter so Hess 2 7 Chapter 3 Chapter Objectives 3 1 Block Transfer Programming 3 1 PLC 2 Program 3 2 Program robe boe eres PE EE 3 3 PLC 3 Program 2 bra eru RE 3 4 Program ACOM ROI ERE BIRTH RPM 3 4 PLC 5 Program Example 3 5 Progam AGO desse see niet eyes 3 5 Module Scan 3 6 Chapter Summary 3 6 Publication 1771 6 5 129 March 2000 toc ii Table of Contents Configuring Your RTD Module Module Status and Input Data Calibrating Your Module Publication 1771 6 5 129 March 2000 Chapter 4 Chapter Objectives About Configuring Your RTD Module Data Format PI ce S
3. y y 2A Use heat shrink tubing or other suitable insulation where wire exits cable jacket Shield and Drain twisted together 10 Thread forming screw External tooth Washers Interpret Status Indicators Chapter Summary Green RUN indicator Red FAULT indicator 10528 1 Installing the Input Module 2 7 The front panel of the RTD input module contains a green RUN indicator and red FAULT indicator At power up the module momentarily turns on both indicators as a lamp test then checks for correct RAM operation EPROM operation EEPROM operation a valid write block transfer with configuration data If there is no fault the red indicator turns off The green indicator comes on when the module is powered It will flash until the module is programmed If a fault is found initially or occurs later the red fault indicator lights The module also reports status and specific faults if they occur in every transfer of data BTR to the PC processor Monitor the green and red indicators and status bits in word 1 of the BTR file when troubleshooting your module In this chapter you learned how to install your input module in an existing programmable controller system and how to wire to the field wiring arm Publication 1771 6 5 129 March 2000 2 8 I
4. 5 Press INSERT In PROG Mode Action 1 Press SEARCH 8 data address 2 Press CANCEL COMMAND 3 Press DISPLAY O or 1 4 Press DISPLAY 001 and enter data 5 Press INSERT Result Finds the block address transfer instruction Removes preceeding command Displays the file in binary or BCD On line data change Writes data to file element Result Finds the block transfer instruction Removes preceeding command Displays the file in binary or BCD Puts cursor on word 1 Publication 1771 6 5 129 March 2000 B 2 Programming Examples PLC 3 Family Processors Publication 1771 6 5 129 March 2000 Use the above procedure to enter the required words of the write block transfer instruction Be aware that the block length will depend on the number of channels selected and whether biasing and or calibration is or is not performed for example the block may contain only 1 word if no bias or calibration is performed but may contain 14 words if using 6 inputs with bias and calibration The PLC 2 family write block transfer data file should look like Figure B 1 Figure B 1 Write Block Transfer Data Transfer for a PLC 2 Family Processor DATA ADDR 030 BINARY DATA MONITOR BLOCK LENGTH 14 BLOCK XFER WRITE MODULE ADDR 110 FILE 100 115 POSITION FILE DATA 001 00000000 00000000 00000000 00000000 002 00000000 00000000 00000000 00000000 003 00000000 00000000 00000000 00000000 004 00000000 00000000 00000000 00000000 00
5. To get the negative using the two s complement method you must invert each bit from right to left after the first 1 is detected In the above example 0 10110 22 Its two s complement would be 1 01010 22 Note that in the above representation for 22 starting from the right the first digit is a so it is not inverted the second digit is a 1 so it is not inverted digits after this one are inverted If a negative number is given in two s complement its complement a positive number is found in the same way 1 10010 14 0 01110 14 All bits from right to left are inverted after the first 1 is detected The two s complement of 0 is not found since no first 1 is ever encountered in the number The two s complement of 0 then is still 0 Publication 1771 6 5 129 March 2000 C 4 Data Table Formats Publication 1771 6 5 129 March 2000 Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors Appendix D Block Transfer Mini PLC 2 and PLC 2 20 Processors Programming multiple GET instructions is similar to block format instructions programmed for other PLC 2 family processors The data table maps are identical and the way information is addressed and stored in processor memory is the same The only difference is in how you set up block transfer read instructions in your program For multiple GET instructions individual rungs of ladder logic are used instead of a single rung with a bloc
6. a A Allen Bradley RTD Input Module User Cat No 1771 IR Series D M u 4l Important User Information Because of the variety of uses for this product and because of the differences between solid state products and electromechanical products those responsible for applying and using this product must satisfy themselves as to the acceptability of each application and use of this product For more information refer to publication SGI 1 1 Safety Guidelines For The Application Installation and Maintenance of Solid State Control The illustrations charts and layout examples shown in this manual are intended solely to illustrate the text of this manual Because of the many variables and requirements associated with any particular installation Allen Bradley Company cannot assume responsibility or liability for actual use based upon the illustrative uses and applications No patent liability is assumed by Allen Bradley Company with respect to use of information circuits equipment or software described in this text Reproduction of the contents of this manual in whole or in part without written permission of the Allen Bradley Company is prohibited Throughout this manual we make notes to alert you to possible injury to people or damage to equipment under specific circumstances WARNING Tells readers where people may be hurt if procedures are not followed properly CAUTION Tells readers where machinery ma
7. could cause emodule damage edegradation of performance einjury or equipment damage due to possible unexpected operation Publication 1771 6 5 129 March 2000 2 4 Installing the RTD Input Module Place the module in the card guides on the top and bottom of the chassis that guide the module into position Important Apply firm even pressure on the module to seat it into its backplane connector 1771 A1B A2B A3B A4B I O chassis 1771 A1B A2B A4B Series B 1 0 chassis Swing the chassis locking bar down into place to secure the modules Make sure the locking pins engage Snap the chassis latch over the top of the module to secure it Attach the wiring arm 1771 WF to the horizontal bar at the bottom of the chassis The wiring arm pivots upward and connects with the module so you can install or remove the module without disconnecting the wires Wiring to the Connect your I O devices to the field wiring arm cat no 1771 WF Field Wiring Arm shipped with the module ATTENTION Remove power from the 1771 I O chassis backplane and field wiring arm before removing or installing an I O module Failure to remove power from the backplane or wiring arm could cause module damage degradation of performance or injury Failure to remove power from the backplane could cause injury or equipment damage due to possible unexpected operatio
8. Appendix E About 2 and 4 Wire Sensors E 1 Connections for a 2 Wire Sensor E 1 Connections for 3 and 4 Wire Sensors E 2 Connecting 4 Wire Sensors E 3 Connecting a 4 Wire Sensor to the Field Wiring Arm E 3 Appendix F Major Differences between Series F 1 Appendix G CSA Hazardous Location Approval G 1 Publication 1771 6 5 129 March 2000 toc iv Table of Contents Publication 1771 6 5 129 March 2000 Chapter Objectives Module Description Features of the Input Module Chapter 1 Overview of the RTD Input Module This chapter gives you information on features of the input module how an input module communicates with programmable controllers The RTD input module is an intelligent block transfer module that interfaces analog input signals with any Allen Bradley programmable controllers that have block transfer capability Block transfer programming moves input data words from the module s memory to a designated area in the processor data table in a single scan It also moves configuration words from the processor data table to module memory The input module is a single slot module and requires no external power supply After scanning the analog inputs the input data is converted to a specified data type in a digital format to be transferred to the processor
9. Auto calibration can be performed on all channels simultaneously or on selected channels In either case channels being calibrated must be connected to the precision calibration resistors The Series B module requires approximately 2 seconds to power up The red LED is illuminated and the green LED is extinguished if the watchdog timer times out This module employs a digital filter with 120dB decade rolloff from a corner frequency of 8 Hz This Series B module is NOT compatible with the 1771 EX extender board Use the 1771 EZ extender board with Series B Platinum RTD tables are based on IEC751 alpha 00385 The 1771 was based on MINCO Products Inc measurements of IEC751 RTDs If the module is programmed for RTS 0 and the PLC is switched from run to program and back to run an RTS timeout is inhibited on the change from program to run In ohms mode bias is able to produce a negative result Differences Between Series RTD Modules and Series B C and D RTD Input Modules Description Use of Data Table Resistance Range Common Mode Impedance Input Overvoltage Protection Scan Time Real Time Sampling Auto Calibration Open RTD Response Time Power Dissipation Thermal Dissipation Agency Certification when product or packaging is marked The excitation current on Series B flows out of termination A The excitation current on the series A flowed into termination A Systems wired according to the IR U
10. DATA LENGTH X CNTL Block Transfer B Pushbutton Write Done Bit BLOCK XFER WRITE RACK XXX GROUP X EAU MODULE X XXXX Publication 1771 6 5 129 March 2000 Block transfer instructions with the PLC 3 processor use one binary file in a data table section for module location and other related data This is the block transfer control file The block transfer data file stores data that you want transferred to the module when programming a block transfer write or from the module when programming a block transfer read The address of the block transfer data files are stored in the block transfer control file The industrial terminal prompts you to create a control file when a block transfer instruction is being programmed The same block transfer control file is used for both the read and write instructions for your module A different block transfer control file 15 required for every module sample program segment with block transfer instructions is shown and described below Figure 3 2 PLC 3 Family Sample Program Structure BTR ENABLE DATA LENGTH X CNTL XXXX XXXX Program Action At power up the user program examines the BTR done bit in the block transfer read file initiates a write block transfer to configure the module and then does consecutive read block transfers continuously The power up bit can be examined and used anywhere in the program
11. March 2000 3 6 Module Programming subsequent BTW operation is enabled by pushbutton switch rung 2 Changing processor mode will not initiate a block transfer write unless the first pass bit is added to the BTW input conditions Module Scan Time Scan time is defined as the amount of time it takes for the input module to read the input channels and place new data into the data buffer Scan time for your module is shown in specifications appendix A The following description references the sequence numbers in Figure 3 4 Following block transfer write 1 the module inhibits communication until after it has configured the data and loaded calibration constants 2 scanned the inputs 3 and filled the data buffer 4 Write block transfers therefore should only be performed when the module is being configured or calibrated Any time after the second scan begins 5 a BTR request 6 can be acknowledged When operated in real time sample mode RTS 2 00 a BTR may occur at any time after 4 When operated in RTS T will be waived until T milliseconds at which time 1 BTR will be released Figure 3 4 Block Transfer Time End of Block Module available Transfer to perform block Write transfer Block i us i Configure 1st Scan 2nd Scan 3rd Scan Time Time 1 2 3 4 5 6 7 8 9 Internal Scan time 50msec T 100ms 200ms 300ms 3 1sec Cha pter Summary In this ch
12. Save to Not 5 2 4 EEPROM Notused EEPROM Gain Cal Offset Cal used Fault Fault Complete Complete Complete 5 Proceed to gain calibration below Publication 1771 6 5 129 March 2000 6 4 Calibrating Your Module Repeat for each channel Publication 1771 6 5 129 March 2000 Gain Calibration Calibrating gain requires that you apply 402 00 ohms across each input channel Normally all inputs are calibrated together To calibrate the gain of an input proceed as follows 1 Connect 402 00 ohm resistors across each input channel as shown in Figure 6 2 below Figure 6 2 Resistor Location for Gain Calibration Terminal Identification Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 EI 12935 2 Apply power to the module 3 After the connections stabilize request the gain calibration by setting bit 01 in BTW word 15 and sending a block transfer write BTW to the module NOTE Normally all channels are calibrated simultaneously bits 10 15 of word 15 are octal 0 To disable calibration on any channel set 1 the corresponding bit 10 through 15 of word 15 Word Bit Word 15 Performing Manual Calibration Inhibit Calibration on Channel Calibrating Your Module 6 5 4 Queue BTRs to monitor for gain calibration complete and channels which may not have calibrated successfully Save Calibration Values If any uncalib
13. PLC 5 Program Example Module Programming 3 5 Rungs 1 and 2 Rungs 1 and 2 are the block transfer read and write instructions The BTR enable bit in rung 1 being false initiates the first read block transfer After the first read block transfer the module performs block transfer write and then does continuous block transfer reads until the pushbutton is used to request another block transfer write After this single block transfer write is performed the module returns to continuous block transfer reads automatically The PLC S program is very similar to the PLC 3 program with the following exceptions You must use enable bits instead of done bits as the conditions on each rung A separate control file must be selected for each of the BT instructions Refer to Appendix B Figure 3 3 PLC 5 Family Sample Program Structure BT BTR Enable BLOCK XFER READ RACK GROUP MODULE CONTROL DATA FILE XXX XX LENGTH XX CONTINUOUS N Pushbutton BTW Enable B BLOCK XFER WRITE RACK X GROUP x MODULE x Power up Bit CONTROL XXX XX DATA FILE XXX XX LENGTH XX CONTINUOUS N Program Action Rungs 1 and 2 At power up the program enables block transfer read and examines the power up bit in the BTR file rung 1 Then it initiates one block transfer write to configure the module rung 2 Thereafter the program continuously reads data from the module rung 1 Publication 1771 6 5 129
14. Your actual value will be a percentage of 13400 For example if the data in word 3 is 13408 then 13400 13408 134000 0 000597 Your actual data value differs from the theoretical value at 402 0 ohms input resistance by 0 000597 or 0 0597 You can compensate for this error by entering the percentage difference in binary coded fraction form Table 6 A lists the value for bits 7 0 Publication 1771 6 5 129 March 2000 6 8 Calibrating Your Module Table 6 A Value for Bits 7 through 0 Bit Value Bit 07 Sign bit Bit 06 0 0976562 Bit 05 0 0488281 Bit 04 0 024414 Bit 03 0 012207 Bit 02 0 00610351 Bit 01 0 00305175 Bit 00 0 00152587 You use the values that most nearly add up to the percentage that you determined in step 8 For example to attain the value of 0 0597 you need to add Percentage Bit Number 0 0488281 Bit 05 0 00610351 Bit 02 0 00305175 Bit 01 0 00152587 Bit 00 Total 0 0595 As you can see 0 0595 is smaller than 0 0597 but this value is as close as you can come using the 7 possible values listed in Table 6 A You would enter 10100111 in the lower byte of word 9 This sets bits 05 02 01 and 00 which subtracts a gain correction of 0 059596 from the actual input data value Important When you enter data in the least significant byte remember to reenter the data in the most significant byte in the word If you don t the data in the MSB is lost 4 Repeat above
15. are reading resistance in milliohms all other RTDs BTW word 1 bit 10 0 Multiply the data word by 30 to get the actual value in milliohms Resolution is 30 milliohms Word 9 Auto calibration word Bit 00 Offset calibration complete Bit 01 Gain calibration complete Bit 02 Save complete Bit 06 EEPROM fault Publication 1771 6 5 129 March 2000 Module Status and Input Data 5 3 Word Definition Word 9 Bit 07 Faulty calibration no save cont Bits 08 15 Channel failed calibration Bit 10 for input 1 bit 11 for input 2 etc 10 15 Table 5 D Overrange and Underrange Values BTW Word 1 Bit10 gt 600 00 gt 870 Chapter Summary In this chapter you learned the meaning of the status information that the RTD input module sends to the processor Indication Underrange Overange Underrange Overrange Publication 1771 6 5 129 March 2000 5 4 Module Status and Input Data Publication 1771 6 5 129 March 2000 Chapter Objective Tools and Equipment Tool or Equipment Industrial Terminal and Interconnect Cable Precision Resistors Calibrating your Input Module About Auto calibration Chapter 6 Calibrating Your Module In this chapter we tell you how to calibrate your modules In order to calibrate your input module you will need the following tools and equipment Cat No 1770 T3 or Cat No Allen Bradley Company family processors
16. detected one or more of the following conditions Status Reported in Words 1 and 2 Word Indication 1 00 05 Data underrange Bit 05 corresponds to channel 6 bit 04 corresponds to channel 5 and so on If input connections and resistances are correct this status may indicate failed communications between the channel and microprocessor If all channels are underrange a blown fuse or failed dc dc converter may be the cause Successful power up and module is waiting for configuration data Bit 06 is reset after the first successful block transfer write 07 EEPROM calibration constants could not be read The module will continue to operate but readings may be inaccurate Word 1 cont 10 15 Data overrange Bit 15 corresponds to channel 6 bit 14 corresponds to channel 5 and so on If input connections and resistances are correct this status may indicate a failed RTD functional analog block RTD FAB 16 RTS timed out The module updated its inputs before the processor read them 17 Not used Publication 1771 6 5 129 March 2000 Troubleshooting 7 3 Word Indication Indicates that the default bias of 1000 0 has been subtracted from the measured value If sending binary data no overflow occurs unless there is a hardware malfunction Not used Data sign bits formatted for BCD or signed magnitude Bit 10 corresponds to channel 1 bit 11 to channel 2 and so on Not used Status Reported in Word 9 Design your program
17. indicators 8 1 reported by module 8 1 words reported 8 2 differences between series A and series B F 1 E electrostatic damage 3 1 F field wiring arm 3 3 catalog number 3 3 G grounding 3 5 installation module 3 5 K keying bands location 3 2 keying your module 3 2 manual calibration gain 7 7 offset 7 6 performing 7 5 module description 2 1 module location 3 2 0 overrange and underrange values 6 3 Power requirements 3 2 pre installation considerations 3 1 Publication 1771 6 5 129 March 2000 Index Publication 1771 6 5 129 March 2000 programming using 6200 software 5 1 with multiple GETs D 1 programming example PLC 2 4 2 PLC 3 4 4 PLC 5 4 6 programs sample PLC 2 B 1 PLC 3 B 3 PLC 5 B 4 R real time sampling 5 3 bit settings 5 3 resistance cable impedance 3 4 RTD input module features 2 1 S scan time 4 7 sensors about 2 and 4 wire E 1 connecting 4 wire E 2 specifications A 1 error summary A 2 T troubleshooting table 8 2 types of RTDs 5 2 U units of measure 5 2 W Wiring connections 3 wire cable 3 3 wiring connections 3 3 wy Allen Bradley Publication Problem Report If you find a problem with our documentation please complete and return this form Pub Name __ Input Module User Manual Chec
18. is sensitive to electrostatic discharge Discharge ATTENTION Electrostatic discharge can damage integrated circuits or semiconductors if you touch backplane connector pins Follow these guidelines when you handle the module Touch a grounded object to discharge static potential Wear an approved wrist strap grounding device Do not touch the backplane connector or connector pins Do not touch circuit components inside the module If available use a static safe work station When not in use keep the module in its static shield bag Understand Compliance to This product has the CE mark and is approved for installation within European Union Directives the European Union and EEA regions It has been designed and tested to meet the following directives Publication 1771 6 5 129 March 2000 2 2 Installing the RTD Input Module Calculate Power Requirements Determine Module Placement in the 1 0 Chassis Publication 1771 6 5 129 March 2000 EMC Directive This product is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility EMC and the following standards in whole or in part documented in a technical construction file EN 50081 2EMC Generic Emission Standard Part 2 Industrial Environment EN 50082 2EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use in an industrial environment Low Voltage Directive This product is tested
19. monitor status bits such as overrange underrange and block transfer read BTR activity The following example programs illustrate the minimum programming required for communication to take place Publication 1771 6 5 129 March 2000 3 2 PLC 2 Program Publication 1771 6 5 129 March 2000 Module Programming Note that PLC 2 processors that do not have the block transfer instruction must use the GET GET block transfer format which is outlined in Appendix D Figure 3 1 PLC 2 Family Sample Program Structure Block Transfer Read Done Bit FILE TO FILE MOVE 1 COUNTER ADDR XXX 17 POSITION XXX FILE LENGTH XXX Done FILE A YYYY XXXX HDN FILE R XXX XXX 15 RATE PER SCAN XXX Storage Pushbutton Bit 2 L Block Transfer Write Storage Done Bit Pushbutton Bit A 3 12 mir iu Block Transfer Write Storage Done Bit Bit 4 L Block Transfer Read Storage Done Bit Power up Bit Bit 5 Storage Enable Power up Bit Done Bit p BLOCK XFER READ EN DATA ADDR X7 ucc MODULE ADDR RGS 5 BLOCK LENGTH xx one FILE ADN gt Power up XFER WRITE 1 DATA ADDR Storage MODULE ADDR RGS Bit BLOCK LENGTH XX FILE 1 You can replace the pushbutton with a timer done bit to initiate the block transfer write on a timed basis You can
20. resistors as shown in Figure 6 1 2 Examine word 3 channel 1 data in the read block transfer file Note the value It should be around 1 00 100 for 10 mohm resolution 33 for 30 mohm resolution Examine word 9 of the write block transfer data file Bits 16 10 make up the offset correction byte Bit 17 is the sign bit Subtract the data value that you noted in step 2 from 100 The difference should be within 127 to 127 If it is not the required correction is beyond the range of software calibration If the difference is within range input the difference positive or negative in binary form in bits 17 10 of word 9 in the write block transfer file For example if at 1 00 ohm word 3 of the read block transfer data file shows 147 you would subtract 147 from 100 which equals 47 You would then enter 10101111 47 in the upper byte of word 9 The leading 1 bit 17 is the polarity bit It indicates a negative correction factor That is you want to subtract 47 counts from your input data The lower byte remains 00 during offset calibration Repeat above steps for channels 2 through 6 respectively Apply the values by sending a BTW to the module Gain Calibration 1 Connect the 402 00 01 resistors to the swing arm as shown in Figure 6 2 Place the module in platinum ohm mode This provides 30 mohm resolution display Examine word 3 of the read block transfer data file It should be around 13400 decimal
21. s data table on request The block transfer mode is disabled until this input scan is complete Consequently the minimum interval between block transfer reads 50ms is the same as the total input update time for each analog input module The RTD input module senses up to 6 RTD signals at its inputs and converts them to corresponding temperature or resistance in 4 digit BCD or 16 bit binary format Module features include Six resistance temperature detector inputs Reports C F or ohms for 100 ohm platinum or 10 ohm copper sensors Reports ohms for other types of sensors software configurable 0 1 degree 10 milliohm input resolution auto calibration open wire detection The module can be configured for 100 ohm platinum or 10 ohm copper RTDs or other sensor types such as 120 ohm nickel RTDs Temperature ranges are available in degrees C or F Values can also be measured in ohms Publication 1771 6 5 129 March 2000 1 2 Overview of the RTD Input Module How Analog Modules Communicate with Programmable Controllers When using 10 ohm copper RTDs you must dedicate your module for exclusive use with 10 ohm copper RTDs You can configure the module to accept signals from any combination of 100 ohm platinum and other types of non copper RTDs Both cases are determined by block transfer write BTW selection The processor transfers data to and from the module using block transfer write BTW a
22. steps for channels 2 through 6 5 Apply the values by sending a BTW to the module Chapter Summary In this chapter you learned how to calibrate your input module Publication 1771 6 5 129 March 2000 Chapter Objective Diagnostics Reported by the Module Chapter 7 Troubleshooting We describe how to troubleshoot your module by observing LED indicators and by monitoring status bits reported to the processor At power up the module momentarily turns on both indicators as a lamp test then checks for correct RAM operation EPROM operation EEPROM operation a valid write block transfer with configuration data Thereafter the module lights the green RUN indicator when operating without fault or lights the red fault FLT indicator when it detects fault conditions If the red FLT indicator is on block transfer will be inhibited The module also reports status and specific faults if they occur in every transfer of data to the PC processor Monitor the green and red indicators and the status bits in word 1 of the BTR file when troubleshooting your module Indicators Green RUN LED Red Fault FLT LED This module uses a read block transfer to transmit data and to monitor module and data status Word 1 of the read block transfer data file contains module status power up and data out of range information Word 2 contains data polarity and overflow information Words 3 through 8 are data words Tab
23. the CSA certification product label CL DIV2 GP A B C D SP TEMP To comply with CSA certification for use in hazardous locations the following information becomes part of the product literature for CSA certified Allen Bradley industrial control products e This equipment is suitable for use in Class Division 2 Groups A B C D or non hazardous locations only The products having the appropriate CSA markings that is Class Division 2 Groups A B C D are certified for use in other equipment where the suitability of combination that is application or use is determined by the CSA or the local inspection office having jurisdiction Important Due to the modular nature of a PLC control system the product with the highest temperature rating determines the overall temperature code rating of a PLC control system in a Class Division 2 location The temperature code rating is marked on the product label as shown Temperature code rating CLI 2 GP A B C D The following warnings apply to products having CSA certification for use hazardous locations Look for temperature code rating here WARNING Explosion hazard e Substitution of components may impair suitability for Class Division 2 Do not replace components unless power has been switched off or the area is known to be non hazardous Do not disconnect equipment unless power has been switched off
24. to meet Council Directive 73 23 EEC Low Voltage by applying the safety requirements of EN 61131 2 Programmable Controllers Part 2 Equipment Requirements and Tests For specific information required by EN 61131 2 see the appropriate sections in this publication as well as Allen Bradley publication 1770 4 1 Industrial Automation Wiring and Grounding Guidelines Open style devices must be provided with environmental and safety protection by proper mounting in enclosures designed for specific application conditions See NEMA Standards publication 250 and IEC publication 529 as applicable for explanations of the degrees of protection provided by different types of enclosure The module receives its power through the 1771 I O power supply and requires 950mA at 5V 4 75 Watts from the backplane Add this current to the requirements of all other modules in the I O chassis to prevent overloading the chassis backplane and or backplane power supply You can place your module in any I O module slot of the I O chassis except for the extreme left slot This slot is reserved for PC processors or adapter modules ATTENTION Do not insert or remove modules from the I O chassis while system power is ON Failure to observe this rule could result in damage to module circuitry Installing the RTD Input Module 2 3 Group your modules to minimize adverse affects from radiated electrical noise and heat We recommend the following Group
25. to monitor status bits in word 9 during calibration and to take appropriate action depending on your requirements You may also want to monitor these bits while troubleshooting with your industrial terminal The module sets a bit 1 to indicate it has detected one or more of the following conditions Status Reported in Word 13 Condition Bit 10 channel 1 through bit 16 channel 6 could not be calibrated Check field wiring arm connections and source for proper resistance Chapter Summary In this chapter you learned how to interpret the LED status indicators and troubleshoot your input module Publication 1771 6 5 129 March 2000 7 4 Troubleshooting Publication 1771 6 5 129 March 2000 Appendix A Specifications Description Number of Inputs Module Location Sensor Type Units of measure Temperature Range Resistance Range Resolution Sensor Excitation Common Mode Rejection Common Mode Impedance Normal Mode Rejection Input Overvoltage Protection Open RTD Response Time Scan Time Isolation Voltage Backplane Current Power Dissipation Thermal Dissipation Environmental Conditions Operating Temperature Rate of Change Storage Temperature Relative Humidity Operating Storage Temperature Coefficient Specifications continued on next page Value 6 RTD input channels 1771 Chassis 100 ohm platinum alpha 0 00385 or 10 ohm copper alpha 0 00386 Other types may be used wi
26. 00 00000000 00000000 00000000 00000000 00000000 1 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 DATA MONITOR PROG 1 0 OFF NO FORCES W03 0 NO EDITS 2 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 RUNG RM000000 3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 MEM PROT OFF 3 Enter the data corresponding to your bit selection in word 0 4 When you have entered your data press ENTER If you make a mistake make sure the cursor is over the word you desire to change Enter the correct data and press ENTER 5 Press CANCEL COMMAND This returns you to the ladder diagram The following is a sample procedure for entering data in the configuration words of the block transfer write instruction when using a PLC 5 processor For a complete sample program refer to Figure 4 3 1 Enter the following rung BTW BLOCK XFER WRITE 0 Power Up Bit Dy CONTROL N7 0 HER DATA FILE N7 60 LENGTH 14 N7 60 is the address of the BTW transfer file CONTINUOUS Publication 1771 6 5 129 March 2000 B 4 Programming Examples Publication 1771 6 5 129 March 2000 2 Press F8 F5 and enter N7 60 to display the configuration block The industrial terminal screen should like figure B 3 Figure B 3 Samp
27. 1 6 5 129 March 2000 When displaying copper 10mohm bit resolution in ohms the resistance will be provided up to 327 67 ohms at which point an overrange will occur overrange on the Series A was 20 72 ohms Platinum 30mohm bit resolution will over range at 600 00 ohms but continue to measure until the input saturates Series A was 399 99 ohms Underrange for the Series B will be 1 ohm but continue to display until the input can no longer track The Series underranged at copper 1 17 ohms platinum 18 39 ohms The Series B continues to track beyond the under or overrange except overrange on copper which clamps at 327 67 ohms The Series A clamped the reading at the under or overrange value Open RTD detection excitation signal disconnected will flag an Overrange instead of Underrange Open RTD detection is 0 5 seconds Overrange will continue to function as a flag even if single channel ohms has been requested Whena channel is displaying temperature and an overrange is detected BTR temperature data for that channel will be clamped at the RTD maximum temperature Platinum 870 C or 598 F with Overflow if customer bias has not been applied Copper 2609 or 5009F A block transfer with a word length of 00 will return with the Series block transfer default length 14 for a write 8 for a read To access the auto calibration word the block transfer length must be set to 15 for a write and 9 for a read
28. 1784 145 T50 etc Highland Heights OH 1 00 ohm 196 quantity of 6 Dale 402 0 ohm 0 0196 quantity of 6 TRW You must calibrate the module in an I O chassis The module must communicate with the processor and industrial terminal Before calibrating your module you must enter ladder logic into the processor memory so that you can initiate BTWs to the module and the processor can read inputs from the module Calibration can be accomplished using either of two methods auto calibration manual calibration Auto calibration calibrates the input by generating offset and gain correction values and storing them in EEPROM These values are read out of EEPROM and placed in RAM memory at initialization of the module The auto calibration routine operates as follows Whenever a block transfer write BTW is performed to the module any time after the module has been powered up it interrogates word 15 for a request for auto calibration The request can be for the following offset calibration gain calibration save operation save to EEPROM When using auto calibration write transfer calibration words 9 through 14 must contain zeroes Publication 1771 6 5 129 March 2000 6 2 Calibrating Your Module Performing Calibration of the module consists of applying 1 00 ohm resistance Auto calibration across each input channel for offset calibration and 402 00 ohm across each input channel for gain correction
29. 5 00000000 00000000 00000000 00000000 006 00000000 00000000 00000000 00000000 007 00000000 00000000 00000000 00000000 008 00000000 00000000 00000000 00000000 Following is a sample procedure for entering data in the configuration words of the write block transfer instruction when using PLC 3 processor For complete sample program refer to Figure 4 2 To enter data in the configuration words follow these steps Example Enter the following rung for a write block transfer W BLOCK XFER WRITE RACK 001 GROUP 1 Power Up Bit MODULE 1 HIGH DATA F0003 0000 LENGTH 14 CNTL FB004 0000 F0003 0000 is the address of the write block transfer data file You want to enter examine word 1 Programming Examples PLC 5 Family Processors 1 Press SHIFT MODE to display your ladder diagram on the industrial terminal 2 Press DD 03 0 ENTER to display the block transfer write file The industrial terminal screen should look like Figure B 2 Notice the highlighted block of zeroes This highlighted block is the cursor It should be in the same place as it appears in figure B 2 If it is not you can move it to the desired position with the cursor control keys Once you have the highlighted cursor in the right place you can go on to step 3 Figure B 2 Write Block Transfer for a PLC 3 Processor START W0003 0000 WORD 0 00000 00004 00010 00014 00020 00000000 00000000 00000000 00000000 000000
30. 9 March 2000 2 Data Table Formats Table C A BCD Representation 23 8 28 vane Q 29 1 Equivalent 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 1 8 1 9 5 ned magnitude Binary Signed magnitude binary is a means of communicating numbers to your processsor It should be used with the PLC 2 family when performing computations in the processor It cannot be used to manipulate binary 12 bit values or negative values Example The following binary number is equal to decimal 22 10110 2210 The signed magnitude method places an extra sign bit in the left most position and lets this bit determine whether the number is positive or negative The number is positive if the sign bit is 0 and negative if the sign bit is 1 Using the signed magnitude method 0 10110 22 1 10110 22 Publication 1771 6 5 129 March 2000 Two s Complement Binary Data Table Formats C 3 Two s complement binary is used with PLC 3 processors when performing mathematical calculations internal to the processor To complement a number means to change it to a negative number For example the following binary number is equal to decimal 22 101105 2240 First the two s complement method places an extra bit sign bit in the left most position and lets this bit determine whether the number is positive or negative The number is positive if the sign bit is 0 and negative if the sign bit is 1 Using the complement method 0 10110 22
31. Bit 012 07 012 01 012 02 12172 Block Transfer Mini PLC 2 and PLC 2 20 Processors D 3 Setting the Block Length The input module transfers a specific number of words in one block Multiple GET Instructions length The number of words transferred is determined by the block only length entered in the output image table control byte corresponding For Block Transfer Active Operations Only to the module s address The bits in the output image table control byte bits 00 05 must be programmed to specify a binary value equal to the number of words to be transferred For example Figure D 2 shows if your input module is set up to transfer 6 words you would set bits 01 and 02 of the lower image table control byte The binary equivalent of 6 words is 000110 You would also set bit 07 when programming the module for block transfer read operations Bit 06 is used when block transfer write operations are required Figure D 2 Setting Block Length Multiple GET Instructions only Block Transfer Read 6 Words Read Enable Bit from Module 1 00001 1 0 TL 010 Data Table Output Image Table Control Byte Contains Read Output Image Tabl 012 Enable Bit and Block Length in Binary Code 017 027 Data Address 030 Contains Module Address in BCD 12713 Binary Bit Pattern Number of Lower Output Image Table Byte Words to Transfer Publication 1771 6 5 129 March 2000 D 4 Block Transfer Mini
32. Offset Calibration Normally all inputs are calibrated together To calibrate the offset of an input proceed as follows 1 Connect 1 00 ohm resistors across each input channel as shown in Figure 6 1 Figure 6 1 Resistor Location for Offset Calibration Terminal Identification Repeat for Channel 1 each channel 1 00 ohm Resistor Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 B B B B B B 12935 2 Apply power to the module 3 After the connections stabilize request the offset calibration by setting bit 00 in block transfer write word 15 and sending a block transfer write to the module Refer to the table below Publication 1771 6 5 129 March 2000 Word Bit Calibrating Your Module 6 3 Write Block Transfer Word 15 Word Bit Inhibit Calibration on Channel Requested Auto Calibration Word 15 Requested Set these 5 3 2 Set these bits to 0 Save Requested Requested bits to 0 Values Gain Cal Offset Cal NOTE Normally all channels are calibrated simultaneously bits 10 15 of word 15 are octal 0 To disable calibration on any channel set 1 the corresponding bit 10 through 15 of word 15 4 Queue block transfer reads BTRs to monitor for offset calibration complete and any channels which may have not calibrated successfully Refer to the table below Read Block Transfer Word 9 Uncalibrated Channels Auto Calibration Status
33. PLC 2 and PLC 2 20 Processors Publication 1771 6 5 129 March 2000 Appendix E 2 and 4 Wire RTD Sensors About 2 and 4 Wire You can connect 2 wire and 4 wire sensors to the RTD module Sensors Before we show you how to do this let s examine the differences between 2 3 and 4 wire sensors A 2 wire sensor is composed of just that a sensor and 2 lead wires Its schematic representation is shown below Connections for a 2 Wire Sensor A 12950 1 A sensor requires at least three leads to compensate for lead resistance error that is an error caused by resistance mismatch between the lead wires Therefore 2 wire sensor cannot provide compensation for error caused by lead wire resistance We do not recommend that you use 2 wire sensors Publication 1771 6 5 129 March 2000 E 2 2 and 4 Wire RTD Sensors Publication 1771 6 5 129 March 2000 Three wire and 4 wire sensors compensate for lead resistance error Their schematic representation is shown below The amount of error elimination depends upon the difference between the resistance values of the lead wires The closer the resistance values are to each other the greater the amount of error that is eliminated Connections for 3 and 4 Wire Sensors 3 Wire Sensor Leave Open 4 Wire Sensor There are several ways to insure that the lead resistance values match as closely as possible They are use heavy gauge wire 16 18 gauge keep
34. Your RTD Module 4 3 The real time sampling RTS mode of operation provides data from a fixed time period for use by the processor RTS is invaluable for time based functions such as PID and totalization in the PLC It allows accurate time based calculations in local or remote I O racks In the RTS mode the module scans and updates its inputs at a user defined time interval AT instead of the default interval The module ignores block transfer read BTR requests for data until the sample time period elapses The BTR of a particular data set occurs only once at the end of the sample period and subsequent requests for transferred data are ignored by the module until a new data set is available If a BTR does not occur before the end of the next RTS period a time out bit is set in BTR status area When set this bit indicates that at least one data set was not transferred to the processor The actual number of data sets missed is unknown The time out bit is reset at the completion of BTR Set appropriate bits in the BTW data file to enable the RTS mode You can select RTS periods ranging from 100 milliseconds ms to 3 seconds in increments of 100ms Refer to the table below for actual bit settings Note that the default mode of operation is implemented by placing all zeroes in bits 13 through 17 In default mode the sample time period is 50ms and the RTS time out is inhibited Note that binary representation of the RTS bit strin
35. also use any storage bit in memory Module Programming 3 3 Program Action Rung 1 Block transfer read buffer the file to file move instruction holds the block transfer read BTR data file A until the processor checks the data integrity 1 If the data was successfully transferred the processor energizes the BTR done bit initiating a data transfer to the buffer file R for use in the program 2 If the data is corrupted during the BTR operation the BTR done bit is not energized and data is not transferred to the buffer file In this case the data in the BTR file will be overwritten by data from the next BTR Rungs 2 and 3 These rungs provide for a user initiated block transfer write BTW after the module is initialized at power up Pressing the pushbutton locks out BTR operation and initiates a BTW that configures the module Block transfer writes will continue for as long as the pushbutton remains closed Rungs 4 and 5 These rungs provide a read write read sequence to the module at power up They also insure that only one block transfer read or write is enabled during a particular program scan Rungs 6 and 7 These rungs the conditioning block transfer rungs Include all the input conditioning shown in the example program Publication 1771 6 5 129 March 2000 3 4 Module Programming PLC 3 Program Example BLOCK XFER READ Block Transfer RACK XXX Read Done Bit GROUP X 1 7 MODULE X
36. analog input and low voltage dc modules away from ac modules or high voltage dc modules to minimize electrical noise interference Do not place this module in the same I O group with a discrete high density I O module when using 2 slot addressing This module uses a byte in both the input and output image tables for block transfer Key the Backplane Connector Place your module in any slot in the chassis except the leftmost slot which is reserved for processors or adapters ATTENTION Observe the following precautions when inserting or removing keys insert or remove keys with your fingers make sure that key placement 15 correct Incorrect keying or the use of a tool can result in damage to the backplane connector and possible system faults C uu 2 EDU EP PN Connector Position the keying bands in the backplane connectors to correspond to the key slots on the module Place the keying bands between 10 and 12 0 B la 20 between 28 and 30 Upper 1 0 chassis You can change the position of these bands if nee subsequent system design and rewiring makes insertion of a different type of module necessary Install the Module and Field Wiring Arm ATTENTION Remove power from the 1771 I O chassis backplane before you install the module Failure to remove power from the backplane
37. apter you learned how to program your programmable controller You were given sample programs for your PLC 2 PLC 3 and PLC S family processors You also read about module scan time Publication 1771 6 5 129 March 2000 Chapter Objectives About Configuring Your RTD Module Chapter Al Configuring Your RTD Module In this chapter you will read how to configure your module s hardware condition your inputs and enter your data Because of the many analog devices available and the wide variety of possible configurations you must configure your module to conform to the analog device and specific application that you have chosen Data is conditioned through a group of data table words that are transferred to the module using a block transfer write instruction You can configure the following features for the 1771 IR series D module data format RTD type units of measure C F or ohms real time sampling calibration bias Configure your module for its intended operation by means of your programming terminal and write block transfers BTW Note Programmable controllers that use 6200 software programming tools can take advantage of the IOCONFIG utility to configure this module IOCONFIG uses menu based screens for configuration without having to set individual bits in particular locations Refer to your 6200 software literature for details During normal operation the processor transfers from 1 to 14
38. brating the module you must enter ladder logic into processor memory so that you can initiate write block transfers to the module and the processor can read inputs from the module Publication 1771 6 5 129 March 2000 Calibrating Your Module Words 9 through 14 in the write block transfer file are the module calibration words Word 9 corresponds to channel 1 word 10 to channel 2 and so on Each word is composed of two bytes the upper byte is for offset correction and the lower byte 5 for gain correction Refer to the table below Module Calibration Words RE SR EE s UN Enter the information for each byte in signed magnitude binary format In each byte the most significant bit bits 17 7 is a polarity bit When the polarity bit is set 1 the module anticipates a negative calibration value Word Bit A negative calibration value means that your readings are too high and you want to subtract corrective amount from that reading positive calibration value means that your readings are too low and you want to add a corrective amount to that reading Important If you have a spare field wiring arm you may want to temporarily switch it with the module s present wiring arm You can use this spare arm for test purposes in order to avoid disconnecting your RTD wiring Publication 1771 6 5 129 March 2000 Calibrating Your Module 6 7 Offset Calibration 1 Attach the 1 00 ohm 1
39. c est dire Classe 1 Division 2 Groupes A B C D sont certifi s l utilisation pour d autres quipements o la convenance de combinaison application ou utilisation est d termin e par la CSA ou le bureau local d inspection qualifi Important Par suite de la nature modulaire du syst me de contr le PLC le produit ayant le taux le plus lev de temp rature d termine le taux d ensemble du code de temp rature du syst me de contr le d un PLC dans un emplacement de Classe 1 Division 2 Le taux du code de temp rature est indiqu sur l tiquette du produit Taux du code de temp rature CLI DIV 2 GP A B C D SP _ TEMP Les avertissements suivants s appliquent aux produits ayant la certification CSA pour leur utilisation dans des emplacements dangereux Le taux du code de temp rature est indiqu ici AVERTISSEMENT Risque d explosion e La substitution de composants peut rendre ce mat riel inacceptable pour lesemplacements de Classe Division 2 Couper le courant ou s assurer quel emplacement est d sign non dangereux avant de remplacer lescomposants e Avant de d brancher l quipement couper le courant ou s assurer que l emplacement est d sign non dangereux Avant de d brancher les connecteurs couper le courant ou s assurer que l emplacement est reconnu non dangereux Attacher tous connecteurs fournis par l utilisateur et reli s aux circuits externes d un appareil All
40. ck transfer capability and the 1771 I O structure Contact your nearest Allen Bradley office for more information about your programmable controllers Product Compatibility This input module can be used with any 1771 I O chassis Communication between the discrete analog module and the processor is bidirectional The processor block transfers output data through the output image table to the module and block transfers input data from the module through the input image table The module also requires an area in the data table to store the read block and write block data I O image table use is an important factor in module placement and addressing selection The module s data table use is listed in the following table Compatibility and Use of Data Table Use of Data Table Compatibility Input Output Read Write Image Image Block Block Addressing Chassis Bits Bits Words Words 1 2 slot 1 slot 2 slot Series 1771 IR gt A Compatible with 1771 A1 A2 A4 chassis B Compatible with 1771 A1B A2B A3B A4B chassis Yes Compatible without restriction No Restricted to complementary module placement Catalog Number You can place your input module in any I O module slot of the I O chassis You can put two input modules in the same module group an input and an output module in the same module group Publication 1771 6 5 129 March 2000 Related Publications Using This Manual P 3 Do
41. ction after entering the instruction into your ladder diagram Bit Word Definitions for RTD Input Module bits 00 05 Description If any of these bits are set the corresponding input channel will be reported in ohms If RTDs other than 10 ohm copper or 100 ohm platinum are used you must report those channels in ohms not degrees Data format on a channel displayed in ohms will default to binary bits 06 07 Determines what units of measure the module reports Publication 1771 6 5 129 March 2000 Configuring Your RTD Module 4 5 Word Word 1 Cont Ohms Not used bit 08 10 In temperature mode 0 Entire module is platinum 1 Entire module is 10 ohm copper Enter exact value in word 2 In ohms mode 0 30mohm count resolution 1 10mohm count resolution bits 09 10 Data format bits tell module which format to use for reporting input 11 12 values to processsor Format 4 digit BCD 2 s complement binary Description D Signed magnitude binary bits 11 15 Real time sample bits See NO TAG 13 17 A Sample Time 0 1ms 0 5ms 0 7ms 1 0s 1 5s 2 0s 2 55 3 0s 1 0 Word 2 If bit 10 is set in word 1 and temperature readings are desired word 2 must also be used Enter the exact resistance of 10 ohm RTD at 259C in BCD Range is 9 00 to 11 00 ohms Values less than 9 00 ohms or greater than 11 00 ohms will default to 10 00 ohms Non BCD values will also defa
42. ctions Publication 1771 5 63 Table A A 1771 IR Series D Error Summary Based on Temperatures above 2009C Error 9 Calibration Drift RTD Type Range Temperature 259C eCJoC or OF OF over range Copper 200 to 260 C 328 to 500 F 0 344 C 0 564 F 0 1306 Platinum 200 to 870 C 328 to 1598 F 0 1000C 0 1520F 0 0717 Table A B 1771 IR Series D Resistance Error Summary RTD Type Resistance Error 25 C Resistance Drift over range Ohm C Platinum 0 075 ohm 0 0213 Publication 1771 6 5 129 March 2000 Appendix B Sample Programs for the RTD Input Module PLC 2 Family Processors Power Up Bit Programming Examples The following are sample programs for entering data in the configuration words of the write block transfer instruction when using the PLC 2 PLC 3 or PLC S family processors To enter data in the configuration words follow these steps NOTE For complete programming sample refer to Figure 4 1 Example Enter the following rung for a write block transfer BTW DATA ADDR MODULE ADDR BLOCK LENGTH FILE BLOCK XFER WRITE 030 06 110 110 DN 100 115 100 is the address of the write block transfer data file You want to examine configuration word 1 In RUN PROG Mode Action 1 Press SEARCH 8 lt data address 2 Press CANCEL COMMAND 3 Press DISPLAY O or 1 4 Press 51 Cursor defaults to first entry in file when SEARCH 51 is pressed
43. dwide representation E ee Argentina Australia Austria e Bahrain Belgium Brazil e Bulgaria Canada e Chile China PRC Colombia Costa Rica Croatia Cyprus e Czech Republic e Denmark e Ecuador e Egypt e El Salvador Finland e France e Germany e Greece e Guatemala e Honduras e Hong Kong Hungary Iceland India Indonesia e Ireland Israel Italy e Jamaica e Japan e Jordan e Korea e Kuwait e Lebanon e Malaysia Mexico e Netherlands New Zealand e Norway Pakistan Peru e Philippines e Poland Portugal e Puerto Rico e Qatar e Romania e Russia CIS e Saudi Arabia e Singapore e Slovakia e Slovenia e South Africa Republic e Spain e Sweden e Switzerland e Taiwan Thailand e Turkey e United Arab Emirates United Kingdom e United States Uruguay Venezuela e Yugoslavia Allen Bradley Headquarters 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Publication 1771 6 5 129 March 2000 PN955132 09 Copyright 1996 Allen Bradley Company Inc Printed in USA
44. electing Format for Reading Data FOND SR Units of Measure Heal Time Sampling Bit Settings for the Real Time Sample Mode Configuring Block for a Block Transfer Write Configuration Block for RTD Input Module Block Transfer Write Bit Word Descriptions Bit Word Definitions for RTD Input Module Default Configuration for the RTD Input Module Chapter es Chapter 5 Chapter Objectives Reading Data from the RTD Module Chapter SUmillaly oro nde Chapter 6 Chapter Objective Tools and Equipment Calibrating your Input Module About Auto calibration Performing Auto calibration Offset Calibration Write Block Transfer Word 15 Read Block Transfer Word9 Gain Calibration se Ire DRY iz Save Calibration Values Write Block Transfer Word 15 Performing Manual Calibration Module Calibration Words Offset Calibration
45. en Bradley de vis loquets coulissants connecteurs filet s ou autres moyens permettant aux connexions de r sister une force de s paration de 15 newtons 3 4 Ib 1 5 kg appliqu e pendant au moins une minute Le sigle CSA est la marque d pos e de l Association des Standards pour le Canada PLC est une marque d pos e de Allen Bradley Company Inc Publication 1771 6 5 129 March 2000 G 2 CSA Hazardous Location Approval Publication 1771 6 5 129 March 2000 A Accuracy 2 3 auto calibration gain 7 3 offset 7 2 performing 7 2 saving calibration values 7 5 B Bblock transfer read BTR word assignments 6 1 block transfer programming 4 1 block transfer read 6 1 bit word assignments 6 2 block transfer write configuration block 5 4 BTR word 9 7 3 BTW word 15 7 3 C cable length maximum 3 4 calibration auto calibration 7 1 tools 7 1 types of 7 1 words 7 6 communication with programmable controllers 2 2 Compatibility use of data table 1 3 configuration features 5 1 Configuring your module default for 1771 IR 5 6 configuring your module 5 1 bit word descriptions 5 5 word descriptions 5 4 contents what your package contains 2 3 D data format 5 2 data formats 2 s complement binary C 3 4 digit binary coded decimal C 1 signed magnitude binary C 2 default configuration 5 6 all zeroes 4 1 Index diagnostic indicators 3 6 diagnostics
46. g is the RTS period X 100ms For example 900msec 01001 9 X 100ms Bit Settings for the Real Time Sample Mode cale iz fae as a a3 Sample Time Period o 0 Rriihii 5ms po fo 0 ft 100ms EN 200ms EE E 300ms 1 400ms 500ms 600ms 700ms 800ms 900ms 1 0s 1 5s 2 0s 2 55 3 0s 3 1 sec Important Use decimally addressed bit locations for PLC 5 processors Publication 1771 6 5 129 March 2000 4 4 Configuring Your RTD Module Configuring Block for a The complete configuration block for the block transfer write to the Block Transfer Write module is defined in below Configuration Block for RTD Input Module Block Transfer Write ems Te Ts e Ts TT Te TS TT TT T wem spe suo ww Ew jou CI CICICICEC 1 Sample Time Data RTD Units of Single channel in ohms for RTS Format Type Measure 2 10 ohm resistance 25 C 3 Channel 1 Bias 4 Channel 2 Bias 5 Channel 3 Bias 6 Channel 4 Bias 7 Channel 5 Bias 8 Channel 6 Bias 9 Channel 1 calibration 10 Channel 2 calibration 11 Channel 3 calibration 12 Channel 4 calibration 13 Channel 5 calibration 14 Channel 6 calibration 15 Auto calibration request word Bit Word Descriptions Bit word descriptions of BTW file words 1 configuration 2 resistance value of 10 ohm copper RTDs 3 through 8 individual channel bias values and 9 through 14 individual channel calibration words are presented below Enter data into the BTW instru
47. ies to Series Series and D RTD Input Module cat no 1771 IR The customer applied 10 ohm resistance value 0 C is now 10 ohm resistance value 259C with a range of 9 00 to 11 00 ohms Calibration is now done automatically using the auto calibration feature or manually through programming Auto calibration is done at 1 00 ohm and 402 0 ohms Manual software calibration is done at 1 00 and 402 00 ohms not 18 83 and 375 61 ohms The module should be configured for platinum ohms display not temperature during the calibration procedure If EEPROM read of the auto calibration values fails BTR WORD 1 bit 7 is asserted RTS can be reduced to 100ms by programming RTS 1 The default RTS setting at power up is inhibited and data is available every 50ms for Series B was 300ms for Series A Backplane power is approximately 0 85A at 5V Series A was 1 0A at 5V Accuracy specifications over RANGE and TEMPERATURE are Typical Copper 4 91 Platinum 2 609C 0 82 Ohms User offset calibration range 15 1 29 ohms maximum Series was 3 81 ohms Offset correction is 10 2mohms bit User gain correction is now 0 00152588 LSB for a maximum of 0 193787 Multiple BTRs may occur before configuration of the module Publication 1771 6 5 129 March 2000 2 Differences Between Series Modules and Series B C and D Input Modules Publication 177
48. if valid before it is written over by the transfer of new data in a subsequent transfer 7 Your ladder program should allow write block transfers to the module only when enabled by the operator at power up Accuracy The accuracy of the input module is described in Appendix A Chapter Summary In this chapter you read about the functional aspects of the input module and how the module communicates with programmable controllers Publication 1771 6 5 129 March 2000 1 4 Overview of the RTD Input Module Publication 1771 6 5 129 March 2000 Chapter 2 Installing the RTD Input Module Chapter Objectives This chapter gives you information on calculating the chassis power requirement choosing the module s location in the I O chassis keying a chassis slot for your module wiring the input module s field wiring arm installing the input module Before You Install Your Before installing your input module in the I O chassis you must Input Module You need to Calculate the power requirements of all modules in each chassis Determine where to place the module in the 1 0 chassis As described under Power Requirements page 2 2 Module Location in the I O Chassis page 2 2 Key the backplane connector in the 1 0 chassis Module Keying page 2 3 Make connections to the wiring arm and ground Wiring Your Input Module page 2 4 and your module Grounding page 2 6 Prevent Electrostatic The RTD input module
49. k Problem s Type Describe Problem s Internal Use Only Technical Accuracy C text illustration Completeness procedure step illustration definition info in manual What information is missing L example C guideline L feature accessibility L explanation other info not in manual Clarity What is unclear Sequence What is not in the right order Other Comments Use back for more comments Your Name Location Phone Return to Marketing Communications Allen Bradley Co 1 Allen Bradley Drive Mayfield Hts OH 44124 6118 Phone 216 646 3176 216 646 4320 Publication ICCG 5 21 May 1990 PN 955107 82 1 4 Other Comments PLEASE FOLD HERE DE Aa POSTAGE WILL BE PAID BY THE ADDRESSEE Rockwell Automation Allen Bradley TECHNICAL COMMUNICATION 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124 9705 Publication 1771 6 5 129 March 2000 NO POSTAGE NECESSARY IF MAILED PLEASE REMOVE Rockwell Automation Allen Bradley a Rockwell Automation Business has been helping its customers improve productivity and quality for more than 90 years We design manufacture and support a broad Allen Bradley range of automation products worldwide They include logic processors power and motion control devices operator interfaces sensors and a variety of software Rockwell is one of the world s leading technology companies Worl
50. k transfer instruction A sample rung using multiple GET instructions is shown in Figure D 1 and described in the following paragraphs Rung 1 This rung is used to set four conditions Examine On Instruction 113 02 This is an optional instruction When used block transfers will only be initiated when a certain action takes place If you do not use this instruction block transfers will be initiated every I O scan First GET Instruction 030 120 identifies the module s physical address 120 by rack group and slot and where in the accumulated area of the data table this data is to be stored 030 Second GET Instruction 130 060 indicates the address of the first word of the file 060 that designates where the data will be transferred The file address is stored in word 130 100g above the data address Output Energize Instruction 012 07 enables the block transfer read operation If all conditions of the rung are true the block transfer read enable bit 07 is set in the output image data table control byte The output image table control byte contains the read enable bit and the number of words to be transferred The output energize instruction is defined as follows 70 indicates that it is an output instruction indicates the I O rack address 2 indicates the module group location within the rack 7077 indicates this is a block transfer read operation if this were a block transfer write o
51. le 7 A shows indications and probable causes and recommended actions to correct common faults Publication 1771 6 5 129 March 2000 7 2 Troubleshooting Table 7 A Troubleshooting Chart for the RTD Input Module 1771 IR D Indication Probable Cause Recommended Action Both LEDs are OFF No power to module Check power to I O chassis Recycle as Possible short on the module necessary LED driver failure Replace module Red FLT LED ON and Microprocessor oscillator or EPROM failure Replace module Green RUN LED is ON Red FLT LED ON If immediately after power up indicates RAM or Replace module EPROM failure If during operation indicates possible Replace module microprocessor or backplane interface failure Green RUN LED is flashing Power up diagnostics successfully completed Normal operation If LED continues to flash and write block transfers Check ladder logic program If correct BTW cannot be accomplished you have a replace module possible interface failure 1 When red LED is on the watchdog timer has timed out and backplane communications are terminated Your user program should monitor communication Status Reported in Words 1 and 2 Design your program to monitor status bits in words 1 and 2 and to take appropriate action depending on your application requirements You may also want to monitor these bits while troubleshooting with your industrial terminal The module sets a bit 1 to indicate it has
52. le PLC 5 Data File Hexidecimal Data Address 0 1 2 3 4 5 6 7 8 9 N7 60 5141 0976 0150 0150 0150 0150 0150 0150 0000 0000 N7 70 0000 0000 0000 0000 The above data file would configure the module as follow copper RTDs on all inputs temperature scale of Fahrenheit channel 1 displayed in ohms output data in BCD format real time sampling set to a 1 second scan rate copper RTD at 25 C is 9 76 ohms all bias values set to subtract 0150 all calibration values set to 0 3 Enter the data corresponding to your bit selections 4 ESC returns you to the main menu Appendix C Data Table Formats 4 Digit Binary Coded The 4 digit BCD format uses an arrangement of 16 binary digits to Decimal BCD represent a 4 digit decimal number from 0000 to 9999 figure C 1 The BCD format is used when the input values are to be displayed for operator viewing Each group of four binary digits is used to represent a number from 0 to 9 The place values for each group of digits are 20 2 22 and 23 NO TAG The decimal equivalent for a group of four binary digits is determined by multiplying the binary digit by its corresponding place value and adding these numbers Figure C 1 4 Digit Binary Coded Decimal 0X28 0 0X22 0 1X20 1 0X23 0 0X22 0 1X2 2 0x20 0X28 0 0X22 0 3 1 X 20 1 1 23 8 0 22 0 1X20 1 er f of of 1 1 2 3 9 12955 1 Publication 1771 6 5 12
53. lead distances less than 1000 feet use quality cable that has a small tolerance impedance rating 2 and 4 Wire RTD Sensors E 3 Connecting 4 Wire The illustration below shows how to connect 4 wire sensors to the Sensors field wiring arm of the RTD Input module A 4 wire sensor has two pairs of leads one pair for each resistor junction One wire of the 4 is not used it does not matter which one This leaves 3 wires one pair and one single wire You must connect the single wire to the terminal marked A You connect the remaining pair of wires to terminals B and C It doesn t matter which wire of the pair connects to terminal B and which wire connects to terminal C so long as all 3 wires are the same AWG gauge Connecting a 4 Wire Sensor to the Field Wiring Arm Terminal Identification Channel 1 Channel 2 Channel 3 Chassis Ground Single lead connects to terminal A Leave 1 lead open Channel 5 Channel 6 Note In this illustration Terminal A is the 1mA excitation sourcing current Terminal B is the lead compensation sense input Terminal C is common B B B 4 B B 12935 1 Publication 1771 6 5 129 March 2000 E 4 2 and 4 Wire RTD Sensors Publication 1771 6 5 129 March 2000 Appendix F Differences Between Series A RTD Modules and Series B C and D RTD Input Modules Major Differences between The following is a list of major changes from Ser
54. module is alive but not yet configured Bit 07 EEPROM calibration values could not be read Bits 08 13 Overrange bits are set when the input is above the normal operating 10 15 range Bit 10 for input 1 bit 11 for input 2 etc See Table 5 C Bit 14 16 Real time sample time out bit See page 5 2 Bit 15 17 Not used Word 2 Bit 00 05 When set indicates that default bias has been subtracted from the input value Only the remainder is shown in the data word Each bit relates to a single channel bit 00 for input 1 etc Default bias is automatically applied when BCD formatted data cannot be displayed This will occur when measuring temperatures in Fahrenheit larger than 999 9 degrees The default bias value which is subtracted is 1000 0 Bits 06 07 Not used Bits 08 13 Sign bits for each channel When set indicate that a certain input is 10 15 negative Bit 10 corresponds to input 1 bit 11 to input 2 etc These bits are used for BCD and signed magnitude data formats Bits 14 15 Not used 16 17 Words 3 8 Bits 00 15 Input data words The data words must be multiplied or divided by a 00 17 factor if whole numbers need to be displayed If you are reading temperature F or C Then there is an implied decimal point XXX X after the least significant digit Resolution is 0 19 If you are reading resistance in milliohms copper RTDs BTW word 1 bit 10 1 Then there is an implied decimal point XXX XX If you
55. n Publication 1771 6 5 129 March 2000 Installing the RTD Input Module 2 5 Terminal Connection Diagram for the RTD Input Module 1771 IR D Identification Channel 1 C B A 2 C B Functional Ground 3 C B A 4 C B A 5 C B A 6 C B Refer to Appendix E for 2 wire and 3 wire RTD connections A Field Wiring Arm Cat No 1771 WF 118464 T The sensor cable must be shielded The shield must e extend the length of the cable but be connected only at the 1771 I O chassis e extend up to the point of termination Important The shield should extend to the termination point exposing just enough cable to adequately terminate the inner conductors Use heat shrink or another suitable insulation where the wire exits the cable jacket Cable impedance Since the operating principle of the RTD module is based on the measurement of resistance you must take special care in selecting your input cables Select a cable that has a consistent impedance throughout its entire length We recommend Belden 9533 or equivalent As cable length is directly related to overall cable impedance keep input cables as short as possible by locating your I O chassis as near the RTD sensors as I O module considerations permit Keep the cable free of kinks and nicks to the shielding material Publication 1771 6 5 129 March 2000 2 6 Installing the RTD Input Module Ground the Chassis and Module Use the following diagrams to ground
56. nd block transfer read BTR instructions in your ladder diagram program These instructions let the processor obtain input values and status from the module and let you establish the module s mode of operation see below 1 The processor transfers your configuration data and calibration values to the module using a block transfer write instruction 2 External devices generate analog signals that are transmitted to the module Communication Between Processor and Module 06060 BTW 1 e 6 emory RTD 7 User Program LA f To Output Devices BI a 2 m 10 BTR4 KH E ah d RTD Input Module 1771 IR Series B Publication 1771 6 5 129 March 2000 PC Processor PLC 5 40 Shown 12933 1 3 The module converts analog signals into binary or BCD format and stores theses values until the processor requests their transfer 4 When instructed by your ladder program the processor performs a read block transfer of the values and stores them in a data table Overview of the RTD Input Module 1 3 5 The processor and module determine that the transfer was made without error and that input values are within specified range 6 Your ladder program can use and or move the data
57. not use this module with Cat No 1771 AL adapter PLC 2 20 or 2 30 programmable controllers Do not put the module in the same module group as a discrete high density module unless you are using 1 or 1 2 slot addressing Avoid placing this module close to AC modules or high voltage DC modules For a list of publications with information on Allen Bradley programmable controller products consult our publication index SD499 Publication 1771 6 5 129 March 2000 P 4 Using This Manual Publication 1771 6 5 129 March 2000 Overview of the RTD Input Module Installing the RTD Input Module Module Programming Table of Contents Chapter 1 Chapter Objectives 1 1 Module Description 1 1 Features of the Input Module 1 1 How Analog Modules Communicate with Programmable Controllers 1 2 Communication Between Processor and Module 1 2 POCUACY gemi Sed MORIS 1 3 Chanter Summary 1 3 2 Chapter Objectives 2 1 Before You Install Your Input Module 2 1 Prevent Electrostatic Discharge 2 1 Understand Compliance to European Union Directives 2 1 EMG DIIBCIWG ces ee oes her due 2 2 Low Voltage Directive 2 2 Calculate Power Requirements
58. nstalling the RTD Input Module Publication 1771 6 5 129 March 2000 Chapter Objectives Block Transfer Programming Chapter 3 Module Programming In this chapter we describe Block Transfer programming Sample programs in the PLC 2 PLC 3 and PLC S processors Module scan time issues Your module communicates with the processor through bidirectional block transfers This is the sequential operation of both read and write block transfer instructions The block transfer write BTW instruction is initiated when the analog module is first powered up and subsequently only when the programmer wants to write a new configuration to the module At all other times the module is basically in a repetitive block transfer read BTR mode The following example programs accomplish this handshaking routine These are minimum programs all rungs and conditioning must be included in your application program You can disable BTRs or add interlocks to prevent writes if desired Do not eliminate any storage bits or interlocks included in the sample programs If interlocks are removed the program may not work properly Your analog input module will work with a default configuration of all zeroes entered in the configuration block See the configuration default section to understand what this configuration looks like Also refer to Appendix B for example configuration blocks and instruction addresses to get started Your program should
59. o calibration Status Word ol oo Chapter 5 Module Status and Input Data In this chapter you will read about reading data from your module input module read block format Block transfer read programming moves status and data from the input module to the processor s data table in one I O scan The processor user program initiates the request to transfer data from the input module to the processor During normal operation the read block transfer for this module moves up to 8 words from the RTD module in one program scan The words contain module status and input data from each channel When a block transfer length of 0 is programmed the 1771 IR D will respond with the Series A default of 8 words The user program initiates the request to transfer data from the RTD module to the processor Figure 5 1 BTR Word Assignments for RTD Input Module 1771 IR D up Channel Underrange EEPROM calibration values not readable Power Channel Overrange Publication 1771 6 5 129 March 2000 5 2 Module Status and Input Data Table 5 A a Bit Word Description for RTD Input Module 1771 IR Series D Word Definition Word 1 Bits 00 05 Underrange indication for each channel set when input is below the normal operating range for copper or platinum RTD Bit 00 for input 1 bit 01 for input 2 etc See Table 5 B Bit 06 Power up bit is set when the
60. or the area is known to be non hazardous Do not disconnect connectors unless power has been switched off or the area is known to be non hazardous Secure any user supplied connectors that mate to external circuits on an Allen Bradley product using screws sliding latches threaded connectors or other means such that any connection can withstand a 15 Newton 3 4 Ib separating force applied for a minimum of one minute CSA logo is a registered trademark of the Canadian Standards Association PLC is a registered trademark of Allen Bradley Company Inc Approbation d utilisation dans des emplacements dangereux par la CSA La CSA certifie les produits d utilisation g n rale aussi bien que ceux qui S utilisent dans des emplacements dangereux La certification CSA en vigueur est indiqu e par l tiquette du produit et non par des affirmations dans la documentation l usage des utilisateurs Exemple d tiquette de certification d un produit par la CSA CLI DIV 2 GP A B C D Pour satisfaire la certification de la CSA dans des endroits dangereux les informations suivantes font partie int grante de la documentation des produits industriels de contr le Allen Bradley certifi s par la CSA e Cet quipement convient l utilisation dans des emplacements de Classe 1 Division 2 Groupes A B C D ou ne convient qu l utilisation dans des endroits non dangereux Les produits portant le marquage appropri de la CSA
61. peration 07 would be replaced by 06 Publication 1771 6 5 129 March 2000 D 2 Block Transfer Mini PLC 2 and PLC 2 20 Processors Output Image Table Timer Counter Accumulated Values Area Timer Counter Preset Values Area Multiple GET Instructions 113 030 130 Rung 1 02 120 060 Rung 2 Rung 3 Publication 1771 6 5 129 March 2000 Rungs 2 and 3 These output energize instructions 012 01 and 012 02 define the number of words to be transferred This is accomplished by setting a binary bit pattern in the module s output image table control byte The binary bit pattern used bits 01 and 02 energized is equivalent to 6 words or channels and is expressed as 110 in binary notation Rung Summary Once the block transfer read operation is complete the processor automatically sets bit 07 in the input image table status byte and stores the block length of the data transferred Figure D 1 Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors Only 010 Output Image Table al UE 012 Control Byte Contains Read Enable Bit and Block 017 Length in Binary Code Data Table 027 Data Address 030 Contains Module Address in BCD First Address 060 Destination of Transferred Data 065 110 1 EE ee Input Image Table 112 Status Byte 117 Contains Done Bit Storage Location 0 107 Cri Address in BCD R Read 07
62. rated channel bits bits 10 15 of BTR word 9 are set a save cannot occur Auto calibration should be performed again starting with offset calibration If the module has a faulty channel the remaining functioning channels can be calibrated by inhibiting calibration on the faulty channel The module can be run with the new calibration values but will lose them on power down To save these values proceed as follows 1 Request a save to EEPROM by setting bit 02 in BTW word 15 and sending the BTW to the module see below Write Block Transfer Word 15 Requested Auto Calibration Requested 5 3 2 Set these bits to 0 Save pes Requested Values ain Cal Offset Cal 2 Queue BTRs to monitor for save complete EEPROM fault and calibration fault An EEPROM fault indicates a nonoperative a calibration fault indicates at least one channel was not properly offset or gain calibrated and a save did not occur Note During normal operation make sure bits 00 01 and 02 of BTW word 15 are zero 0 You calibrate each channel by applying a precision resistance across each channel comparing correct with actual results and entering correction into the corresponding calibration word for that channel The correction takes affect after it is transferred to the module by the corresponding BTW instruction in your ladder diagram program Always start with offset adjustment followed by gain adjustment Before cali
63. rview of the topics covered in that chapter Title Topics Covered Overview of the Input Module Description of the module including general and hardware features Installing the Input Module Module power requirements keying chassis location Wiring of field wiring arm Module Programming How to program your programmable controller for these modules Sample programs Module Configuration Hardware and software configuration Module write block format Module Status and Input Data Reading data from your module Module read block format Module Calibration How to calibrate your module Diagnostics reported by the module Your module s specifications Programming Examples Publication 1771 6 5 129 March 2000 P 2 Using This Manual Appendices Appendix C Data Formats Information on BCD signed magnitude 12 bit binary and 25 complement binary Appendix D Block Transfer with Mini PLC 2 How to use GET GET instructions for block transfer with Mini PLC 2 and Mini PLC 2 20 and Mini PLC 2 20 processors Appendix E 2 and 4 wire RTD Sensors Shows wiring connections for 2 and 4 wire sensors Appendix F Differences Between Series A B Identifies major differences between the series A B C and D of the and D RTD module Appendix G CSA Hazardous Location Certification information for CSA Approval Related Products You can install your input module in any system that uses Allen Bradley programmable controllers with blo
64. ser s Manual will work without modification presuming the transducer is polarity insensitive Allowable ambient temperature change to maintain accuracy is 1 C min Series B C and D 8 8 out 8 read words 14 write words 8 8 out 9 read words 15 write words 18 4 to 400 00 ohms 1 00 to 600 00 ohms lt 50 megohms shunted by lt 4700pF Greater than 10 megohms 40V rms continuous 120V rms continuous 50ms for 6 channels 50ms for 6 channels 50ms to 3 15 Yes Uses Block Transfer Write word 15 Open excitation terminal A to overrange lt 0 5sec Open common terminal C to underrange lt 0 5sec Open sense terminal B drift high 4 75W maximum 16 2 BTU hr CSA certified CSA Class Division 2 Groups B C D certified UL listed CE marked for all applicable directives Series D C Tick marked for all applicable acts 5 0W maximum 15 0 BTU hr CSA certified CSA Class Division 2 Groups B C D certified UL listed Publication 1771 6 5 129 March 2000 F 4 Differences Between Series A RTD Modules and Series B C and D RTD Input Modules Publication 1771 6 5 129 March 2000 Appendix G CSA Hazardous Location Approval CSA Hazardous Location Approval certifies products for general use as well as for use in hazardous locations Actual CSA certification is indicated by the product label as shown below and not by statements in any user documentation Example of
65. th report in ohms only Temperature in C Temperature in F RTD resistance in ohms 10milliohms or 30millionms resolution Platinum 200 to 870 C 328 to 1598 F Copper 200 to 260 C 328 to 500 F 1 00 to 600 00 ohms Platinum 0 1 C 0 19F Copper 0 3 C 0 5 F 1mA constant current source supplied by module 120db 60Hz up to 1000V peak Greater than 10 megohms 60db 9 60Hz 120V rms continuous Open excitation terminal A to overrange 0 5sec Open common terminal C to underrange 0 5sec Open sense terminal B drift high 50ms for 6 channels This isolation meets or exceeds the requirements of UL Standard 508 and CSA Standard C22 2 No 142 950mA at 5V 4 75W maximum 16 2 BTU hr 0 to 60 C 32 to 140 F Ambient changes greater than 1 0 C minute may temporarily degrade performance during periods of change 40 to 859C 40 to 1859F 5 to 9596 noncondensing 5 to 9596 noncondensing 50ppm C of full scale range Publication 1771 6 5 129 March 2000 2 Specifications Description Keying Field Wiring Arm Wiring Arm Screw Torque Agency Certification when product is marked Value Between 10 and 12 Between 28 and 30 Cat No 1771 WF 7 9 pound inches CSA certified CSA Class Division 2 Groups A B C D certified UL listed CE marked for all applicable directives C Tick marked for all applicable acts Publications Installation Instru
66. ult to 10 00 ohms Words 3 8 Individual channel bias words entered in BCD This value is subtracted from the channel data in the BTR The bias value is always a positive number Bias value range is 0 lt bias lt 9999 Words 9 14 FP Individual channel calibration words Publication 1771 6 5 129 March 2000 4 6 Configuring Your RTD Module Word Description Word 15 Auto calibration request word used to automatically calibrate selected channels and save the calibration constants in EEPROM Bit 00 Offset calibration complete Bit 01 Gain calibration complete Bit 02 Save complete Bit 06 EEPROM fault Bit 07 Faulty calibration no save Bits 08 15 Channel failed calibration 10 17 Default Configuration for If zeroes are written to the module in all configuration positions the the RTD Input Module module will default to BCD format 100 ohm platinum RTD temperature in degrees real time sampling inhibited sample time 50ms Chapter Summary In this chapter you learned how to configure your module s hardware condition your inputs and enter your data Publication 1771 6 5 129 March 2000 Chapter Objectives Reading Data from the RTD Module T To V Te CI CA 9 Sem r e pepe n v CS 1 RTS Timeout Notused Channel Polarity Not used Channel Overflow Channel 1 Data Channel 2 Data Channel 3 Data Channel 4 Data Channel 5 Data Channel 6 Data Aut
67. words to the module when you program a BTW instruction to the module s address The BTW file contains configuration words bias values and calibration values that you enter for each channel When a block transfer length of 0 is programmed the 1771 IR D will respond with the Series A default of 14 Publication 1771 6 5 129 March 2000 4 2 Configuring Your RTD Module Data Format You must indicate what format will be used to read data from your module Typically BCD is selected with PLC 2 processors and binary also referred to as integer or decimal is selected with PLC 3 and PLC S processors See below and Appendix C for details on Data Format Selecting Format for Reading Data Decimal Bit 10 Decimal Bit 9 Octal Bit 12 Octal Bit 11 Data Format 0 0 2 s complement binary 1 Signed magnitude binary 1 Same as signed magnitude binary RTD Type The RTD input module accepts the following types of RTD inputs Platinum Temperature Range eur LEZ 200 to 870 C 328 to 1598 F 200 to 260 C 328 to 500 F 20 327 67 260 Units of The units of measure reported by the RTD module are selected by setting bits 06 07 in BTW word 1 Units of Measure Degrees C Degrees F Not used If any of bits 0 5 are set 1 the corresponding input channel will be reported in ohms Publication 1771 6 5 129 March 2000 Real Time Sampling Configuring
68. y be damaged or economic loss can occur if procedures are not followed properly Warnings and Cautions Identify a possible trouble spot Tell what causes the trouble Give the result of improper action Tell the reader how to avoid trouble Important We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss 1991 Allen Bradley Company Inc PLC is a registered trademark of Allen Bradley Company Inc Purpose of Manual Audience Vocabulary Manual Organization Chapter 1 2 7 Appendices Appendix Appendix B Preface Using This Manual This manual shows you how to use your RTD input module with an Allen Bradley programmable controller It helps you install program calibrate and troubleshoot your module You must be able to program and operate an Allen Bradley programmable controller PLC to make efficient use of your input module In particular you must know how to program block transfer instructions We assume that you know how to do this in this manual If you do not refer to the appropriate PLC programming and operations manual before you attempt to program this module In this manual we refer to The RTD input module as the input module The Programmable Controller as the controller This manual is divided into eight chapters The following chart shows each chapter with its corresponding title and a brief ove
69. your chassis and isolated analog input module Follow these steps to prepare the cable Remove a length of cable jacket from the Belden 8761 cable ae Belden 8761 Cable Pull the foil shield and bare drain wire from the insulated wires Bare drain Insulated wires Twist the foil shield and drain wire together to form a single strand Attach ground lug When using shielded cable wire ground the foil shield and drain wire only at one end of the cable We recommend that you wrap the foil shield and drain wire together and connect them to a chassis mounting bolt At the opposite end of the cable tape exposed shield and drain wire with electrical tape to insulate it from electrical contact Refer to Wiring and Grounding Guidelines publication 1770 4 1 for additional information Publication 1771 6 5 129 March 2000 Chassis Ground When you connect grounding conductors to the I O chassis grounding stud place a star washer under the first lug then place a nut with captive lock washer on top of each ground lug Ground Lug Nut Nut and Captive 4 Washer Grounding Stud D j St Nube Ground Lug Chassis Side Plate Shield and Drain twisted together 1Use the cup washer if crimp on lugs are not used Single point Grounding Extend shield to termination point Expose just enough cable to adequately terminate inner conductors

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