RTD Input Module Cat. No.
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).
Table of Contents Important User Information . . . . . . . . . . . . . . . . . . . . . . . . I Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 Purpose of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Organization . . . . . . . . . . . . . . . . . .
ii Table of Contents Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7 Module Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1 Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuring Your RTD Module . . . . . . . . . . . . . . . . . . . . . . . . . . . Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RTD Type . . . . . . . . . . . . . . . . . . . . . .
Table of Contents iii Data Table Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C 1 4-Digit Binary Coded Decimal (BCD) . . . . . . . . . . . . . . . . . . . . . . Signed-magnitude Binary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two's Complement Binary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C 1 C 2 C 3 Block Transfer (Mini-PLC-2 and PLC-2/20 Processors) . .
Chapter Using This Manual Purpose of 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. Audience 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.
Chapter 1 Using This Manual Chapter Title Topics Covered Appendix A Specifications Appendix B Programming Examples Appendix C Data Formats Information on BCD, signed magnitude (12-bit) binary, and 2's complement binary Appendix D Block Transfer with Mini-PLC-2 and Mini-PLC-2/20 How to use GET-GET instructions for block transfer with Mini-PLC-2 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 Se
Chapter 1 Using This Manual Table 1.A Compatibility and Use of Data Table Catalog Number 1771-IR Series B Input Image Bits 8 Use of Data Table Output Read Image Block Bits Words 8 8/9 Write Block Words 14/15 Compatibility 1/2 -slot Yes Addressing Chassis 1-slot 2-slot Series Yes Yes A and B A = Compatible with 1771-A1, A2, A4 chassis. B = Compatible with 1771-A1B, A2B, A3B, A4B chassis.
Chapter Chapter 2 2 Overview of the RTD Input Module Chapter Objectives This chapter gives you information on: features of the input module how an input module communicates with programmable controllers Module Description 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.
Chapter 2 Overview of the RTD Input Module How Analog Modules Communicate with Programmable Controllers The processor transfers data to and from the module using block transfer write (BTW) and 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 (figure 2.1). 1.
Chapter 2 Overview of the RTD Input Module 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. Getting Started Your input module package contains the following items. Please check that each part is included and correct before proceeding. RTD Input Module Cat. No.
Chapter 3 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 Input Module Before installing your input module in the I/O chassis you must: Action required: Electrostatic Damage Refer to: Calculate the power requirements of all modules in e
Chapter 3 Installing the RTD Input Module Power Requirements Your module receives its power through the 1771 I/O chassis backplane from the chassis power supply. The maximum drawn by the RTD module from this supply is 850mA (4.2 Watts). Add the listed value to the requirements of all other modules in the I/O chassis to prevent overloading the chassis backplane and/or backplane power supply.
Chapter 3 Installing the RTD Input Module Figure 3.1 Keying Positions for the RTD Input Module Keying Bands 2 4 6 8 1 1 1 1 1 2 2 2 2 2 3 3 3 3 0 2 4 6 8 0 2 4 6 8 0 2 4 6 Upper Connector Connecting Wiring Between 10 and 12 Between 28 and 30 12934 Connect your I/O devices to the field wiring arm shipped with the module (see Figure 3.2). Attach the field wiring arm to the pivot bar at the bottom of the I/O chassis.
Chapter 3 Installing the RTD Input Module Figure 3.2 Connection Diagram for RTDs 18 16 14 RTD 12 Chassis Ground 10 8 6 4 2 C B A C B A C B A C B A C B A C B A Terminal Identification Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 12935 Most importantly, you must ground the shield at the chassis end only. We recommend connecting each input cable’s shield to a properly grounded common bus. Refer to Appendix E for 2–wire and 4–wire RTD connections.
Chapter 3 Installing the RTD Input Module Grounding the Input Module When using shielded cable, 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 (Figure 3.3). At the opposite end of the cable, tape exposed shield and drain wire with electrical tape to insulate it from electrical contact. Figure 3.
Chapter 3 Installing the RTD Input Module Interpreting the Indicator Lights 2. Place the module in the plastic tracks on the top and bottom of the slot that guides the module into position. 3. Do not force the module into its backplane connector. Apply firm even pressure on the module to seat it properly. 4. Snap the chassis latch over the top of the module to secure it. 5. Connect the wiring arm to the module.
Chapter Module Programming Chapter Objectives In this chapter, we describe Block Transfer programming Sample programs in the PLC–2, PLC–3 and PLC–5 processors Module scan time issues Block Transfer Programming Your module communicates with the processor through bidirectional block transfers. This is the sequential operation of both read and write block transfer instructions.
Chapter 4 Module Programming PLC-2 Program Example 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 4.
Chapter 4 Module Programming 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.
Chapter 4 Module Programming PLC-3 Program Example 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.
Chapter 4 Module Programming After this single block transfer write is performed, the module returns to continuous block transfer reads automatically.
Chapter 4 Module Programming PLC-5 Program Example The PLC–5 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 4.
Chapter 4 Module Programming 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 Figure 4.4. The following description references the sequence numbers in Figure 4.4.
Chapter Module Configuration Chapter Objectives In this chapter you will read how to configure your module’s hardware, condition your inputs and enter your data. Configuring Your RTD Module 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.
Chapter 5 Module Configuration 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–5 processors. See Table 5.A and Appendix C for details on Data Format. Table 5.
Chapter 5 Module Configuration Real Time Sampling 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 ( ∆T) instead of the default interval.
Chapter 5 Module Configuration Configuring Block for a Block Transfer Write The complete configuration block for the block transfer write to the module is defined in Table 5.C below. Table 5.
Chapter 5 Module Configuration 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 instruction after entering the instruction into your ladder diagram. Table 5.
Chapter 5 Module Configuration Word Bits Description Word 1 (cont.) Default Configuration for the RTD Input Module 1.5 0 1 1 1 1 2.0 1 0 1 0 0 2.5 1 1 0 0 1 3.0 1 1 1 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 25oC 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 default to 10.
Chapter 6 Module Status and Input Data Chapter Objectives In this chapter you will read about: reading data from your module input module read block format Reading Data from the RTD Module Block transfer read programming moves status and data from the input module to the processor’s data table in one I/O scan (Table 6.A). The processor user program initiates the request to transfer data from the input module to the processor.
Chapter 6 Module Status and Input Data Table 6.B Bit/Word Description for RTD Input Module (1771-IR Series B) Word Bit 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 6.C. Bit 06 Power-up bit is set when the module is alive but not yet configured. Bit 07 EEPROM calibration values could not be read.
Chapter 6 Module Status and Input Data Word Bit Definition Word 9 (cont.) Bit 07 Faulty calibration (no save) Bits 10-15 Channel failed calibration. Bit 10 for input 1, bit 11 for input 2, etc. Table 6.C Overrange and Underrange Values Indication BTW Word 1, Bit 10 RTD Underrange 0 Platinum Overange Underrange Overrange Chapter Summary 1 Copper Ohms oC oF < 1.00 < -200 < -328 > 600.00 > 870 > 1598 < 1.00 < -200 < -328 > 327.
Chapter Module Calibration Chapter Objective In this chapter we tell you how to calibrate your modules. Tools and Equipment In order to calibrate your input module you will need the following tools and equipment: Tool or Equipment Description Model/Type Available from: Industrial Terminal and Interconnect Cable Programming terminal for A-B family processors Cat. No. 1770-T3 or Cat. No. 1784-T45, -T50, etc. Allen-Bradley Company Highland Heights, OH Precision Resistors 1.
Chapter 7 Module Calibration Performing Auto-calibration Calibration of the module consists of applying 1.00 ohm resistance across each input channel for offset calibration, and 402.00 ohm across each input channel for gain correction. 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 7.1. Figure 7.
Chapter 7 Module Calibration Table 7.A Write Block Transfer Word 15 Word Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 Inhibit Calibration on Channel Word 15 Set these bits to 0 6 5 4 3 2 02 01 00 Requested Auto-Calibration 1 Set these bits to 0 Requested Requested Save Gain Cal. Values Requested Offset Cal. NOTE: Normally, all channels are calibrated simultaneously (bits 10–15 of word 15 are octal 0).
Chapter 7 Module Calibration Figure 7.2 Resistor Location for Gain Calibration 18 Repeat for each channel 16 402.0 ohm Resistor 14 12 10 8 6 4 2 C B A C B A C B A C B A C B A C B A Terminal Identification Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 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. Refer to Table 7.A.
Chapter 7 Module Calibration Save Calibration Values If any ”uncalibrated 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.
Chapter 7 Module Calibration Table 7.C Module Calibration Words Word/Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 9 S Channel 1 Offset S Channel 1 Gain 10 S Channel 2 Offset S Channel 2 Gain 11 S Channel 3 Offset S Channel 3 Gain 12 S Channel 4 Offset S Channel 4 Gain 13 S Channel 5 Offset S Channel 5 Gain 14 S Channel 6 Offset S Channel 6 Gain 01 00 Enter the information for each byte in signed magnitude binary format.
Chapter 7 Module Calibration is, you want to subtract 47 counts from your input data. The lower byte remains 00 during offset calibration. 5. Repeat above steps for channels 2 through 6 respectively. 6. 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 7.2. 2. Place the module in platinum ohm mode. This provides 30 mohm resolution display. 3. Examine word 3 of the read block transfer data file.
Chapter 7 Module Calibration 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 7.D. You would enter 10100111 in the lower byte of word 9.
Chapter 8 Troubleshooting Chapter Objective We describe how to troubleshoot your module by observing LED indicators and by monitoring status bits reported to the processor.
Chapter 8 Troubleshooting Table 8.A shows LED indications and probable causes and recommended actions to correct common faults. Table 8.A Troubleshooting Chart for the RTD Input Module (1771-IR/B) Indication Probable Cause Recommended Action Both LEDs are OFF No power to module Possible short on the module LED driver failure Check power to I/O chassis. Recycle as necessary. Replace module. Red FLT LED ON and Green RUN LED is ON Microprocessor, oscillator or EPROM failure Replace module.
Chapter 8 Troubleshooting Word Bit 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. 2 Indication 00-05 Indicates that the default bias of 1000.0 has been subtracted from the measured value.
Appendix A Specifications Module Capacity Six RTD input channels Module Location 1771 I/O Chassis Sensor Type 100 ohm platinum (alpha = 0.00385) or 10 ohm copper (alpha = 0.00386) Other types may be used with report in ohms only Units of measure Temperature in oC Temperature in oF RTD resistance in ohms (10milliohms or 30milliohms resolution) Temperature Range Platinum: -200 to +870oC (-328 to 1598oF) Copper: -200 to +260oC (-328 to +500oF) Resistance Range 1.00 to 600.
Appendix A Specifications Table A.A 1771-IR Series B Error Summary Based on Temperatures above -200oC RTD Type Range Error @ Calibration Temperature (25oC) (over range) Copper -200 to +260oC (-328 to +500oF) +0.344oC/+0.564oF +0.1306 Platinum -200 to +870oC (-328 to 1598oF) +0.100oC/+0.152oF +0.0717 Table A.B 1771-IR Series B Resistance Error Summary A-2 Drift oC/oC or oF/oF RTD Type Resistance Error @ 25oC (over range) Resistance Drift Ohm/oC Copper +0.074 ohm +0.0213 Platinum +0.
Appendix Programming Examples Sample Programs for the RTD Input Module 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–5 family processors. PLC-2 Family Processors To enter data in the configuration words, follow these steps. NOTE: For complete programming sample, refer to Figure 4.1.
Appendix B Programming Examples In PROG Mode Action Result 1. Press [SEARCH]8 Finds the block transfer instruction 2. Press CANCEL COMMAND Removes preceeding command 3. Press [DISPLAY]0 or 1 Displays the file in binary or BCD 4. Press [DISPLAY]001 and enter data Puts cursor on word 1 5. Press [INSERT] Use the above procedure to enter the required words of the write block transfer instruction.
Appendix B Programming Examples PLC-3 Family Processors Following is a sample procedure for entering data in the configuration words of the write block transfer instruction when using a PLC–3 processor. For a complete sample program, refer to Figure 4.2.
Appendix B Programming Examples 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]. Figure B.
Appendix B Programming Examples Figure B.3 Sample PLC-5 Data File (Hexidecimal Data) Address N7:60 N7:70 0 1 2 3 4 5 6 7 5141 0000 0976 0000 0150 0000 0150 0000 0150 0150 0150 0150 8 9 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 25oC is 9.
Appendix Data Table Formats 4-Digit Binary Coded Decimal (BCD) The 4–digit BCD format uses an arrangement of 16 binary digits to 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, 21, 22 and 23 (Table C.A).
Appendix C Data Formats Table C.A BCD Representation 23 (8) Signed-magnitude Binary Place Value 22 (4) 21 (2) Decimal Equivalent 20 (1) 0 0 0 0 0 0 0 0 1 1 0 0 1 0 2 0 0 1 1 3 0 1 0 0 4 0 1 0 1 5 0 1 1 0 6 0 1 1 1 7 1 0 0 0 8 1 0 0 1 9 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.
Appendix C Data Formats Two's Complement Binary 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. 101102 = 2210 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.
Appendix D Block Transfer (Mini-PLC-2 and PLC-2/20 Processors) Multiple GET Instructions 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.
Appendix D Block Transfer (Mini-PLC-2 and PLC-2/20 Processors) 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.
Appendix D Block Transfer (Mini-PLC-2 and PLC-2/20 Processors) Figure D.
Appendix D Block Transfer (Mini-PLC-2 and PLC-2/20 Processors) Setting the Block Length (Multiple GET Instructions only) The input module transfers a specific number of words in one block length. The number of words transferred is determined by the block length entered in the output image table control byte corresponding 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.
Appendix D Block Transfer (Mini-PLC-2 and PLC-2/20 Processors) Figure D.
Appendix E 2 and 4-Wire RTD Sensors About 2 and 4-Wire Sensors You can connect 2–wire and 4–wire sensors to the RTD module. 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 in Figure E.1. Figure E.
Appendix E 2 and 4-Wire Sensors Figure E.2 Connections for 3 and 4-Wire Sensors C B A 3-Wire Sensor C B A 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 lead distances less than 1000 feet use quality cable that has a small tolerance impedance rating. Connecting 4-Wire Sensors E 2 Figure E.3 shows how to connect 4–wire sensors to the field wiring arm of the RTD Input module.
Appendix E 2 and 4-Wire Sensors Figure E.
Appendix F Differences Between Series A and Series B RTD Input Modules Major Differences between Series The following is a list of major changes from Series A to Series B RTD Input Module (cat. no. 1771–IR). The customer applied “10 ohm resistance value @ 0oC” is now “10 ohm resistance value @ 25oC” 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.
Appendix F Differences between Series A and Series B 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.
Appendix F Differences between Series A and Series B 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. The excitation current on Series B flows out of termination A. The excitation current on the series A flowed into termination A.
Index 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 c
I–2 Index P S Power requirements, 3 2 scan time, 4 7 pre-installation considerations, 3 1 sensors about 2 and 4-wire, E 1 connecting 4-wire, E 2 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, PLC-2, PLC-3, PLC-5, sample B 1 B 3 B 4 R real time sampling, 5 3 bit settings, 5 3 resistance, cable impedance, 3 4 RTD input module, features, 2 1 specifications, A-1 error summary, A-2 T troubleshooting, table, 8 2 types of RTDs
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