Allen-Bradley B Series User Manual
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Allen-Bradley B Series User Manual

Allen-Bradley B Series User Manual

Thermocouple/mv isolated input module
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See also: User Manual , Instruction and Installation Manual
Allen-Bradley
Thermocouple/mV
Isolated Input
Module
(Cat. No. 1746-INT4 Series B)
Allen-Bradley
User
Manual

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  • Page 1 Allen-Bradley User Thermocouple/mV Isolated Input Manual Module (Cat. No. 1746-INT4 Series B) Allen-Bradley...
  • Page 2 In no event will the Allen-Bradley Company be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

  • Page 3: Publication 1746-6.16 – January

    The areas in this manual which are different from previous editions are marked with change bars (as shown to the right of this paragraph) to indicate the addition of new or revised information. Allen-Bradley Publication 1746-6.16 – January 1999 SOC–1...
  • Page 4 Summary of Changes SOC–2 Publication 1746-6.16 – January 1999...
  • Page 5 If you do not, contact your local Allen-Bradley representative for training before using this product. Purpose and Contents This manual is a learning and reference guide for the 1746-INT4 of this Manual Thermocouple/mV Isolated Input Module.
  • Page 6 Preface Contents of this Manual Chapter Title Content Describes module hardware features, and Overview operation. Quick Start Serves as a Quick Start Guide for this module. Provides installation information and wiring Installation and Wiring guidelines. Describes the module ID code, I/O image words Preliminary Operating used by the module, input channel characteristics, Considerations...
  • Page 7 Preface Related Documentation The following documents contain information that may be helpful to you as you use Allen-Bradley SLC products. To obtain a copy of any of those listed, contact your local Allen-Bradley office or distributor. Document Read this Document...
  • Page 8 Technical Product Assistance If you need to contact Allen-Bradley for technical assistance, please review the information in the Module Diagnostics and Troubleshooting chapter first. Then call your local Allen-Bradley representative. P–4 Publication 1746-6.16 – January 1999...

  • Page 9: Table Of Contents

    ........4–5 Allen-Bradley Notes: ..........
  • Page 10 ........8–5 Contacting Allen-Bradley ......
  • Page 11 ......E–1 CSA Hazardous Location Appendix F Allen-Bradley Approval CSA Hazardous Location Approval ..... . .
  • Page 12 Table of Contents Publication 1746-6.16 – January 1999...
  • Page 13 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 the following Allen-Bradley publications: Industrial Automation Wiring and Grounding Guidelines (for noise immunity), publication 1770-4.1...

  • Page 14: General Description

    Chapter 1 Module Overview General Description The module stores digitally converted thermocouple and/or millivolt (mV) analog data in its image table for retrieval by all fixed and modular SLC 500 processors. The module supports connections from any combination of up to four thermocouple and/or mV analog sensors.

  • Page 15: Hardware Features

    Provides module information Removable Terminal Block Provides electrical connection to input devices. Door Label Permits easy terminal identification Cable Tie Slots Secure input wiring at the module Self-Locking Tabs Secure module in chassis slot Allen-Bradley 1–3 Publication 1746-6.16 – January 1999...

  • Page 16: Diagnostic Leds

    Chapter 1 Module Overview Diagnostic LEDs The module contains diagnostic LEDs that help you identify the source of problems that may occur during power-up or during normal operation. Power-up and channel diagnostics are explained in chapter 8, Module Diagnostics and Troubleshooting. System Overview The module communicates with the SLC 500 processor and receives +5Vdc and +24Vdc power from the system power supply through the parallel back-...

  • Page 17: Module Operation

    B, C, D, E, J, K, N, R, S, and T and extension wire. Refer to appendices A and C for details. The module is also compatible with a variety of mV devices with an output of 50 or 100 mV. Allen-Bradley 1–5 Publication 1746-6.16 – January 1999...

  • Page 18: Block Diagram Of Isolated Channel Input Circuits

    Chapter 1 Module Overview To minimize interference from radiated electrical noise, we recommend twisted-pair and highly shielded cables such as the following: For This Type of Device We Recommend This Cable (or equivalent) Thermocouple Type J EIL Corp. J20-5-502 Thermocouple Type K EIL Corp.

  • Page 19: Required Tools And Equipment

    (if needed) the module I/O chassis SLC processor and power supply programming equipment (Programming examples in this manual demonstrate the use of Allen-Bradley’s Advanced Programming Software for personal computers.) Allen-Bradley Publication 1746-6.16 – January 1999 2–1...

  • Page 20: Procedures

    – module (Catalog Number 1746-INT4) removable terminal block (factory–installed on module) with CJC sensors attached this user manual (publication number 1746-6.16) If the contents are incomplete, call your local Allen-Bradley representative for assistance. Review Power Requirements Reference Chapter 3 (Installation and Review the power requirements of the modules drawing power from the chassis power supply.
  • Page 21 Programming Software [APS] to configure your system can be found in The Getting Started Guide for APS [publication 9399-APSQS]. Example of Software Prompt: Press ENTER to select I/O Module Enter Module ID Code> 3515 offline SLC 5/03 File EXAMPLE SELECT MODULE Allen-Bradley Publication 1746-6.16 – January 1999 2–3...
  • Page 22 Chapter 2 Quick Start Set Up Channel 0 Reference Chapter 4 Determine the operating parameters for channel 0. This example shows the channel 0 configuration (Preliminary word defined with all defaults (0) except for the channel enable (bit 11=1). Module assumed in slot 1. Operating (For details on channel configuration, refer to the configuration worksheet on page 2-6) Considerations)
  • Page 23 Channel 2 Data Word Word 3 Channel 3 Data Word 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 Channel 0 Status Word Allen-Bradley Channel 1 Status Word Bit 15 Bit 0 Address I:1.4...
  • Page 24 Chapter 2 Quick Start Channel Configuration Worksheet Select your bit configurations. Write them at the bottom of the worksheet. Use one worksheet for each channel. Channel Configuration Word (O:e.0 through O:e.3) – Bit Descriptions É É É Set these bits in the Channel Configuration Word Bit(s) Define e ne...

  • Page 25: Electrostatic Damage

    SLC chassis to prevent overloading the chassis power supply. When using the module in a fixed controller, be sure not to exceed the power supply rating for the pair of modules in the 2-slot I/O chassis. Allen-Bradley Publication 1746-6.16 – January 1999 3–1...

  • Page 26: Considerations For A Fixed Controller

    Chapter 3 Installation and Wiring Considerations for a Modular System Fixed Controller Compatibility Table 5V dc 24V dc Place your module in any slot of an SLC500 modular, or modular expansion Module INT4 AMPS AMPS chassis, except for the left-most slot (slot 0) reserved for the SLC processor 0.035 –...

  • Page 27: Module Installation And Removal

    3. Cover unused slots with the Card Slot Filler, Catalog Number 1746-N2. 4. To remove, press the releases at the top and bottom of the module, and slide the module out of the chassis slot. Allen-Bradley Publication 1746-6.16 – January 1999 3–3...

  • Page 28: Wiring The Module

    Chapter 3 Installation and Wiring Figure 3.1 Installing the Module into the I/O Chassis Card Guides Top and Bottom Releases Wiring the Module The module contains a green, 18-position, removable terminal block. (Terminal Block Spare Part Catalog Number 1746-RT32) Release Screw CJC A+ Channel 0+ CJC Assembly...

  • Page 29: Cold Junction Compensation (Cjc)

    Position the module away from other modules that: connect to sources of electrical noise such as relays, and AC motor drives generate significant heat, such as 32-point I/O modules Allen-Bradley Publication 1746-6.16 – January 1999 3–5...

  • Page 30: Preparing And Wiring The Cables

    Chapter 3 Installation and Wiring Follow these guidelines to wire your input signal cables: To limit the pickup of electrical noise, keep thermocouple and millivolt signal wires as far from power and load lines as possible . For high immunity to electrical noise, use Alpha 5121 (shielded, twisted pair) or equivalent wire for millivolt sensors;...
  • Page 31 Cables Keep the length of unshielded wires as short as possible. Limit braid length to 12” or less. Solder braid to lug attached to bottom row of I/O chassis bolts. Allen-Bradley Publication 1746-6.16 – January 1999 3–7...

  • Page 32: Installing The Ferrite Collar

    Chapter 3 Installation and Wiring Installing the Ferrite Collar For immunity to electrical noise with this CE-marked module, insert a ferrite collar (Fair-Rite Inc. part number 0443164151) around the input cables immediately beneath the module in the I/O chassis. Do this as follows: 1.

  • Page 33: Module Id Code

    The (SPIO CONFIG) module ID automatically assigns the correct number of input and output words. If you are using a different programming software package, refer to the documentation that came with your software. Allen-Bradley Publication 1746-6.16 – January 1999 4–1...

  • Page 34: Module Addressing

    Chapter 4 Preliminary Operating Considerations Module Addressing The following memory map shows you how the SLC processor’s output and input image tables are defined for the module. Bit 15 Bit 0 Channel 0 Configuration Word Word 0 Channel 1 Configuration Word Word 1 Channel 2 Configuration Word Word 2...

  • Page 35: Input Image – Data Words And Status Words

    CJC reference value, and make the resulting values available to the SLC processor. It is typically 200 ms for multiplexing and 200 ms for Allen-Bradley sampling and converting. Publication 1746-6.16 – January 1999...
  • Page 36 Chapter 4 Preliminary Operating Considerations When sampling occurs after the signal reaches 99.9% of final value, the update time defines the minimum time (400 ms) for processing an input signal. Publication 1746-6.16 – January 1999 4–4...

  • Page 37: Effective Resolution Of A Channel And Input Device

    For thermocouples, we define resolution as the smallest increment of temperature that can be sampled after A/D conversion. It varies with temperature and with the type of thermocouple. We present a Allen-Bradley Publication 1746-6.16 – January 1999 4–5...
  • Page 38 Chapter 4 Preliminary Operating Considerations resolution graph for each type of thermocouple in Appendix A, Module Specifications. Millivolt devices are generally considered linear, and the effective resolution is that of the channel itself. Type of Device Resolution 0.05 C-0.75 C @ 300 thermocouple depending on the thermocouple millivolt sensor...

  • Page 39: Response To Slot Disabling

    SLC processor’s output image table are held in their last state and not transferred to the module. When the slot is re-enabled, output image table words are transferred to the module during the subsequent scan. Allen-Bradley Publication 1746-6.16 – January 1999 4–7...

  • Page 40: Notes:

    Chapter 4 Preliminary Operating Considerations Notes: Publication 1746-6.16 – January 1999 4–8...

  • Page 41: Create A New File

    And: Then: SLC 5/03 (or later) processor the screen displays Go to step 7 and press another pop-up window [ENTER] SLC 5/01 or 5/02 processor Go to the section Allen-Bradley Configure I/O (on next page) Publication 1746-6.16 – January 1999...
  • Page 42 Chapter 5 Accessing Files to Configure I/O 7. Identify the processor’s operating system. Read it on the label found on the side of the processor. Then, in the upper pop-up window, cursor to the correct operating system and press [ENTER]. Now you are ready to configure the I/O of your SLC system.

  • Page 43: Configure I/O

    The screen displays the rack description for rack 1 (top of screen), and removes the pop-up window. 5. If using more I/O racks, repeat steps 3 and 4 for rack 2 followed by rack 3. Allen-Bradley Publication 1746-6.16 – January 1999...
  • Page 44 Chapter 5 Accessing Files to Configure I/O Important: At this point, the software does the following automatically: allocates slot numbers consecutively for the configured set of I/O racks. For example, slots 1-7 if you configured racks 1 and 2 at 4 slots each. places an asterisk (*) next to each slot number configured in steps 3-5.

  • Page 45: Return To An Existing File

    5. To edit the logic, use function keys and follow the prompts as needed. 6. When finished programming, press EXIT [F3] 7. If you want to save your work, press SAVE [F2] Then, follow the prompts and use function keys as needed to save the file. Allen-Bradley Publication 1746-6.16 – January 1999...

  • Page 46: Notes:

    Chapter 5 Accessing Files to Configure I/O Notes: Publication 1746-6.16 – January 1999...

  • Page 47: Channel Configuration

    PID how the channel should respond to a detected open input circuit temperature units in C or Allen-Bradley whether the channel is enabled or disabled Publication 1746-6.16 – January 1999 6–1...
  • Page 48 Chapter 6 Channel Configuration, Data, and Status Channel Configuration Word (O:e.0 through O:e.3) – Bit Descriptions Set these bits in the Channel Configuration Word É É É Bit(s) Define e ne To elect To Select Description escr pt on 15-12 É...

  • Page 49: Selecting The Correct Data Format

    = –454 F and S = 1832 F. HIGH Allen-Bradley Solution: Proportional Counts Equivalent = { 65536 x [ ( 1000 F– (–454 F) ) / (1832 F– (–454 F ) ) ] } – 32768 = 8916 counts. Publication 1746-6.16 – January 1999...

  • Page 50: Channel Configuration Procedure

    Chapter 6 Channel Configuration, Data, and Status Channel Configuration Use this procedure once for each channel to set configuration bits that Procedure determine channel operation. Use the table of bit descriptions and the blank configuration worksheet in Appendix B. Copy it as needed to write down configuration selections of all your channels.
  • Page 51 0.1 C/step 0.1 F/step 0.0052 C/step 0.0093 F/step 0.0013 C/step 0.0023 F/step When millivolts are selected, the temperature setting is ignored. Analog input data is the same for either C or F selection. Allen-Bradley Publication 1746-6.16 – January 1999 6–5...

  • Page 52: Using Channel Status Words

    Chapter 6 Channel Configuration, Data, and Status Using Channel Status Words Channel status words are stored in the SLC controller’s input image file at addresses I:e.4-I:e.7 (where e is the slot number assigned to the module). Status words 4-7 correspond to and reflect the configuration of channels 0-3 (O:e.0-O:e.3).
  • Page 53 Range an e Detected under-range input. Condition not detected. Over Over Diagnostics s ics Range an e Detected over-range input. Condition not detected. Invalid Invalid Diagnostics s ics Config Detected invalid configuration. Allen-Bradley Publication 1746-6.16 – January 1999 6–7...

  • Page 54: Detected Faults Indicated By Bits 12-15

    Chapter 6 Channel Configuration, Data, and Status Detected Faults Indicated by Bits 12-15 When the module detects any of the conditions described for bits 12-15, it: sets the corresponding bit blinks the status LED on the front panel for the channel having the fault The module is designed to detect the following fault conditions: Open-circuit Detection (Bit 12) The module tests all enabled channels for an open-circuit condition each time...

  • Page 55: Processor Basics

    During the I/O scan, the SLC processor scans configuration words from its output image file to the module, and scans data and status words from the module to its input image file. The SLC processor scans its I/O following each program scan. Allen-Bradley 7–1 Publication 1746-6.16 – January 1999...

  • Page 56: Load Channel Configurations For Transfer To The Module

    Chapter 7 Ladder Programming Examples We repeat the configuration word because it is used often in the examples. Configuration Word É É É É É É É É É É Not Used Channel Not Used Temp Response to Data Type Enable Units Open Circuit...

  • Page 57: Change A Channel Configuration

    0000 1001 0001 0001 Important: While the module changes the channel configuration, it does not monitor inputs to any channel. For the delay in reading inputs, refer to Channel Update Time in chapter 4. Allen-Bradley 7–3 Publication 1746-6.16 – January 1999...

  • Page 58: Verify Changes To A Channel Configuration

    Chapter 7 Ladder Programming Examples Verify Changes to a When changing a channel configuration, there is always a delay until the Channel Configuration ladder logic reads the new data word based on the new configuration. Therefore, it is important to verify that a the module successfully stored the new channel configuration word.

  • Page 59: Process A Channel Input With The Pid Instruction

    For specific examples of the SCL instruction, refer to the APS User Manual or Analog I/O Modules User Manual. Rung 2:3 Data Table address data address data N10:0 0000 1000 0010 0001 (numerical equivalent = 2081) Allen-Bradley 7–5 Publication 1746-6.16 – January 1999...

  • Page 60: Monitor Channel Status Bits

    Chapter 7 Ladder Programming Examples Monitor Channel Status Bits This example shows how you could monitor the open-circuit error bit of each channel and set an alarm bit if the module detects an open input. An open- circuit error can occur if a thermocouple or CJC thermistor wire breaks or becomes disconnected from the terminal block.

  • Page 61: Module And Channel Diagnostics

    LEDs. It explains the types of conditions that might cause the module to flag an error, and suggests what corrective action you could take. Topics include: module and channel diagnostics LED indicators troubleshooting flowchart replacement parts contacting Allen-Bradley Module and Channel The module operates at two levels: Diagnostics module level channel level Module level operation includes functions such as power-up, configuration, and communication with the SLC processor.

  • Page 62: Led Indicators

    The module is OK. No action required. The module is turned off, Cycle power. If the condition persists, call your local or it detected a module fault. distributor or Allen-Bradley customer service for assistance. Module-status and Channel-status LEDs If Module And Channel Then:...

  • Page 63: Channel-Status Leds (Green)

    SLC processor disables all channels clears all data and status words Allen-Bradley A module failure is non-recoverable and requires the assistance of your local distributor or Allen-Bradley Support Services (see Preface). 8–3 Publication 1746-6.16 – January 1999...

  • Page 64: Troubleshooting Flowchart

    Chapter 8 Module Diagnostics and Troubleshooting Troubleshooting Flowchart Check LEDs on module. Channel Channel Channel Module Module Status LED Status LED Status LED(s) Status LED off Status LED on blinking off. Channel is Channel enabled Module fault Normal module not enabled. and working Fault operation...

  • Page 65: Replacement Parts

    1746-INT4 User Manual 1746-6.16 Contacting Allen-Bradley If you need to contact Allen-Bradley for assistance, please have the following information available when you call: a clear statement of the problem including a description of what the system is doing, LED status, and bit status of I/O image words (channel...

  • Page 66: Notes:

    Chapter 8 Module Diagnostics and Troubleshooting Notes: Publication 1746-6.16 – January 1999 8–6...

  • Page 67: Application Programming Examples

    Configure the thermocouple channel with the following setup: type J thermocouple (bits 3-0) F displayed in whole degrees with EU = x10 (bits 8, 5, 4) zero the data word in the event of an open circuit (bits 7, 6) Allen-Bradley Publication 1746-6.16 – January 1999 9–1...
  • Page 68 Chapter 9 Application Programming Examples Configuration Word É É É É É É É É É É É É É É É É Not Used Channel Not Used Temp Response to Data Type Enable Units Open Circuit Format of Input 0 = Disable 0 0 = zero 0 0 = EU x1...
  • Page 69 Display Panel Chilled H O Pipe Cabinet Type J Ambient Bath Steam Chilled H Chilled Thermocouple Cabinet Bath Type K Thermocouple Steam Thermocouple Type J Ambient Steam Pipe Selector Switches (I:2/1) and (I:2/0) Allen-Bradley Publication 1746-6.16 – January 1999 9–3...

  • Page 70: Thermocouple

    Chapter 9 Application Programming Examples Channel Configuration All channels are configured for: display temperature to tenths of a degree zero data word in the event of an open circuit Configuration setup for ambient thermocouple: channel 0 type T thermocouple Configuration setup for bath thermocouple: channel 1 type J thermocouple Configuration setup for steam thermocouple:...

  • Page 71: Program Setup

    3. Write ladder logic to monitor the channel 0 status word to determine whether ambient or cabinet temperature is being displayed, and energize the appropriate pilot light. 4. Write ladder logic to convert thermocouple data words to BCD and send them to the LED displays. Allen-Bradley Publication 1746-6.16 – January 1999 9–5...

  • Page 72: Program

    Chapter 9 Application Programming Examples Program The first six rungs change channel configurations based on the position of the two selector switches. Rung 2.0 If the degrees selector switch is switched to Fahrenheit, configure all four channels to read in degrees Fahrenheit. The default for channel 0 is to read the ambient temperature thermocouple.
  • Page 73 Compare N10:4 Rung 2.7 If channel 0 is configured to read the CJC sensor, energize the cabinet pilot light on the panel. Cabinet Light O:7.0 MASKED EQUAL Source I:1.4 Mask FEFF Compare N10:9 Allen-Bradley Publication 1746-6.16 – January 1999 9–7...
  • Page 74 Chapter 9 Application Programming Examples Rung 2.8 Convert data words to BCD format and send them to the LED displays. Write Ambient or Cabinet Temperature to the Display TO BCD Source I:1.0 Dest O:3.0 Rung 2.9 Write Bath Temperature to tthe Display TO BCD Source I:1.1...

  • Page 75: Electrical Specifications

    Maximum Wire Size Two 14 AWG wires per terminal Maximum Cable Impedance maximum loop impedance, for <1LSB error 150 ohms Removable, Allen-Bradley spare part Catalog Number Terminal Strip 1746-RT32 Refer to the thermocouple manufacturer for the correct extension wire. Allen-Bradley A–1...

  • Page 76: Environmental Specifications

    Appendix A Specifications Environmental Specifications Operating Temperature 0 C to 60 C (32 F to 140 F) −40 C to Storage Temperature 85 C (−40 F to 185 F) Relative Humidity 5% to 95% (without condensation) Agency Certification CSA certified (when product is marked) CSA Class I, Division 2, Groups A, B, C, D certified Hazardous Locations UL listed...

  • Page 77: Overall Accuracy

    0.280 C/ C, F/ F 50 mV 50 V 50 V 0.5 V/ C 50 ppm/ C 100 mV 50 V 50 V 0.5 V/ C 50 ppm/ C Assumes the module terminal block temperature is stable. Allen-Bradley Publication 1746-6.16 – January 1999 A–3...

  • Page 78: Thermocouple Resolution

    Appendix A Specifications Thermocouple Resolution Type C Thermocouple 0.32 C @ 2000 0.26 C @ 0 Resolution 0.20 C @ 1000 ( C) 1000 1250 1500 1750 2000 2250 Temperature ( C) Type D Thermocouple 0.34 C @ 0 0.27 C @ 2000 Resolution 0.20...

  • Page 79: Type J Thermocouple

    0.04 0.00 –300 –150 ( C) Temperature Type K Thermocouple C @ –250 Resolution ( C) 0.08 C @ 550 0.10 C @ 1350 –300 –150 1050 1200 1350 1500 ( C) Temperature Allen-Bradley Publication 1746-6.16 – January 1999 A–5...

  • Page 80: Type E Thermocouple

    Appendix A Specifications Type E Thermocouple 1.70 C @ –250 Resolution ( C) 0.05 C @ 1000 0.04 C @ 365 –300 –150 1050 1200 Temperature ( C) Type R Thermocouple 0.75 0.68 C @ 0 0.60 Resolution ( C) 0.45 0.26 C @ 885...
  • Page 81 –300 –150 900 1050 1200 1350 1500 1650 1800 ( C) Temperature Type T Thermocouple C @ –250 Resolution ( C) 0.08 C @ 65 0.05 C @ 400 –300 –150 Temperature ( C) Allen-Bradley Publication 1746-6.16 – January 1999 A–7...
  • Page 82 Appendix A Specifications Type B Thermocouple 1.20 1.13 C @ 300 0.90 Resolution ( C) 0.60 0.38 C @ 1060 0.31 C @ 1800 0.30 –300 –150 900 1050 1200 1350 1500 1650 1800 1950 Temperature ( C) Type N Thermocouple 0.170 0.10 0.150...

  • Page 83: Channel Configuration Worksheets

    12-15 Unused Unused 0000 These bits must be zero for a valid configuration. É É É É É É Allen-Bradley Enter Your Bit Selections >> 0000 For the Channel Configuration Word É É É Publication 1746-6.16 – January 1999 B–1...
  • Page 84 Appendix B Channel Configuration Worksheets Select your bit configurations. Write them down at the bottom of the worksheet. Use one worksheet for each channel. Channel Configuration Word (O:e.0 through O:e.3) – Bit Descriptions Set these bits in the Channel Configuration Word Bit(s) Define e ne...
  • Page 85 0000 These bits must be zero for a valid configuration. É É É É É É Enter Your Bit Selections >> 0000 For the Channel Configuration Word É É É Allen-Bradley É É É Publication 1746-6.16 – January 1999 B–3...
  • Page 86 Appendix B Channel Configuration Worksheets Select your bit configurations. Write them down at the bottom of the worksheet. Use one worksheet for each channel. Channel Configuration Word (O:e.0 through O:e.3) – Bit Descriptions Set these bits in the Channel Configuration Word Bit(s) Define e ne...

  • Page 87: Thermocouple Descriptions

    593C for AWG 14 (1.6mm), and 371C for AWG 24 or 28 (0.5 or 0.3mm).” Allen-Bradley It should be noted that the Constantan element of Type J thermoelements is NOT interchangeable with the Constantan element of Types T or N due to the different ration of copper and nickel in each.

  • Page 88: K Type Thermocouple

    Appendix C Thermocouple Descriptions K Type Thermocouple (NIckel–Chromium vs. Nickel–Aluminum) “This type is more resistant to oxidation at elevated temperatures than the Types E, J or T thermocouples and consequently it finds wide application at temperatures above 500C.” “Type K thermocouples may be used at “liquid hydrogen” temperatures. However, their Seebeck coefficient (about 4uV/K at 20K) is only about one–half of that of E thermocouples.

  • Page 89: T Type Thermocouple

    It should be noted that the Constantan element of Type J thermoelements is NOT interchangeable with the Constantan element of Types T or N due to the different ration of copper and nickel in each. Allen-Bradley Publication 1746-6.16 – January 1999...

  • Page 90: E Type Thermocouple

    Appendix C Thermocouple Descriptions E Type Thermocouple (Nickel–Chromium vs. Copper–Nickel <Constantan >) “Type E thermocouples are recommended by the ASTM Manual [1970] for use in the temperature range from –250 to 871C in oxidizing or inert atmospheres. The negative thermoelement is subject to deterioration above about 871C, but the thermocouple may be used up to 1000C for short periods.”...

  • Page 91: S And R Type Thermocouples

    1482C. Limits of error are not specified for Type S {or R} thermocouples below 0C. The recommended upper temperature limit for continuous use of protected thermocouples, 1482C, applies to AWG 24 (0.5mm) wire.” Allen-Bradley Publication 1746-6.16 – January 1999 C–5...

  • Page 92: C And D Type Thermocouples

    Appendix C Thermocouple Descriptions C and D Type Thermocouples (Tungsten-5% Rhenium vs. Tungsten-26% Rhenium) D (Tungsten-3% Rhenium vs. Tungsten-25% Rhenium) Types C and D thermocouples are recommended for use in the temperature range from 0 to 2320 C in non-oxidizing inert atmospheres. They are not practical for use below 750 F.

  • Page 93: About The Procedure

    Before starting the procedure, enter the following calibration rungs into processor memory: Copy Calibration Codes to the Module COPY FILE Source #N7:10 Dest #O:6.0 Length Copy Calibration Status into the Data Table COPY FILE Source #I:6.0 Dest #N7:0 Length Allen-Bradley Publication 1746-6.16 – January 1999 D–1...

  • Page 94: Calibration Codes And Status

    Appendix D Channel Calibration Calibration Codes and Status Use the following format for entering calibration code words and reading calibration status bits. You will enter calibration values in Hex. You can read channel status OK bits at different steps in the calibration procedure, one bit for each channel you are calibrating.

  • Page 95: Calibration Procedure

    (non-F Hex returned) 12.To end the calibration procedure, enter calibration code 0000 Hex into the data table address for configuration word 5 with your programming terminal. During thermocouple/mV operation, word 5 must be zero. Allen-Bradley Publication 1746-6.16 – January 1999 D–3...

  • Page 96: Notes:

    Appendix D Channel Calibration Notes: Publication 1746-6.16 – January 1999 D–4...
  • Page 97 When the channel is disabled the channel data word is cleared (0). digital filter – A low-pass filter of the A/D converter. The digital filter Allen-Bradley provides high-frequency noise rejection. Publication 1746-6.16 – January 1999...
  • Page 98 Appendix E Terms and Abbreviations effective resolution – The number of bits in the channel data word used to represent useful information. full scale error – (gain error) The difference in slope between the actual and ideal analog/thermocouple transfer functions. full scale range –...

  • Page 99: Csa Hazardous Location Approval

    To comply with CSA certification for use in hazardous locations, the following Pour satisfaire à la certification de la CSA dans des endroits dangereux, les information becomes a part of the product literature for CSA-certified Allen-Bradley informations suivantes font partie intégrante de la documentation des produits industrial control products.
  • Page 100 Appendix F CSA Hazardous Location Approval F–2 Publication 1746-6.16 – January 1999...
  • Page 101 4–3 cut–off frequency, 4–3, D–1 how to address status word, 4–3 how to use PID instruction, 7–5 using alarms to indicate status, 7–6 verifying channel configuration changes, Allen-Bradley 7–4 extension wire, 1–5 Publication 1746-6.16 – January 1999...
  • Page 102 Index I–2 FSR, D–2 noise filtering, 4–3 full scale error, D–2 normal mode rejection, D–2 full scale range, D–2 open–circuit, 6–8, 8–3 defining conditional state of channel data gain drift, D–2 downscale enable, 2–6, 6–2, B–1, B–2, gain error, D–2 B–3, B–4 See also full scale error upscale enable, 2–6, 6–2, B–1, B–2,...
  • Page 103 4–5 specifications, A–1 temperature units, representing data from electrical, A–1 type B thermocouple, 2–6, 6–2, B–1, environmental, A–2 B–2, B–3, B–4 input, A–2 terminal wiring, 3–4 physical, A–1 cold junction compensation, 3–5 Allen-Bradley Publication 1746-6.16 – January 1999...
  • Page 104 Index I–4 thermocouple types, 1–2, A–2 restrictions, C–1 Verification of dynamic configuration change, temperature ranges, 1–2, A–2 7–4 tools required for installation, 2–1 troubleshooting, 8–1 flowchart, 8–4 LED examination, 8–2 wiring, 3–1 terminal wiring, 3–4 cold junction compensation, 3–5 worksheets, B–1 update time, D–2 effects of filter time setting, 4–3 Publication 1746-6.16 –...
  • Page 105 Allen-Bradley...
  • Page 106 Philippines Poland Portugal Puerto Rico Qatar Romania Russia–CIS Saudi Arabia Singapore Slovakia Slovenia South Africa, Republic Spain Sweden Switzerland Taiwan Thailand Turkey United Arab Emirates United Kingdom United States Uruguay Venezuela Yugoslavia Allen-Bradley Headquarters, 1201 South Second Street, Milwaukee, WI 53204 USA, Tel: (1) 414 382-2000 Fax: (1) 414 382-4444 Publication 1746-6.16 – January 1999 PN955132–48...

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