Allen-Bradley 1794-IRT8 - Page 33

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Publication 1794-6.5.12 - November 1997

3-6 Programming Your Thermocouple/RTD Input Module

Allen-Bradley PLCs

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Table of Contents8
What this Chapter Contains10
- Typical Communication between an Adapter and a Module11
What the Thermocouple/Rtd/MV Input Module Does10
How Tc/Rtd/MV Modules Communicate with10
- Programmable Controllers10
Features of Your Module12
Chapter Summary12
What this Chapter Contains14
Before You Install Your Input Module14
European Union Directive Compliance14
- EMC Directive14
- Low Voltage Directive15
Power Requirements15
- Wiring the Terminal Base Units (1794-TB3G Shown)16
Installing the Module17
- Mounting the Terminal Base Unit on a DIN Rail17
- Panel/Wall Mounting19
- Mounting the Thermocouple/Rtd/MV Module on the Terminal Base Unit21
Connecting Wiring for the Tc/Rtd/MV Module22
- Connecting Wiring Using a 1794-TB3G and -TB3GS22
  - Input Module24
- Example of 2-, 3- and 4-Wire RTD and Thermocouple Wiring to a 1794-TB3G Terminal Base Unit25
Module Indicators26
Chapter Summary26
What this Chapter Contains28
Enter Block Transfer Instructions28
- PLC-2 Family Processor29
- PLC-5 Family Processor30
- PLC-5/250 Processor31
Chapter Summary32
What this Chapter Contains34
Configuring Your Thermocouple/Rtd/MV Input Module34
Sensor Types35
Reading Data from Your Module36
Mapping Data for the Thermocouple/Rtd/MV Module36
- Thermocouple/Rtd/MV Input Module (1794-IRT8) Read Words36
- Bit/Word Descriptions for the Thermocouple/Rtd Input Module (1794-IRT8) Block Transfer Read Words37
- Thermocouple/Rtd/MV Input Module (1794-IRT8) Write Words38
  - Output Mapping38
- Bit/Word Definitions for the Block Transfer Write Words for the Tc/Rtd/MV Input Module38
Chapter Summary42
Chapter Objectives44
About Devicenetmanager Software44
Polled I/O Structure44
- Adapter Input Status Word45
System Throughput46
Mapping Data into the Image Table46
- Image Table Mapping46
- Thermocouple/Rtd Input Module (1794-IRT8) Read Words47
- Thermocouple/Rtd Input Module (1794-IRT8) Write Words47
  - Input Module (1794-IRT8)48
Defaults54
Chapter Summary54
What this Chapter Contains56
When and How to Calibrate Your Rtd/Thermocouple/MV Module56
Tools and Equipment57
Manually Calibrating Your Rtd/Thermocouple/MV Input Module57
- Calibration Setups58
- Wiring Connections for Calibrating the Tc/Rtd/MV Input Module58
- Read/Write Words for Calibration59
- EDT Calibration Command and Command Data60
- EDT Calibration Commands and Command Data60
- Offset Calibration61
- Gain Calibration62
- Current Source Calibration63
- Cold Junction Calibration63

Allen-Bradley 1794-IRT8 - Page 33

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