Allen-Bradley 1794-IRT8 - Chapter 6: Calibrating Your Module; Calibration Overview and Methods

Publication 1794-6.5.12 - November 1997
Chapter 6
Calibrating Your Module
What This Chapter
Contains
Use this chapter to calibrate the thermocouple/RTD/mV input module.
We tell you about:
When and How to
Calibrate Your
RTD/Thermocouple/mV
Module
Your module is shipped to you already calibrated. If a calibration
check is required, the module must be in a FLEX I/O system.
Perform module calibration periodically, based on your application.
Module calibration may also be required to remove module error due to
aging of components in your system.
Offset calibration must be done first, followed by gain calibration.
Calibration can be accomplished using any of the following methods:
• manual calibration, as described below.
• 6200 I/O CONFIGURATION software – refer to your 6200 software
publications for procedures for calibrating.
• DeviceNetManager Software – refer to your DeviceNet Manager
software documentation for the DeviceNet Adapter Module, Cat. No.
1794-ADN.
Important: You must use a 1794-TB3G or -TB3GS terminal base when
calibrating this module.
For information on See page
When and How to Calibrate Your TC/RTD Module . . . . . . . . . . . . . . . 6-1
Tools and Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Manually Calibrating your Thermocouple/RTD/mV Input Module . . . . 6-2
Calibration Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Wiring Connections for the TC/RTD Module. . . . . . . . . . . . . . . . 6-3
Read/Write Words for Calibration . . . . . . . . . . . . . . . . . . . . . . . 6-4
EDT Calibration Commands and Command Data. . . . . . . . . . . . . . . . 6-5
Offset Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Gain Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Current Source Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Cold Junction Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8