Rockwell Automation 1794-IT8,D17946.5.7 Thermocouple/Millivolt Input Module - Manual (Page 43)

Chapter
6
Publication 1794-6.5.7 – April 1997
Calibrating Your Module
In this chapter we tell you:
•
what tools are needed to calibrate
•
how to calibrate out lead wire resistance
•
calibrate your module manually
•
calibrate your module using DeviceNetManager software
Your module is shipped to you already calibrated. If a calibration
check is required,follow the procedure below.
Perform module calibration periodically, based on your application.
Module calibration may also be required to remove module error due
to aging of components
In addition, calibration may be required to eliminate long lead wire
resistance to open circuit detection current. See “Error Due to Open
Circuit Current Through Loop Resistance” in Appendix A.
Calibration can be accomplished using any of the following methods:
•
manual calibration, as described below.
•
6200 I/O CONFIGURATION software (version 5.2 or later)–
refer to your 6200 software publications for procedures for
calibrating.
•
DeviceNetManager Software – refer to your DeviceNetManager
software documentation for the DeviceNet Adapter Module, Cat.
No. 1794-ADN. Some portion of this calibration is included here
for use by personnel proficient with DeviceNet Adapter
configuration software.
Important: You can use a 1794-TB2 or -TB3 terminal base unit if
you are using the thermocouple/mV module in the
millivolt mode only. You must use a 1794-TB3T
terminal base unit for all thermocouple uses.
Chapter Objective
General Information