Rockwell Automation 1746-INT4 Thermocouple/MV Isolated/ User Manual - Manual (Page 103)

103 Publication 1746-UM614B-EN-P - September 2007
Appendix
D
Channel Calibration
This appendix shows you how to calibrate the module’s input
channels.
About the Procedure The purpose of the procedure is to store a pair of calibration values in
EEPROM for each channel to set channel accuracy at 0.05% of full
range regardless of channel circuit tolerances. The module is designed
so you can calibrate its input channels individually or in groups. The
thermocouple/mV operation of all channels is suspended during
calibration.
With your programming terminal, you enter calibration codes in word
5 of the configuration file and read status in words 4 and 5 of the
status file. A rung of ladder logic copies calibration codes into the
output image table for transfer to the module, and another rung
copies calibration status from the module (input image table) into the
data table. You perform calibration with the SLC processor in Run
mode.
For more information on addressing calibration words, refer to
Chapter 4.
Calibration Logic
Before starting the procedure, enter the following calibration rungs
into processor memory.
COP
COPY FILE
Source
#N7:10
Dest #O:6.0
Length 8
able
COP
COPY FILE
Source
#I:6.0
Dest #N7:0
Length 8
Copy Calibration Codes to the Module.
Copy Calibration Status into the Data Table