Rockwell Automation 1771-IXE/D Thermocouple/Millivolt Input Module User Manual - Manual (Page 51)

Chapter
7
Publication 1771Ć6.5.130 Ć May 1999
Troubleshooting
We describe how to troubleshoot your module by observing LED
indicators and by monitoring status bits reported to the processor.
At power–up, the module momentarily turns on both indicators as a
lamp test, then checks for
•
correct RAM operation
•
EPROM operation
•
EEPROM operation
•
a valid write block transfer with configuration data
Thereafter, the module lights the green RUN indicator when
operating without fault, or lights the red FAULT indicator when it
detects fault conditions. If the red FAULT indicator is on, block
transfers will be inhibited.
The module also reports status and specific faults (if they occur) in
every transfer of data to the PC processor. Monitor the green and
red status indicators and status bits in word 1 of the BTR file when
troubleshooting your module.
Figure 7.1
Status Indicators
RUN
FLT
TC/MV
MODULE
Green RUN LED
Red FLT LED
10534-I
Chapter Objective
Diagnostics Reported by
the Module