Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 77)

RUN/FLT
CAL/COM
11027-I
Chapter
7
Publication 1771ĆUM127B-EN-P - December 2002
Troubleshooting
We describe how to troubleshoot your module by observing
indicators and by monitoring status bits reported to the processor.
At power-up, the module turns the RUN/FLT indicator to red, then
checks for:
• correct RAM operation
• EPROM operation
• EEPROM operation
After passing initial diagnostics, the module turns the RUN/FLT
indicator to flashing green. The indicator will continue to flash green
until it receives a valid BTW. After the BTW, it will stay solid green
during operation. It will turn red if it detects a fault condition. If the
RUN/FLT indicator is red, block transfers will be inhibited.
The lower CAL/COM indicator flashes green when the module is
communicating with the processor. The speed of the flashing is
dependent upon system speed. If the module is accessed in less than
100ms intervals, the CAL/COM indicator will be solid red.
The module also reports status and specific faults (if they occur) in
every transfer of data to the processor. Monitor the green/red
indicators and status bits in the appropriate word of the BTR file
when troubleshooting your module.
Figure 7.1
Indicators
Indicator When Green When Red
RUN/FAULT
flashes - duringinitial powerĆup
solid - first valid block transfer write
successfully completed
solid - a fault is found
CAL/COM
flashes - when communication is taking
place between the PLC processor and
the NĆseries module.
flashes - during
calibration
Chapter Objective
Diagnostics Reported by
the Module