Rockwell Automation AADvance Controller Troubleshooting and Maintenance Manual - Manual (Page 26)

 

3-4 Document: 553634
(ICSTT-RM406F_EN_P) Issue: 089:
Troubleshooting and Maintenance Manual (AADvance
Controller)
Faults occurring in the I/O subsystem are latched. In order to clear them, you must remedy the source
of the fault (usually by replacing a module) and then press the Fault Reset button on the processor
module. During the reset operation, the application software continues to run at its normal scan rate.
There is no change in system performance and no additional vulnerability to faults.
Indications of field faults (which appear as an amber Channel status indicator) are non-latching. You
may not see some short term problems. The fault indication clears as soon you remedy the source of
the problem.
Common Fault Alarm
A variable in the Workbench application program can be set up to provide a common fault alarm. The
alarm is functionally equivalent to the System Healthy indicator on a processor module, and is
usually the starting point for investigations into system faults.
Fault Indications
To review status LEDs and rectify faults, do the following:
1) Review the status LEDs on each module.
Note: Some output faults are only visible when outputs are energised, so check
for these while testing field devices.
2) If the status LEDs reveal faults, use the procedures in this document to diagnose
and rectify the problems.
Note: There are no user-serviceable parts inside AADvance modules. A defective
module must be returned to Rockwell Automation.
Fault Indications
The diagnostic systems detect four classes of fault: