Installation manual

Publication 1747-RM001G-EN-P - November 2008
16-2 Troubleshooting Faults
Manually Clear Faults
The following section describes the different ways to manually clear a fault
when using an SLC processor.
• Manually clear the major fault bit S:1/13, and the minor and major error
bits S:5/0-7 in the status file, using a programming device or a Data
Table Access Module. Place the processor in the REM Program mode.
Correct the condition causing the fault, then return the processor to
either REM Run or any of the REM Test modes.
• SLC 5/03 and higher processors: Toggle the keyswitch from RUN to
PROGram and then back to RUN.
Use the Fault Routine
When designating a subroutine file, the occurrence of recoverable or
non-recoverable user faults causes the designated subroutine to be executed
for one scan. If the fault is recoverable, the subroutine can be used to correct
the problem and clear the fault bit S:1/13. The processor then continues in the
RUN mode. If the fault is non-recoverable, the subroutine can send a message
via a Message instruction to another node with error code information and/or
can do an orderly shutdown of the process.
The subroutine does not execute for non-user faults.
ATTENTION
SLC 5/03 and higher processors: Clearing these bits with
the keyswitch in the RUN position causes the processor to
immediately enter the Run mode.
ATTENTION
If you are online with an SLC 5/03 (or higher) processor
with the keyswitch position in RUN and you press the clear
major fault function key, you are warned that the processor
will enter the Run mode once you clear the fault.