Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 149)

Publication 1747-UM011G-EN-P - June 2008
Troubleshooting 149
Troubleshooting the
SLC 5/03, SLC 5/04, and
SLC 5/05 Processors Between the time you apply power to an SLC 5/03, SLC 5/04, or
SLC 5/05 processor and the communication are established via a
connected programming device, the only form of communication
between you and the processor is through the status indicator display.
When power is applied, all of the status indicators flash on and then
off while the processor conducts hardware tests. This is part of the
normal powerup sequence. Following the selftest by the processor, all
the status indicators again flash on momentarily. If a user program is
in a running state, the RUN status indicator will be on. If a fault exists
within the processor, the FLT status indicator is on.
Follow these steps to receive the maximum benefit of this
troubleshooting section.
1. Identify the status of your processor status indicators. See
chapter 5 for description of status indicators and their different states.
2. Using the tables on the following pages, match your processor
and power supply status indicators with the status indicators in
the first column.
3. Once the status indicators are matched to the appropriate table,
move across the table identifying error description and probable
causes.
4. Then follow the recommended action steps for each probable
cause until the cause is identified.
5. If recommended actions do not identify the trouble cause,
contact your local Rockwell Automation sales office or
distributor.
Clearing SLC 5/03, SLC 5/04, and SLC 5/05 Processor Faults Using
the Keyswitch
Toggle the keyswitch from RUN to PROG and then back to RUN; this
will clear some faults. If the keyswitch is left in the RUN position, the
processor mode cannot be changed from a programmer/operator
interface device. If you return the keyswitch to the REM position, you