Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 146)

Publication 1747-UM011G-EN-P - June 2008
146 Troubleshooting
• Power status indicator
on
• CPU Fault status
indicator is on
• All other status
indicators are off
• Status of SLC 5/02
Comm status indicator
does not matter
CPU fault CPU memory error. Cycle power.
Faulty memory
module.
1. Remove power and then remove the memory module from
the processor.
2. Re-install the processor and re-apply power to the power
supply. If steady CPU Fault status indicator changes to
flashing, replace the existing memory module with a
replacement module.
See chapter 6 for removing and installing memory modules.
Faulty processor or
power supply.
1. Place the processor in another chassis not in the existing
system and cycle power. If steady CPU Fault status indicator
reappears, replace the processor.
2. If CPU Fault status indicator clears, monitor the line power
going to the power supply in existing system. Replace
existing system power supply if line power checks OK.
Processor firmware
installed
incorrectly.
If upgrading the processor to a different firmware level, verify
that the firmware chip orientation matches the upgrade kit
directions.
• Power status indicator
is on
• CPU Fault status
indicator is flashing
• All other status
indicators are off
• Status of SLC 5/02
Comm status indicator
does not matter
CPU major fault Initial CPU factory
power-up
condition.
1. See chapter 8 and follow the start-up procedures.
2. Clear processor memory to get rid of the flashing CPU Fault
status indicator.
Hardware/software
major fault
detected.
(erratic, repetitive
power cycling can
cause a processor
major hardware
fault)
1. Monitor Status File word S:6 for major error code.
2. Refer to the SLC 500 Instruction Set Reference Manual,
publication 1747-RM001, for error codes and additional
troubleshooting information.
3. Remove hardware/software condition causing fault.
4. Clear Status File S:1/13 major error bits, if set.
5. Clear Status File S:5 major error bits, if set.
6. Clear Status File S:6 major error code (optional).
7. Attempt to put processor in run mode.
If unsuccessful, repeat recommended action steps above.
SLC 5/01 and SLC 5/02 Processor Errors
If the status indicators
indicate The following
error exists Probable Cause Recommended Action