Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 152)

Publication 1747-UM011G-EN-P - June 2008
152 Troubleshooting
• Power status indicator
is on
• Run status indicator is
on
• All other status
indicators are Off
• Status of any
Communication status
indicator does not
matter
System inoperable,
no major CPU
faults detected
User program logic
error.
1. Monitor logic in Run mode and verify desired I/O status.
2. Check for minor CPU faults.
Defective I/O
devices or I/O
wiring.
Test inputs and outputs according to I/O troubleshooting
procedures starting on page 163.
• Power status indicator
is on
• CPU Fault status
indicator is on
• All other status
indicators are off
• Status of any
Communication 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.
Refer to 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.
SLC 5/03, SLC 5/04, and SLC 5/05 Processor Errors
If the status indicators
indicate The following
error exists Probable Cause Recommended Action