User manual

Troubleshooting
General Problems 5-1
Enhanced, Ethernet,
and ControlNet PLC-5
processors only
Troubleshooting – Enhanced, Ethernet, and ControlNet
PLC-5 Processor General Problems
☞
Indicator Color Description Probable Cause Recommended Action
PROC green
(steady)
processor in RUN mode
and fully operational
normal operation none
green
(blinking)
processor memory being
transferred to EEPROM
normal operation none
red
(blinking)
major fault run-time error Check major fault bit in status file (S:11) for error
definition. Clear fault bit, correct problem, and return
to RUN mode.
red
(steady)
major fault • user RAM has
checksum error
• memory module error
•
internal diagnostics
have failed
• Clear memory and reload program
• Check backplane switch settings and/or insert
correct memory module
• Power down, reseat processor and power up.
Then, clear memory and reload your program.
Replace EEPROM with new program. Then, if
necessary, replace the processor.
BATT
PROC
FORCE
COMM
PROG
RUN
R
E
M