User manual

Troubleshooting
General Problems 5-12
Classic PLC-5
processors only
Troubleshooting – Classic PLC-5 Processor General Problems troubleshooting – Classic PLC-5 processors general problems continued...
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
• Clear memory and reload program
• Check backplane switch settings
and/or insert correct memory
module
off processor in program
load or TEST mode or
is not receiving power
Check power supply and connections
COMM
BATT
FAULT
REM I/O PROC
ACTIVE
RUN
ADPT FORCE
REM
R
U
N
P
R
O
G