QUICK START CLASSIC PLC-5 PROG Instruction Manual

4–2 Troubleshoot the Processor System
Publication 178510.3 - October 1996
Indicator Recommended ActionProbable CauseDescriptionColor
ADPT off processor is in scanner mode normal operation no action required
REM I/O
(in adapter
mode)
green
(steady)
active remote I/O link normal operation no action required
green
(blinking)
remote I/O active and host
processor is in program load
or TEST mode
normal operation no action required
red
(steady)
no communication with host
processor
duplicate station
address selected
Correct station address.
green
(sporadic)
bad communication with host
processor
Check connections.
off no communication with host
processor
no action required
REM I/O
(in scanner
mode)
green
(steady)
active remote I/O link normal operation no action required
red
(steady)
remote I/O link fault wiring, adapter
module(s)
• Check all connections, check adapter
module(s).
• If you have programming software,
put the processor in PROG mode and
do an autoconfigure for remote racks.
green/red
(blinking)
partial remote I/O link fault one or more
remote I/O chassis
faulted
• Check status bits in status file
(element #7) to identify faulted chassis
number; check wiring, adapter
module(s), power supplies.
• If you have programming software, put
the processor in PROG mode and do
an auto configure for remote racks.
off no remote I/O selected no action required
COMM green
(blinking rapidly
or slowly)
processor is transmitting or
receiving on DH+ link
normal operation no action required
red
(steady)
watchdog timeout hardware error Turn power off, then on. Check that the
software configurations match the
hardware setup. Replace the processor.
red
(sporadic)
bad communication on DH+
link
duplicate station
address selected
Correct station address.
off
• If directly connected to
processor, no
communication on DH+ link
• If last processor on DH+
link, no communication on
DH+ link
• no action required
• Check DH+ wiring connections.