QUICK START CONTROLNET PLC-5
4–5Troubleshoot the Processor System
Publication
1785-10.7 – October 1997
Indicator Color Channel Mode Description Probable Cause Recommended Action
A or B
Green
(steady)
Remote I/O
Scanner
Active Remote I/O link, all
adapter modules are
present and not faulted
Normal operation No action required
Remote I/O
Adapter
Communicating with
scanner
DH+ Processor is transmitting or
receiving on DH+ link
Green
(blinking
rapidly or
slowly)
Remote I/O
Scanner
At least one adapter is
faulted or has failed
• Power off at
remote rack
• Cable broken
• Restore power to
the rack
• Repair cable
DH+ No other nodes on network
Red
(steady)
Remote I/O
Scanner
Remote I/O
Adapter
DH+
Hardware fault Hardware error
• Turn power off, then
on.
• Check that the
software
configurations match
the hardware set-up.
• Replace the
processor.
Red
(blinking
rapidly or
slowly)
Remote I/O
Scanner
Faulted adapters detected
• Cable not
connected or
is broken
• Power off at
remote racks
• Repair cable
• Restore power to
racks
DH+ Bad communication on DH+ Duplicate
node detected
Correct station address
Off Remote I/O
Scanner
Remote I/O
Adapter
DH+
Channel offline Channel is not
being used
Place channel online if
needed
Using the DH+/RIO
Status Indicators