Rockwell Automation 1785-Lx0E,D178510.5 QUICK START ETHERNET PLC-9 - Manual (Page 20)

Publication 1785-10.5 - November 1998
4-2 Troubleshoot the Processor System
Troubleshoot the Processor Communication Channels
FORCE Amber
(steady) SFC and/or I/O forces
enabled Normal operation No action required
Amber
(blinking) SFC and/or I/O forces
present but not
enabled
Off SFC and/or I/O forces
not present
COMM Off No transmission on
channel 0 Normal operation if
channel is not being
used
Green
(blinking) Transmission on
channel 0 Normal operation if
channel is being used
Indicator Color Description Probable Cause Recommended Action
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
A
A B