Rockwell Automation 1785-l11B, -L20B, -L30B, -L40B, -L40L, -L60B, -L60L, -L80B Enhanced PLC-5 Programmable Controllers Installation Instructions - Manual (Page 19)

Publication 1785-IN062A-EN-P - May 2005
Enhanced PLC-5 Programmable Controllers 19
Troubleshoot the Controller Communication Channels
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+ Controller 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 controller.
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