Rockwell Automation 1785 PLC-5 Manuel d'utilisateur Page 123

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Troubleshooting
Communication Channel 5-3
Enhanced, Ethernet,
and ControlNet PLC-5
processors only
Troubleshooting – Enhanced, Ethernet, and ControlNet
PLC-5 Processor Communication Channel
Indicator Color Channel Mode Description Probable Cause Recommended Action
A or B green
(steady)
RIO scanner active RIO link, all adapter
modules are present and
not faulted
normal operation none
RIO adapter communicating with
scanner
normal operation none
DH+ processor is transmitting or
receiving on DH+ link
normal operation none
green
(blinking
rapidly or
slowly)
RIO scanner at least one adapter is
faulted or failed
power off at remote rack
cable broken
Restore power to the rack
repair cable
DH+ no other nodes on network
A
A
B
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