Rockwell Automation 1756-CN2_CN2R, Series B ControlLogix ControlNet Interface Module - Manual (Page 30)

ControlNet Channel Troubleshooting (A OR B)
OR
A B
Cause Action
Off Channel has been disabled. Program network for redundant
media, if required.
Steady green This is normal operation. No action is required.
Flashing
green/off Temporary errors exist. None; unit will self-correct.
Node is not configured to go
online. Make sure the configuration
manager node (keeper) is present
and working, and the selected
address is not greater than the
maximum unscheduled node
address (UMAX).
(1)
The configuration manager node (keeper) is the node responsible for distributing ControlNet
configuration data to all nodes on the network.
(1)
Flashing red/off A media fault exists. Check media for broken cables,
loose connectors, or missing
terminators.
No other nodes are present on
the network. Add other nodes to the network.
30 ControlLogix ControlNet Interface Module
Publication 1756-IN607A-EN-P - February 2008