Rockwell Automation 1203-GK5 DeviceNet Communications Module FRN 1.xxx-3.xxx - Manual (Page 82)

7-2 Troubleshooting
DeviceNet Network Status LED The LED closest to the DeviceNet connector is the DeviceNet Status
LED. It is labeled “NET.” Refer to the following table:
LED status State: Indicates Action:
off Not powered/Not
online No power/Duplicate ID
not completed 1. Verify that the network power supply is connected and
that power is reaching the adapter through the
connector.
2. Verify that one or more nodes are communicating on
the network.
3. Verify that at least one other node on the network is
operational at the same time and data rate as the
adapter.
flashing green Online/Not connected Passed duplicate
ID/No connection
established No action needed. The LED is flashing to signify that
there are no open communication connections between
the adapter and any other device. Any connection (I/O or
explicit message) made to the adapter over DeviceNet
will cause the LED to stop flashing and remain steady on
for the duration of any open connection.
steady green Online/Connected One or more
connections
established No action needed.
flashing red Online/Time-out I/O connection timed
out 1. Connect the controller to the network.
2. Reduce traffic or errors on the network so that
messages can get through within the necessary time
frame.
steady red Network failure Failed Duplicate ID or
Bus-off 1. Verify that all nodes have unique addresses.
2. If all node addresses are unique, examine network for
correct media installation.