Rockwell Automation 1336-GM6 Enhanced DeviceNet Communications Module - Manual (Page 84)

8-2 Troubleshooting
DeviceNet Network Status LED
States The LED closest to the DeviceNet connector is the DeviceNet Status
LED, labeled “NET.” It functions as follows:
Module Status LED States The middle LED, labeled “MOD,” is the Module Status LED. It
indicates the operation of the Enhanced DeviceNet adapter and
functions as follows:
LED Viewed: If: State: Indicates Action:
Network
Status LED
LED is off Not powered/Not
online No power/Duplicate ID
not completed 1. Verify that the network supply is connected and that
power is reaching the adapter through the connector.
2. Make sure one or more nodes are communicating on
the network.
3. Make sure at least one other node on the network is
operational at the same time and data rate as the
adapter.
LED is 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.
LED is steady green Online/Connected One or more
connections
established No action needed.
LED is flashing red Online/Time-out I/O connection timed
out 1. Bring controller back onto the network.
2. Reduce traffic or errors on the network so that
messages can get through within the necessary time
frame.
LED is steady red Network failure Failed Duplicate ID or
Bus-off 1. Ensure that all nodes have unique addresses.
2. If all node addresses are unique, examine network for
correct media installation.
LED Viewed: If: State: Indicates: Action:
Module
Status LED
LED is off Not powered No power Ensure that the connected SCANport product is
powered and connected to the adapter.
LED is flashing
green Waiting for I/O data Normal operation —
No I/O, or PLC in
program No action needed. Adapter has passed all operational
tests and is waiting to pass I/O data between the
DeviceNet and SCANport interfaces.
LED is solid green Operational Normal operation —
I/O operational No action needed.
LED is flashing red Configuration
problem Bad CRC of Adapter
parameters or flash
program 1. Power cycle the adapter to reset it.
2. Enable an adapter reset via the adapter’s
configuration parameter.
3. Re-flash the adapter.
LED is steady red Hardware failure Failed internal or
external RAM test Replace unit.