Rockwell Automation 20-COMM-M Modbus/TCP Adapter - Manual (Page 55)

Troubleshooting 5-3
20-COMM-M Modbus/TCP Adapter User Manual
Publication 20COMM-UM014C-EN-P
NET A Status Indicator This red/green bicolor LED indicates the status of the network connection
as shown in the table below.
NET B Status Indicator This green LED indicates the status of the adapter transmitting on the
network as shown in the table below.
Status Cause Corrective Actions
Off The adapter is not powered, the
adapter is not properly connected to
the network, or the adapter needs an
IP address.
•
Securely connect the adapter to the drive using the Internal
Interface (ribbon) cable and to the network using an Ethernet cable.
•
Correctly connect the Ethernet cable to the Ethernet connector.
•
Set a unique IP address using a BOOTP server or by disabling
BOOTP and using adapter parameters.
•
Apply power to the drive (or adapter if mounted in a DPI External
Comms Kit).
Steady Red The adapter failed the duplicate IP
address detection test. Configure the adapter to use a unique IP address and cycle power.
Flashing Red The Modbus/TCP connection has
timed out. Clear the fault on the drive and change Parameter 19 - [Msg I/O
Timer] to a higher value or to zero (0) to disable Modbus/TCP
connection timeouts.
Flashing Red/Green The adapter is performing a self-test. No action required.
Flashing Green
The adapter is properly connected
but is not communicating with any
devices on the network.
•
Verify that the controller can send messages to the adapter.
•
Create an I/O connection with the adapter by sending it Modbus/
TCP messages.
Steady Green The adapter is properly connected
and communicating on the network. No action required.
Status Cause Corrective Actions
Off The adapter is not powered or is not
transmitting on the network. If NET A indicator is off:
•
Securely connect the adapter to the drive using the Internal
Interface (ribbon) cable and to the network using an Ethernet cable.
•
Correctly connect the Ethernet cable to the Ethernet connector.
•
Set a unique IP address using a BOOTP server or by disabling
BOOTP and using adapter parameters.
If NET A indicator is steady red:
•
Configure the adapter to use a unique IP address and cycle power.
If NET A indicator is flashing red/green or red:
•
Check the IP address in the adapter and scanner, and verify that
the controller can communicate with the adapter.
•
Ping the adapter.
Normal condition if the adapter is idle.
Flashing Green The adapter is transmitting on the
network. No action required.