Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 75)

Troubleshooting 8-3
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
NET A Status Indicator This red/green bicolor LED indicates the receive status of the adapter as
shown in the table below.
NET B Status Indicator This green LED indicates the transmit status of the adapter as shown in the
table below.
Flashing Green The adapter is operational, but is not transferring I/O
data.
•
Place the scanner in RUN mode.
•
Program the controller to recognize and transmit I/O to the adapter.
•
Configure the adapter for the program in the controller.
•
Normal behavior if all I/O has been disabled in Parameter 16 - [DPI
I/O Cfg].
Flashing Red/
Green The adapter has detected a framing error. Check Parameter 09 -[Stop Bits Act] and Parameter 30 - [Stop Bits
Cfg].
Steady Green The adapter is operational and transferring I/O data. No action required.
Status Cause Corrective Action
Status Cause Corrective Actions
Off The adapter is not powered or is not properly connected
to the network.
The first incoming network command is not yet
recognized.
•
Securely connect the adapter to the drive using the
Internal Interface (ribbon) cable.
•
Correctly connect the RS-485 cable to the connector.
•
Apply power to the drive.
•
Set the baud rate and/or parity to match the controller.
•
Set the correct network protocol.
Flashing Red A network connection has timed out.
•
Set the timeout in Parameter 11 - [Network Timeout].
•
Place the scanner in RUN mode.
•
Verify that there is not too much traffic on the network.
Steady Red The device has detected an error that has made it
incapable of communication on the network.
•
Select the correct network protocol.
•
Select correct data rate.
•
Verify node address is correct.
•
Cycle power to apply changes.
Flashing Green Online to network, but not producing or consuming I/O.
If Parameter 11 - [Network Timeout] has not been set
to “0” (zero), this indicates that the adapter has not
received any messages within the interval, but it has not
yet timed out. The LED will turn steady green when
communication resumes.
•
Place the scanner in RUN mode.
•
Program the scanner to send messages to this specific
adapter within the specified timeout.
•
Configure the adapter for the program in the controller.
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.
•
Program a controller to recognize and transmit I/O to
the adapter.
•
Place the controller in RUN mode or apply power.
•
Configure the adapter for the program in the controller.
Steady Green The adapter is transmitting data on the network. No action required.