Western Reserve Controls
WRC-CANR-DF-DN and –SM User’s Manual
PUB 14.2
Revision 4.03
19
7. Troubleshooting
This section identifies some of the common problem observed when commissioning or operating
a CANR-DF Extender.
Problem:
DeviceNet devices will not communicate on the network
Module Status LED is solid Green
Network Status LEDs are flashing Green at ½ second intervals
Meaning
No transmissions have been received by the CANX for 0.5 seconds.
Possible Solutions:
1. Network cables are broken or disconnected.
2. Network is not properly terminated.
3. All devices have stopped trying to communicate on the network.
4. Power has been lost on the B Side subnetwork.
Problem:
DeviceNet devices will not communicate on the network
Module Status LED is solid Green
Network Status LEDs are flashing Green quickly
Meaning
The CANR is in autobaud and is waiting for a valid message to fix its baud rate.
Possible Solutions:
1. Network cables are broken or disconnected.
2. Network is not properly terminated.
3. All devices have stopped trying to communicate on the network.
Problem:
Some messages are missed on network.
Module Status LED is solid Green
NSA and NSB LEDs are flashing Red
Meaning
Internal CAN buffers are full. Network has more traffic than it can handle.
Possible Solutions:
1. Reduce the scan rate from the Master.
2. Reduce the COS frequency on I/O devices.
3. Decrease the assembly sizes of I/O connections.
4. Recalculate the network traffic and bandwidth without the CANX.
Problem:
Some messages are missed on network.
Module Status LED is flashing Red
Meaning
Internal AMT buffers are full. Network has more traffic than it can handle.
Possible Solutions:
1. Reduce the scan rate from the Master.
2. Reduce the COS frequency on I/O devices.
3. Decrease the assembly sizes of I/O connections.
4. Recalculate the network traffic and bandwidth without the CANX.
