Allen-Bradley devicenet modules in logix5000 control systems 用户手册

Publication DNET-UM004A-EN-P - March 2004

12-2        Troubleshoot a DeviceNet Network

Module status indicator:

Network status indicator:

off

No power applied to module.

Apply power.

flashing 
green

No MicroLogix or CompactLogix controller is present.

1. Make sure module connectors are properly seated.
2. Cycle power to the controller.
3. Replace the controller.
4. Replace the device.

solid green

Device is OK.

None.

flashing 
red

Recoverable Fault - Memory has been erased or is being 
programmed.

Complete flash update or start a new update.

solid red

Unrecoverable fault

1. Make sure the device connectors are properly 

seated.

2. Make sure the bus terminator/end cap is installed.
3.  Cycle power.
4. Replace the device.

off

Any of the following:

• No device power.
• No network power.
• Communications are not occurring between the 

device and the DeviceNet network. 

1. Make sure the device has power. 
2. Make sure the DeviceNet cable is securely 

connected and the DeviceNet network has power.

3.  Make sure the network power is adequate (11 to 

25V dc).

flashing 
green

Device is OK but is not communicating with other devices on 
the network.

If the device is supposed to communicate with other devices, 
add those devices to the scan list of this device.

solid green

Device is OK, has a scan list and is not in Idle mode.

None.

flashing 
red

Communication with at least 1 device has timed out.

Check the 2-character display to determine which device has 
timed out.

solid red

Any of the following:

• Another device is using the same address.
• Communication problems on the network (bus off 

condition).

• Make sure the device has a unique address.
• Make sure all devices are at the same baud rate.
• Cycle power to the device.
• For more corrective actions, see status code 91 on