Rockwell Automation 193-EDN E1Plus Overload Relays - DeviceNet Module - Manual (Page 44)

Publication 193-UM006A-EN-P – October 2005
5-4 Troubleshooting
DeviceNet Troubleshooting
Procedures The following table identifies possible causes and corrective actions when
troubleshooting DeviceNet-related failures using the NETWORK STATUS
LED.
Table 5.1 DeviceNet Troubleshooting Procedures
Color State Possible Cause Corrective Action
None 1. The E1 Plus DeviceNet Module is not receiving
power at the DeviceNet connector.
2. The module may be “autobauding”.
Check DeviceNet power and cable connections
and the power connection on the DeviceNet
connector.
Green
Red
Off Flashing (once) 1. The E1 Plus DeviceNet Module is trying to
determine the network baud rate.
2. Normal
The Network Status LED flashes green, red, and
off once during a normal power-up sequence.
Green Flashing E1 Plus DeviceNet Module is online but not
allocated to a master. Check DeviceNet master and its scan list for
correct scanner configuration.
Green Solid Normal operating state, and the E1 Plus DeviceNet
Module is allocated to a master. No action required.
Red Flashing I/O connection timed-out. Reset DeviceNet master device.
Red Solid 1. Diagnostics test failed on power-up/reset.
Internal fault exists.
2. Duplicate DeviceNet node address exists (two
DeviceNet nodes cannot have the same
address).
3. Invalid baud rate (if autobaud is disabled).
4. A fatal communication error occurred such as
“Bus Off”.
1. Cycle power to the unit and network. If the
fault still exists, replace unit.
2. Using the node commissioning tool, change the
node address to a valid setting and reset the
device.
3. This will only occur if Parameter 26,
AutoBaudEnable, is set to “disabled”. Set
Parameter 26 to “enabled” and reset the E1
Plus DeviceNet Module (or) set the Baud Rate
to the correct setting and reset the E1 Plus
DeviceNet Module.
4. Check DeviceNet media for proper installation:
• cable length according to baud rate
• termination resistors
• proper grounding