Understanding the controlnet leds -2, Understanding the controlnet leds – Rockwell Automation 1203-CN1 ControlNet Communications Module 1203-CN1 User Manual
Page 76
Publication 1203-5.13 – February, 2002
7-2
Troubleshooting
Understanding the ControlNet
LEDs
When viewing the ControlNet LEDs, the color and status (solid or
flashing) of the LEDs are significant. In addition, the ControlNet
Channel A and Channel B LEDs may need to be viewed together or
independently, depending on their state. Refer to this table.
LEDs Viewed:
If:
Cause:
Action:
ControlNet
A and B
Together
Both LEDs are off.
A reset has occurred or there is no power.
Apply power to the module.
Both LEDs are steady
red.
A link interface failed.
1. Check media for broken cables, loose
connectors, missing terminators, etc.
2. Power cycle or reset the module.
If problem persists, contact Rockwell Automation
support.
LEDs are alternating red/
green.
The module is in self-test mode.
None. The module will exit this mode when the
self-test is completed.
LEDs are alternating red/
off.
There is a bad node configuration.
1. Verify that all node addresses are unique.
2. Check the module’s ControlNet configuration
parameter.
3. Check media for broken cables, loose
connectors, missing terminators, etc.
4. Power cycle or reset the module.
ControlNet
A or B
Independently
One channel LED is
steady off.
That channel is disabled or not supported.
Program the network for redundant media, if
required.
One channel LED is
flashing red/green.
There is an invalid link configuration for that
channel.
1. Power cycle or reset the module.
2. Reset the controller.
If problem persists, contact Rockwell Automation
support.
One channel LED is
flashing red/off.
There is a link fault or no frames received for
that channel.
1. Check media for broken cables, loose
connectors, missing terminators, etc.
2. Add other nodes to the network.
One channel LED is
flashing green/off.
A temporary channel error has occurred, or the
channel is in listen-only mode.
Verify the controller is present on the network
and working.
One channel LED is
steady green.
Normal operation for that channel.
None.