User manual

Publication CNET-UM001C-EN-P - November 2005
8-10 Troubleshoot Your ControlNet Communication Modules
This table describes the 1756-CNB and 1756-CNBR network channel status
indicators.
Table 8.4 .1756-CNB and 1756-CNBR Network Channel Status Indicators
If Both Channel
Status Indicators Are
It Means Take This Action
Off No power Apply power.
Steady red Faulted module 1. Cycle power to the module.
2. If fault persists, contact your Rockwell Automation
representative or distributor.
Alternating red/green Self-test None
Alternating red/off One of the following:
• incorrect node configuration
• duplicate ControlNet node address
Check the node address and other ControlNet configuration
parameters.
If either channel
status indicators are:
It means: Take this action:
Off Channel disabled Program network for redundant media, if necessary.
Steady green Normal operation None
Flashing green/off Temporary network errors 1. Check media for broken cables, loose connectors,
missing terminators.
2. If condition persists, refer to the ControlNet Coax
Media Planning and Installation Manual, publication
and CNET-IN002
Node is not configured to go online Make sure the network keeper is present and working and
the selected address is less or equal to the UMAX
(1)
.
Flashing red/off Media fault 1. Check media for broken cables, loose connectors,
missing terminators.
2. If condition persists, refer to the ControlNet Coax
Media Planning and Installation Manual, publication
and CNET-IN002
No other nodes present on network Add other nodes to the network.
Flashing red/green Incorrect node address 1. Change the node address so that it is less than or
equal to UMAX.
2. Stop and restart the PCIC/PCICS driver in RSLinx
software.
Incorrect network configuration Reconfigure the ControlNet network so that UMAX is greater
than or equal to the node address.
(1)
UMAX is the highest node address on a ControlNet network that can transmit data.