Allen-Bradley 1734-IM4 User Manual page 151

Indication Probable Cause
POINTBus Status
Off Device not powered - check module status indicator.
Alternating red/green LED power cycle test is present.
Flashing red Recoverable fault has occurred:
• At power up the number of expected modules does not equal the number of
modules present
• A module is missing
• Node fault (I/O connection timeout)
Flashing green Adapter online with no connections established.
• Adapter chassis size has not been configured
• Controller in program/idle mode
• ControlNet cable break
• Firmware (NVS) update
Solid green Adapter online with connections established (normal operation, in run mode) None.
Solid red Unrecoverable fault occurred - the adapter is bus off.
Indication Probable Cause
ControlNet A/B Status
Viewed Together (A and B)
Both Steady Off Reset, no power, or entire network interface deactivated.
Alternating red/green Self test mode is present.
Alternating red/Off Incorrect configuration is present.
Both Steady red Faulted unit is present.
Viewed Individually (A or B)
Steady Off Channel disabled.
Flashing red/green Incorrect network configuration is present.
Flashing red/Off • Media fault.
• No other nodes present on network.
Flashing green/Off • Temporary channel errors are present.
• Node is not configured to go on line.
Steady green Normal operation - MAC frames are being received without detected errors. None.
(1) The configuration manager node is the node responsible for distributing ControlNet configuration data to all nodes on the network.
Rockwell Automation Publication 1734-UM001E-EN-P - July 2013
Troubleshoot with the Indicators
Recommended Action
Apply power to device.
None.
• Change chassis size to match number of
modules present.
• Replace missing module.
• Check for I/O Module failure and correct, as
needed.
• Set adapter chassis size.
• None.
• Check cable and connect, as needed.
• Complete firmware update.
1. Cycle power to device.
2. If condition persists, replace device.
Recommended Action
None or cycle power.
None.
Check network address and other ControlNet
configuration parameters.
Cycle power or reset unit. If fault persists, contact
A-B representative or distributor.
Program network for redundant media, if required.
Cycle power or reset unit. If fault persists, contact
A-B representative or distributor.
• Check media for items such as broken cables,
loose connectors, and missing terminators.
• Add other nodes to the network.
Make sure the configuration manager node is
present and working and selected address is not
(1)
greater than selected UMAX.
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