Allen-Bradley 1734-OB2, User Manual, Page: 151 / 221

Rockwell Automation Publication 1734-UM001E-EN-P - July 2013
Troubleshoot with the Indicators 153
Indication Probable Cause Recommended Action
POINTBus Status
Off Device not powered - check module status indicator. Apply power to device.
Alternating red/green LED power cycle test is present. None.
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)
• Change chassis size to match number of
modules present.
• Replace missing module.
• Check for I/O Module failure and correct, as
needed.
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
• Set adapter chassis size.
• None.
• Check cable and connect, as needed.
• Complete firmware update.
Solid green Adapter online with connections established (normal operation, in run mode) None.
Solid red Unrecoverable fault occurred - the adapter is bus off. 1. Cycle power to device.
2. If condition persists, replace device.
Indication Probable Cause Recommended Action
ControlNet A/B Status
Viewed Together (A and B)
Both Steady Off Reset, no power, or entire network interface deactivated. None or cycle power.
Alternating red/green Self test mode is present. None.
Alternating red/Off Incorrect configuration is present. Check network address and other ControlNet
configuration parameters.
Both Steady red Faulted unit is present. Cycle power or reset unit. If fault persists, contact
A-B representative or distributor.
Viewed Individually (A or B)
Steady Off Channel disabled. Program network for redundant media, if required.
Flashing red/green Incorrect network configuration is present. Cycle power or reset unit. If fault persists, contact
A-B representative or distributor.
Flashing red/Off • Media fault.
• No other nodes present on network.
• Check media for items such as broken cables,
loose connectors, and missing terminators.
• Add other nodes to the network.
Flashing green/Off • Temporary channel errors are present.
• Node is not configured to go on line.
Make sure the configuration manager node is
present and working and selected address is not
greater than selected UMAX.
(1)
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.