Allen-Bradley 1734-OB2, User Manual, Page: 155 / 221

Rockwell Automation Publication 1734-UM001E-EN-P - July 2013
Troubleshoot with the Indicators 157
Indication Probable Cause Recommended Action
System Power
Off Not active; field power is off or DC-DC converter problem present. 1. Verify power is on, and apply power if needed.
2. Verify backplane power not exceeded, and correct, as
needed.
3. Replace 1734-AENT module.
Green System power is on; DC-DC converter is active (5V). None.
Field Power
Off Not active; field power is off. Apply field power.
Green Power is on; 24V is present. None.
Indication Probable Cause Recommended Action
Network Activity
Off No link established. Verify network cabling, and correct, as needed.
Flashing green/Off Transmit or receive activity present. None.
Steady green Link established. None.
Network Status
Off Device not initialized. The module does not have an IP address. Apply power to device, verify IP address, and
correct, as needed.
Flashing green No CIP connections present. Device has an IP address, but no CIP connections are
established. None.
Solid green CIP connections present. Device online and has an IP address, and CIP
connections are established. None.
Flashing red One or more CIP connections has timed-out. Check for I/O module failure and controller
operation, and correct, as needed.
Solid red Duplicate IP address detected. Verify IP address setting and correct, as needed.
Flashing red/green The module is performing a self-test (only occurs during power cycle test). None.