Allen-Bradley 1734-OB2, User Manual, Page: 152 / 221

Rockwell Automation Publication 1734-UM001E-EN-P - July 2013
154 Troubleshoot with the Indicators
1734-APB PROFIBUS Adapter
Indication Probable Cause Recommended Action
System Power
Off Not active - field power is off or DC-DC converter problem. 1. Verify field power is on.
2. Verify backplane power (load current) is not exceeded.
3. Replace 1734-ACNR adapter.
Green System power is on, and DC-DC converter is active (5V). None.
Field Power
Off Not active - field power is off. Apply power to device.
Green Power is on - 24V is present. None.
Adapter
Status
PROFIBUS
Status
PointBus
Status
1734-APB
Field
Power
System
Power
System Power
Field Power
Adapter Status
PROFIBUS Status
POINTBus Status
1734-2
Indication Probable Cause Recommended Action
Adapter Status
Off • No power supplied.
• Hardware check is in progress.
• Initialization is in progress.
1. Apply power.
2. Wait for power self-test to complete.
Green Operation is normal. None.
Red Hardware check fault present. Replace device.
Indication Probable Cause Recommended Action
PROFIBUS Status
Off No power supplied.
Bus is offline. Apply power, verify network cabling, and correct, as needed.
Solid green Bus is online (data exchange). None.
Flashing green Adapter received a CLEAR command from the master. None.
Solid red Error in PROFIBUS initialization is present.
No modules installed in the backplane. Verify configuration, proper installation of modules, and
correct, as needed.