Allen-Bradley 1734-OB2, User Manual, Page: 149 / 221

Rockwell Automation Publication 1734-UM001E-EN-P - July 2013
Troubleshoot with the Indicators 151
Subnet and POINTBus Status
Off Device is not online.
• Device has not completed Dup_MAC_ID test.
• Device is not powered - check module status indicator.
Check adapter status indicator to determine if more
time is needed to complete the dup_MAC_id test
or if the adapter needs to be powered.
Flashing green Device is online but has no connections in the established state. None.
Solid green Device is online and has connections in the established state. None.
Flashing red No scanlist is available. I/O module is missing. 1. Make sure all I/O modules are connected and
using the correct MAC IDs.
2. Check Cycling Node Status parameter in
RSNetWorx for DeviceNet software.
Solid red Critical link failure - failed communication device present. Device detected
error that prevents it from communicating on the network. 1. Make sure an I/O module is not using a
MAC ID = 0.
2. Make sure all backplane modules are
communicating at the proper communication
rate.
Indicator Indication Probable Cause Recommended Action
System Power Off 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-ADN(X) adapter.
Green System power is on. DC-DC converter is active (5V). None.
Field Power Off Field power is off. Turn field power on.
Green Power is on with 24V present. None.