Rockwell Automation 1756-DH485 ControlLogix Data Highway 485 Module Installation Instructions - Manual (Page 16)

16 ControlLogix DH-485 Communications Module
Publication 1756-IN587A-EN-P - September 2005
Troubleshoot the Power Supply
If the alphanumeric indicator on the 1756-DH485 module does not cycle
through these messages when you turn the power on, refer to the Power
Supply Status table and to the Troubleshooting section that follows.
Interpret the Alphanumeric Display
Your 1756-DH485 module displays alphanumeric codes that provide
diagnostic information about your module. The alphanumeric display flashes
the codes at approximately one second intervals. Table Alphanumeric Display
Descriptions summarizes the codes.
Power Supply Status
POWER Indicator Power Supply Status Recommended Action
Off Not operating. Turn power switch ON.
Check power wiring connections.
Check fuse.
On Operating. None, normal operation.
Alphanumeric Display Descriptions
Code Description Recommended Action
OFF
LINE
DH-485 link is in STOP state. Correct the configuration.
Refer to the 1756-DH485 User Manual,
publication 1756-UM532.
DUPL
NODE
DH-485 Duplicate node
address. Choose another node address and reset
switches.
ONLY
NODE
Only node on DH-485 link. Check the cables.
CNFG
FALT
Incorrect DH-485 routing table
configuration.
Incorrect DH-485 object
configuration.
Correct the configuration. Refer to the
1756-DH485 user manual, pub. 1756-UM532.
Verify the module is inserted in correct slot.