Troubleshoot the power supply, Interpret the alphanumeric display – Rockwell Automation 1756-DHRIO ControlLogix Data Highway Plus-Remote I/O Communication Interface Module I.I. User Manual
Page 15
ControlLogix Data Highway Plus-Remote I/O Communication Interface Module 15
Publication
1756-IN003D-EN-P - July 2008
Troubleshoot the Power Supply
If the alphanumeric indicator on the 1756-DHRIO module does not cycle
through these messages on powerup, refer to the following table and to the
Troubleshooting section that follows.
Interpret the Alphanumeric Display
Your 1756-DHRIO module displays alphanumeric codes that provide
diagnostic information about your module. The alphanumeric display flashes
the codes at approximately 1 second intervals. The following table
summarizes the codes.
If the POWER
indicator is
Power Supply Status is
Recommended Action
Off
Not operating.
Turn power switch ON.
Check power wiring connections.
Check fuse.
On
Operating.
None, normal operation.
Code
Description
Recommended Action
Data Highway Plus
OFF
LINE
Data Highway Plus link
is in STOP state.
Correct the configuration.
Refer to the
DUPL
NODE
Data Highway Plus
Duplicate node
address.
Choose another node address and reset
switches.
ONLY
NODE
Only node on Data
Highway Plus link.
Check the cables.