Owner manual

ControlLogix-XT Data Highway Plus-Remote I/O Interface Module 21
Publication
1756-IN638A-EN-P - March 2009
Alphanumeric Display Codes
Your 1756-DHRIOXT module displays alphanumeric codes that
provide diagnostic information. The alphanumeric display flashes the
codes at approximately 1-second intervals. These tables describe
codes and interpretations specific to the application of the module.
Data Highway Plus Codes and Interpretations
Code Description Recommended Action
OFF
LINE
Data Highway Plus link is in
STOP state.
Correct the configuration. Refer to the
1756-DHRIO User Manual, publication
1756-UM514.
DUPL
NODE
Data Highway Plus Duplicate
no
de address.
Choose another node address and reset
switches.
ONLY
NODE
Only node on Data Highway
Plus link.
Check the cables.
CNFG
FALT
Incorrect DH+ routing table
conf
iguration.
Incorrect Data Highway
ob
ject configuration.
• Correct the configuration. Refer to the
1756-DHRIO User Manual, publication
1756-UM0514.
• Verify that the module is inserted in
the correct slot.
OK Normal operation for that
chan
nel.
None.
LINK
OFF
Channel B is disabled
be
cause Channel A is used
for 230k DH+ operation.
None.