Allen-Bradley 1756-DHRIO - Interpreting the Alphanumeric Indicators

Publication 1756-UM514B-EN-P - February 2003
12-2 Troubleshooting the 1756-DHRIO Module
If the alphanumeric indicator on the 1756-DHRIO module does not
cycle through these messages on power-up, refer to the following
table and to the Troubleshooting section that follows.
Interpreting the
Alphanumeric Indicators
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.
Table 12.1
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.
Table 12.2
Interpreting the Alphanumeric Display
Code Description Recommended Action
Data Highway Plus
OFF
LINE
Data Highway Plus
link is in STOP state.
Correct the configuration.
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.
CNFG
FALT
Incorrect DH+ routing
table configuration.
Incorrect Data
Highway object
configuration.
Correct the configuration.
Verify the module is inserted in correct
slot.
OK Normal operation for
that channel.
None.
LINK
OFF
Channel B is disabled
because Channel A is
used for 230k
operation.
None