Status indicators – Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module User Manual
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Rockwell Automation Publication 1756-UM514C-EN-P - June 2014
Chapter 13
Troubleshooting the Module
Status Indicators
The following figure and tables describe the module status indicators.
If after powerup, the alphanumeric indicator does not start cycling (or if it stops
cycling) through these messages, see the following tables.
Data Highway Plus
Sequence of display
Where
A DH
A#xx
xxxx
A is the channel (A or B) and DH indicates network type is DH+.
xx is the channel’s node address.
xxxx is the channel’s status message.
Remote I/O
Sequence of display
Where
BIO
SCAN
xxxx
B is the channel (A or B) and IO indicates network type is Remote I/O.
SCAN indicates scanner.
xxxx is the channel’s status message.
Power Supply Indicator
If the power indicator is:
Power supply is:
Take this action:
Off
Not operating
Turn power switch ON.
Check power wiring connections.
Check fuse.
On
Operating
None; normal operation
Alphanumeric Indicator Status Message - Data Highway Plus
If the alphanumeric
indicator status message
shows:
Network status is:
Take this action:
OFF
LINE
Data Highway Plus link is in STOP state.
Correct the configuration.
DUPL
NODE
Data Highway Plus Duplicate node
address.
Select another node address and reset
switches.
ONLY
NODE
Only node on Data Highway Plus link.
Check cables.
CNFG
FALT
Incorrect Data Highway Plus routing
table configuration.
Incorrect Data Highway object
configuration.
Verify the module is inserted into the
correct slot.
OK
Normal operation for that channel.
None.
CHA CHB
OK
H+/RIO
43241
Power Supply Indicator is
green.
Alphanumeric Status Indicator illuminates and cycles through a
sequence of messages.
Module OK status indicator is solid red,
then flashing green.