13 Troubleshooting
13-12
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
* The 7-segment display alternates between the node address and error code.
Indicator
Error Cause Unit operation
Error log
(hex)
Countermeasure
MS NS
7-seg-
ment*
Errors Related to CPU Unit Data Exchange
Flash-
ing red
--- HE CPU Unit service
monitoring error
Servicing from the
CPU Unit was not
completed within the
fixed interval. The
monitoring time is
normally 11 s.
• If the Unit is the origina-
tor of the tag data link
connection, it stops
communications.
• Communications will
continue for target con-
nection. If the Unit is
the target of the tag
data link connection
and the Controller sta-
tus is included in the
communications data,
the corresponding ele-
ment in the Target
Node PLC Error Flags
will change to TRUE.
Note Recovery is possi-
ble for this error.
When operation is
restored, tag data
link startup pro-
cessing will be per-
formed and
operations will
return to normal.
0002 Check and correct
the CPU Unit's oper-
ating environment.
Flash-
ing red
--- HF CPU Unit watch-
dog timer error
An error occurred in
the CPU Unit.
• If the Unit is the origina-
tor of the tag data link
connection, it stops
communications.
• Communications will
continue for target con-
nection. If the Unit is
the target of the tag
data link connection
and the Controller sta-
tus is included in the
communications data,
the Target Node PLC
Error Flags will change
to TRUE.
0001 Replace the CPU
Unit.
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