350
Using the LED Indicators and Display for Troubleshooting Section 14-2
Flashing
red
--- HE CPU Unit ser-
vice monitor-
ing error
Servicing from
the CPU Unit
was not com-
pleted within the
fixed interval.
The monitoring
time is normally
11 s.
• If the Unit is the orig-
inator of the tag data
link connection, it
stops communica-
tions.
• If the Unit is the tar-
get of the tag data
link connection and
the PLC status is
included in the com-
munications data,
the corresponding
Target Node PLC
Error Flag will be
turned ON.
Note:
Recovery is possible
for this error. When
operation is restored,
tag data link startup
processing will be
performed and opera-
tions will return to
normal.
0002 Check and correct
the CPU Unit’s
operating environ-
ment.
Flashing
red
--- HF CPU Unit
watchdog
timer error
An error
occurred in the
CPU Unit.
• If the Unit is the orig-
inator of the tag data
link connection, it
stops communica-
tions.
• If the Unit is the tar-
get of the tag data
link connection and
the PLC status is
included in the com-
munications data,
the corresponding
Target Node PLC
Error Flag will be
turned ON.
0001 Replace the CPU
Unit.
Indicator Error Cause Unit operation (Flag
status)
Error
log
(hex)
Countermeasure
MS NS 7-segment
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