9 Troubleshooting and Maintenance
9-24
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
*1 The 7-segment indicator will alternate between the Unit's node address and the code given in the tables in this section.
*2 The CPU Unit's watchdog timer error can occur during initialization.
Indicators Error
category
Error Likely cause DeviceNet Unit
response
Error
log
(Hex)
MS NS 7-seg-
ment
*1
Red
(flashing)
-
HE CPU Unit
exchange
CPU Unit
service
monitoring
error
Servicing from the CPU
Unit is not performed at
fixed intervals. Servicing is
normally monitored per-
formed at 11 s.
• Records the error in the
error log.
• Stops master and slave
remote I/O communica-
tions.
Performs the following pro-
cessing if it receives com-
mands that must be
passed along to the CPU
Unit:
• Returns an error
response (0302 Hex) to
commands requiring a
response.
• Discards other frames
and stores an error
record (010B Hex) in the
error log.
Note Remote I/O commu-
nications will not
restart automatically
for this error. First
confirm that the error
has been eliminated
and then perform the
procedure to start
remote I/O communi-
cations.
0002
Red
(flashing)
- HF CPU Unit
watchdog
timer error
An error occurred in the
CPU Unit.
*2
• Records the error in the
error log.
• Stops master and slave
remote I/O communica-
tions.
Performs the following pro-
cessing if it receives com-
mands that must be
passed along to the CPU
Unit:
• Returns an error
response (0302 Hex) to
commands requiring a
response.
• Discards other frames
and stores an error
record (010B Hex) in the
error log.
0001
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