9 Troubleshooting and Maintenance
9-14
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 NS indicator will flash red if the error occurs during remote I/O communications, otherwise the indicator will be OFF.
Indicators Error
category
Error Likely cause DeviceNet Unit
response
Error
log
(Hex)
MS NS 7-seg-
ment
*1
- OFF or
Red
(flashing)
*2
E2 Network Transmis-
sion time-
out error
A transmission request
was not completed nor-
mally for one of the follow-
ing reasons:
• There is not even one
device such as a slave in
the network.
• The communications
speed settings are not
the same in all of the
nodes.
• CAN controller error
As long as transmission
timeout is in effect, remote
I/O communications will
remain stopped and errors
will be returned in
response to requests for
message transmissions.
The indicator status, scan-
ning, and message pro-
cessing will return to
normal when the transmis-
sion timeout returns to nor-
mal, although scanning will
not resume if the
DeviceNet Unit is set to
stop remote I/O communi-
cations when a communi-
cations error occurs.
0342
Red
(flashing)
- E6 Memory
access
Message
monitoring
timer list
logic error
There is an error in the
contents of the message
monitoring timer list stored
in non-volatile memory.
Records the error in the
error log.
Operation will continue
using the default message
monitoring timer values.
021A
Red
(flashing)
- E7 Slave scan
list logic
error
There is an error in the
contents of the slave scan
list stored in non-volatile
memory.
• Records the error in the
error log.
• The slave remote I/O
communications will be
stopped.
• Message processing
and the exchange of
data with the CPU Unit
will continue. Normal
operation will resume
when the slave scan list
is written normally. (Start
the slave remote I/O
communications.)
021A
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