9 Troubleshooting and Maintenance
9-8
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 When a (master function) structure error or verification error occurs, only the most recent error is displayed for each slave.
If the Unit is set to stop the remote I/O communications for a communications error, two errors can be displayed: The
slave's communications error and its most recent error.
Indicators Error
category
Error Likely cause DeviceNet Unit
response
Error
log
(Hex)
MS NS 7-seg-
ment
*1
-Red
(flashing)
d2 Structure
error
*2
(Unsup-
ported
slave)
The size of the slave's
input and/or output area
exceeded 200 bytes.
(Occurs with the scan list
disabled.)
The master will periodi-
cally attempt to reconnect
with the slave with the
structure error.
0343
-Red
(flashing)
d5 Verification
error
*2
(Non-exis-
tent slave)
A slave registered in the
scan list doesn't exist or
the local node's (master's)
node address is regis-
tered in the scan list.
(Occurs with the scan list
enabled.)
• If a slave is involved, the
master will periodically
attempt to reconnect.
• If the master is involved,
it will not send an OPEN
frame to itself.
0344
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