Mitsubishi Electric QJ71MB91 User Manual page 313

Modbus interface module
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11
TROUBLESHOOTING
No.
Symptom
The diagnostic counter
5
has counted up.
Table11.3 Troubleshooting for other symptoms (Continued)
Check point
Received exception error
count
No-response count
Received NAK count
Received busy count
Master
Message discard count
Message discard count
Slave
Exception error count
Corrective action
Check the exception code returned from
the slave by the Error log (address: 0CFE
to 0DFF
) in the buffer memory, and
H
examine the slave to solve the problem.
Refer to the corrective actions for the
response monitoring timer timeout error
(error code: 7378
to 7379
).
H
H
Examine the slave that returned the error,
and solve the problem.
• When there is another master on the
same network, disconnect the master.
• When a response is returned after
occurrence of the response monitoring
timer timeout error, refer to the
corrective actions for the error (error
code: 7378
to 7379
).
H
H
• When any of the other stations has sent
a message without receiving a request,
examine the station.
There is no problem as messages
addressed to other stations are discarded.
Check the Error log (address: 0CFE
0DFF
) in the buffer memory and take
H
corrective actions for the error code.
(Continued on next page)
11.1 Troubleshooting
9
Reference
Section 11.3
10
H
Section 11.4.1
Section 11.3
Section 11.4.3
11
-
Section 11.3
Section 11.4.3
Section 11.3
to
H
Section 11.4.1
11
- 7

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