Mitsubishi Electric QJ71MB91 User Manual page 314

11
TROUBLESHOOTING
No. Symptom
The diagnostic counter
5
has counted up.
An error is found in the
6 communications event
log.
Communication with the
target device is not
7 available even if
parameter setting has
been completed normally.
11
- 8 11.1 Troubleshooting
Table11.3 Troubleshooting for other symptoms (Continued)
Check point
Bus communication error
count
Character overrun error count
Master/
Slave
Data discard count
Failed transmission count
Communication error occurred.
Character overrun error occurred.
Message error occurred.
Processing interrupt occurred.
Is the station number setting correct?
Check if the transmission settings of the
QJ71MB91 are consistent with those of
the target device.
Is the frame mode setting (RTU mode/
ASCII mode) correct?
Corrective action
Check the Error log (address: 0CFE
0DFF ) in the buffer memory and take
H
corrective actions for the error code.
Refer to the corrective actions for the
character overrun error (error code:
7399 )
H
• If it is caused by connecting the module
to the online network, powering it on
and accessing the network, do not
perform such kind of operation. No
specific action is necessary if there is no
problem.
• If it is caused by turning off, resetting or
disconnecting the device in
transmission from the line, reset, do not
perform such kind of operation during
transmission. No specific action is
necessary if there is no problem.
• If the message is erroneous, refer to
"Communication with the target device
is not available even if parameter setting
has been completed normally.".
Refer to the corrective actions for the CS
signal OFF error (error code: 7403
Check the Error log (address: 0CFE
0DFF ) in the buffer memory and take
H
corrective actions for the error code.
Refer to the corrective actions for the
character overrun error (error code:
7399 )
H
Check the Error log (address: 0CFE
0DFF ) in the buffer memory and take
H
corrective actions for the error code.
If there is a problem with the setting,
correct the intelligent function module
switch setting and reset the module.
Check the settings again and if there is a
problem with the setting, correct the
intelligent function module switch setting
and reset the module.
If there is a problem with the setting,
correct the intelligent function module
switch setting and reset the module.
(Continued on next page)
Reference
to
H
Section 11.4.1
Section 11.3
Section 11.4.3
This section
(3)-7
Section 11.4.3
)
H
to
H
Section 11.4.1
Section 11.4.3
to
H
Section 11.4.1
Section 6.6
Section 6.6
Section 6.6