Mitsubishi QJ71MB91, User Manual

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11
TROUBLESHOOTING
11.1 Troubleshooting
11
- 8
9
P
R
OGRAM
M
ING
10
D
E
DICA
TED
INSTRUC
TI
ONS
11
TR
O
U
BLE
S
HOOTING
A
P
P
E
NDICE
S
INDE
X
(Continued on next page)
Table11.3 Troubleshooting for other symptoms (Continued)
No. Symptom Check point Corrective action Reference
5
The diagnostic counter
has counted up. Master/
Slave
Bus communication error
count
Check the Error log (address: 0CFE
H
to
0DFF
H
) in the buffer memory and take
corrective actions for the error code.
Section 11.4.1
Character overrun error count
Refer to the corrective actions for the
character overrun error (error code:
7399
H
)
Section 11.3
Section 11.4.3
Data discard count
• 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.".
This section
(3)-7
Failed transmission count
Refer to the corrective actions for the CS
signal OFF error (error code: 7403
H
)
Section 11.4.3
6
An error is found in the
communications event
log.
Communication error occurred.
Check the Error log (address: 0CFE
H
to
0DFF
H
) in the buffer memory and take
corrective actions for the error code.
Section 11.4.1
Character overrun error occurred.
Refer to the corrective actions for the
character overrun error (error code:
7399
H
)
Section 11.4.3
Message error occurred. Check the Error log (address: 0CFE
H
to
0DFF
H
) in the buffer memory and take
corrective actions for the error code.
Section 11.4.1
Processing interrupt occurred.
7
Communication with the
target device is not
available even if
parameter setting has
been completed normally.
Is the station number setting correct?
If there is a problem with the setting,
correct the intelligent function module
switch setting and reset the module.
Section 6.6
Check if the transmission settings of the
QJ71MB91 are consistent with those of
the target device.
Check the settings again and if there is a
problem with the setting, correct the
intelligent function module switch setting
and reset the module.
Section 6.6
Is the frame mode setting (RTU mode/
ASCII mode) correct?
If there is a problem with the setting,
correct the intelligent function module
switch setting and reset the module.
Section 6.6