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11
TROUBLESHOOTING
No.
Symptom
3 COM. ERR. LED
Check if the MODBUS device
turned on.
assignment parameter setting, error
completed (X9) is on.
Check if the automatic communication
error status (X7) is on.
When the dedicated instruction is used,
check it for an error.
Check the error code in the error log.
Refer to "Communication with target device cannot be made even though each
parameter setting is completed.".
4 INIT. LED does
Check the basic parameter setting.
not turn on.
Check if the basic parameter setting,
error completed (X2) is on.
5 OPEN LED does
When using the automatic
not turn on.
communication function
The SD LED does
not flicker during
data transmission.
The RD LED does
When using dedicated instruction
not flicker during
data reception.
When using slave function
When using GX Developer connection
11 - 2
Check Item
Refer to "MODBUS device assignment
parameter setting, error completed (X9)
turned on."
Refer to the automatic communication
operation status storage area [0C20
0C23
where the error occurred, confirm the
error code stored in the corresponding
automatic communication error code
storage area [0C28
exception code from the target slave,
and take corrective action.
Turn off the COM. ERR. LED.
Refer to "Dedicated instruction failed.".
Turn off the COM. ERR. LED.
Take the corresponding corrective
action.
Turn off the COM. ERR. LED.
Set the basic parameters from GX
Configurator-MB or from the sequence
program.
In the setting of intelligent function
module switch 2 (communication
condition setting) - b0: Basic parameter
starting method, select "OFF: Start with
the default parameters".
Refer to "Basic parameter setting, error
completed (X2) turned on.".
Refer to "Automatic communication
parameter setting, error completed (X5)
turned on." or "Automatic
communication operation status (X6)
does not turn on.".
Refer to "Dedicated instruction is not
executed.".
Refer to "Slave function of QJ71MT91
does not return response message to
request message.".
Refer to "GX Developer cannot be
connected.".
Corrective Action
], identify the parameter number
H
to 0C67
] or the
H
H
MELSEC-Q
Reference
Section
11
This section
(2)-6
to
H
Section 11.3.1
This section
(3)-2
Section 11.3
This section
(3)-6
Chapter 7
Chapter 8
Section 9.1.1
Section 6.6
This section
(2)-3
This section
(2)-5, (2)-7
This section
(3)-1
This section
(3)-3
This section
(3)-4
11 - 2
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