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11
TROUBLESHOOTING
Error
Error Name
Code
Request
734F
message size
H
setting error
Automatic
communication
7351
H
function start
interruption
Basic
7352
parameter not
H
set
Redundant
7353
H
setting error
Exception
7360
message
H
reception
Byte count
7361
H
error
Reference
7362
H
number error
11 - 28
Description
The request message size
specified in the argument
((S2)+0) of the MBREQ
instruction is incorrect.
The start of the automatic
communication function was
interrupted due to the
processing of the basic
parameter setting.
The automatic
communication function was
started or stopped without the
basic parameter being set.
The automatic
communication function was
started when parameter
setting was being made on
GX Configurator-MB at
power-on.
When the QJ71MT91 on the
main base unit of a redundant
system is mounted, the
automatic communication
function of the master
function was attempted to be
executed.
When the automatic
communication function or
dedicated instruction is used,
the target slave device
returned an exception code in
reply to the request message
sent by the QJ71MT91.
In the automatic
communication function or
dedicated instruction, the
number of bytes in the
received response message
is less or more than
necessary.
The value of the reference
number in the response
message received by the
dedicated instruction is
incorrect.
Lit LED
Corrective Action
Review the setting of the
COM.ERR.
request message size.
After turning ON the Automatic
communication parameter
setting request/Automatic
communication start request
(Y4), do not turn ON the Basic
COM.ERR.
parameter setting request (Y1)
until the Automatic
communication operation status
(X6) turns ON.
Start or stop the automatic
communication function with
COM.ERR.
Basic parameter setting
existence (X3) on.
When using GX Configurator-
MB, switch the power on and
then turn on Automatic
communication parameter
setting request/Automatic
COM.ERR.
communication start request
(Y4) after Basic parameter
setting existence (X3) has
turned on.
Delete the automatic
communication parameter
setting. (When mounting the
QJ71MT91 on the main base
COM.ERR.
unit of a redundant system, the
master function cannot be
used.)
• Refer to the exception code
returned from the target slave
device, and resolve the
problem.
COM.ERR.
• Resolve the problem that
occurred in the target slave
device.
COM.ERR.
On the target slave side, check
whether the contents of the
returned response message are
correct or not.
COM.ERR.
MELSEC-Q
Occurrence
1)
2)
3)
4)
(Continued on next page)
11 - 28
5)
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