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MELSEC-Q
11 TROUBLESHOOTING
Occurrence
Error
Code
Error Name
Description
Lit LED
Corrective Action
1) 2) 3) 4) 5)
7365
H
Module ID
mismatch error
In the automatic
communication function or
dedicated instruction, the
"module ID" in the MBAP
header of the received
response message does not
match the request message.
COM.ERR.
7366
H
Function code
mismatch error
In the automatic
communication function or
dedicated instruction, the
function code of the received
response message does not
match the request message.
COM.ERR.
7367
H
Response
message
contents
mismatch error
In the automatic
communication function or
dedicated instruction, the
contents of the received
response message does not
match the request message.
(FC: 15, FC: 16, FC: 21)
COM.ERR.
On the target slave side, check
whether the contents of the
returned response message are
correct or not.
7370
H
Automatic
communication
function stop
request error
The automatic communication
stop request (Y6) was made
with the automatic
communication function
stopped.
COM.ERR.
When the automatic
communication function is
stopped, do not make the
automatic communication stop
request (Y6).
7371
H
Automatic
communication
parameter
setting request
error
The automatic communication
parameter setting
request/automatic
communication start request
(Y4) was made with the
automatic communication
function ON.
COM.ERR.
After stopping the automatic
communication function, make
the automatic communication
parameter setting
request/automatic
communication start request
(Y4).
7378
H
The response monitoring timer
timed out in the automatic
communication function.
COM.ERR.
7379
H
Response
monitoring
timer time-out
error
The response monitoring timer
timed out in the dedicated
instruction.
COM.ERR.
• Conduct a PING test, etc. to
check whether the target device
exists or not.
• If an error has occurred in the
target device, remove the error.
• Set a larger response
monitoring timer value.
737A
H
Dedicated
instruction
execution
impossible
• Since the basic parameters
have not yet been set, the
dedicated instruction cannot
be executed.
• The dedicated instruction
cannot be executed due to
the offline mode.
COM.ERR.
• Execute the dedicated
instruction after setting the basic
parameters.
• Execute the dedicated
instruction in the online mode.
7380
H
CPU response
monitoring
timer time-out
The CPU response monitoring
timer timed out in the slave
function.
COM.ERR.
• If an error has occurred in the
programmable controller CPU,
remove the error.
• Set a larger CPU response
monitoring timer value.
7381
H
Function code
error
The request message of the
function code not supported by
the QJ71MT91 slave function
was received.
COM.ERR.
Confirm the function code
supported by the QJ71MT91
slave function, and review the
request message to be sent.
(Continued on next page)