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11
TROUBLESHOOTING
Error
Error Name
Code
Protocol ID
7363
H
error
Module ID
7365
H
mismatch error
Function code
7366
H
mismatch error
Response
message
7367
H
contents
mismatch error
Automatic
communication
7370
H
function stop
request error
Automatic
communication
7371
parameter
H
setting request
error
7378
H
Response
monitoring
timer timeout
error
7379
H
11 - 29
Description
In the automatic
communication function or
dedicated instruction, the
protocol ID of the received
response message is other
than "0: MODBUS protocol".
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.
In the automatic
communication function or
dedicated instruction, the
function code of the received
response message does not
match the request message.
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)
The automatic communication
stop request (Y6) was made
with the automatic
communication function
stopped.
The automatic communication
parameter setting
request/automatic
communication start request
(Y4) was made with the
automatic communication
function ON.
The response monitoring timer
timed out in the automatic
communication function.
The response monitoring timer
timed out in the dedicated
instruction.
Lit LED
Corrective Action
COM.ERR.
COM.ERR.
On the target slave side, check
whether the contents of the
returned response message are
correct or not.
COM.ERR.
COM.ERR.
When the automatic
communication function is
COM.ERR.
stopped, do not make the
automatic communication stop
request (Y6).
After stopping the automatic
communication function, make
the automatic communication
COM.ERR.
parameter setting
request/automatic
communication start request
(Y4).
• Conduct a PING test, etc. to
COM.ERR.
check whether the target device
exists or not.
• If an error has occurred in the
target device, remove the error.
COM.ERR.
• Set a larger response
monitoring timer value.
MELSEC-Q
Occurrence
1)
2)
3)
4)
(Continued on next page)
11 - 29
5)
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