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11
TROUBLESHOOTING
Error
Error Name
Code
Dedicated
instruction
737A
H
execution
impossible
CPU response
7380
monitoring timer
H
timeout
Function code
7381
H
error
7382
Sub-code error
H
7383
H
MODBUS device
specification error
7384
H
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Description
• 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.
• Since the QJ71MT91 on
the main base unit of a
redundant system have
been mounted, the
dedicated instruction
cannot be executed.
(When mounting the
QJ71MT91 on the main
base unit of a redundant
system, the master
function cannot be used.)
The CPU response
monitoring timer timed out in
the slave function.
The request message of the
function code not supported
by the QJ71MT91 slave
function was received.
The request message of the
sub-code not supported by
the QJ71MT91 slave
function was received.
The MODBUS device
assignment parameters
have not been set for the
MODBUS device specified
in the received request
message.
The MODBUS device
assignment parameter
setting is in process.
The range of the MODBUS
device specified in the
received request message
is outside the MODBUS
device assignment
parameter setting range.
Lit LED
Corrective Action
• Execute the dedicated
instruction after setting the
basic parameters.
• Execute the dedicated
instruction in the online
mode.
COM.ERR.
• To use the dedicated
instruction in a redundant
system, mount the
QJ71MT91 on the extension
base unit and delete the
setting of the intelligent
function module switch 5.
• If an error has occurred in the
programmable controller
COM.ERR.
CPU, remove the error.
• Set a larger CPU response
monitoring timer value.
Confirm the function code
supported by the QJ71MT91
COM.ERR.
slave function, and review the
request message to be sent.
Confirm the sub-code
supported by the QJ71MT91
COM.ERR.
slave function, and review the
request message to be sent.
• Set the MODBUS device
assignment parameters for
the MODBUS device
specified in the received
request message.
• Adjust the timing for the
request message
COM.ERR.
transmission on the master
side so that communication is
started after the MODBUS
device assignment
parameter setting existence
(XA) turns ON.
Set the MODBUS device
assignment parameter so that
the MODBUS device specified
COM.ERR.
in the received request
message is within the range.
MELSEC-Q
Occurrence
1)
2)
3)
4)
(Continued on next page)
11 - 30
5)
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