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11
TROUBLESHOOTING
Error
Error Name
Code
IP address
7472
H
setting error
Connection
7473
H
not open
7474
TCP
H
connection
forcibly
disconnected
7475
H
7480
H
to
System error
75FF
H
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Description
The host address bits of the
IP address of the request
message transmission
destination are all "0" or all
"1".
• The connection not open
was used to send data.
• The connection used to
send data was already
closed.
The TCP connection was
disconnected forcibly from
the target device.
(This error may be ignored
when no problems arise from
this error.)
The OS of the QJ71MT91
detected error.
REMARK
(1) Refer to Section 11.3.1 for the error code storage areas.
(2) Refer to Chapter 7 for details of the parameter setting ranges.
Lit LED
Corrective Action
Correct the target IP address
set to the dedicated
instruction's control data or
COM.ERR.
automatic communication
parameter.
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
• Retry after a little while.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
COM.ERR.
error.
• As the line may be busy, retry
after a little while.
Counter the problem in the
following procedure.
• Check whether or not the
QJ71MT91, power supply
module and CPU module are
mounted correctly on the base
unit.
• Check whether or not the
operating environment of the
system is within the range of
general specifications of the
CPU module.
• Check whether the power
COM.ERR.
capacity is sufficient or not.
• Check the QJ71MT91, CPU
module and base unit to see if
the hardware is normal
according to the manual of
each module.
If the module is faulty, please
consult your local Mitsubishi
representative.
• If the problem cannot be
resolved in the above steps,
please consult your local
Mitsubishi representative.
MELSEC-Q
Occurrence
1)
2)
3)
4)
5)
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