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11
TROUBLESHOOTING
Error
Error Name
Code
Slave function
7396
H
busy
739C
H
to
System error
739E
H
PING test
73B1
H
setting error
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Description
The QJ71MT91 received
request messages that
exceed the number of
simultaneously receivable
request messages (64).
The OS of the QJ71MT91
detected error.
The settings (communication
time check, transmission
count, IP address) of the
PING test are incorrect.
Lit LED
Corrective Action
Retry after a little while on the
master side from which the
COM.ERR.
request message was sent.
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.
Review the settings of the
COM.ERR.
PING test.
MELSEC-Q
Occurrence
1)
2)
3)
4)
5)
(Continued on next page)
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