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MELSEC-Q
11 TROUBLESHOOTING
11.3.3 Error code list
When an error occurs in any processing of the QJ71MT91, the error code is stored into
its buffer memory.
This section explains the error details and corrective actions to be taken at error
occurrence.
The "Occurrence" field of the following error code table indicates that each of the errors
may occur when:
1) The programmable controller is powered ON or the basic parameters are set
2) Master function is on
3) Slave function is on
4) GX Developer connection function is on or
5) During PING test or unit test.
Occurrence
Error
Code
Error Name
Description
Lit LED
Corrective Action
1) 2) 3) 4) 5)
3E8
H
to
4FFF
H
Error code issued by programmable controller
CPU.
Refer to the QCPU User's
Manual (Hardware Design,
Maintenance and Inspection).
7301
H
Switch 1 error
The setting of the intelligent
function module switch 1
(operation mode setting) is
incorrect.
ERR.
Review the setting of the
intelligent function module switch
1.
7302
H
Switch 2 error
The setting of the intelligent
function module switch 2
(communication condition
setting) is incorrect.
ERR.
Review the setting of the
intelligent function module switch
2.
7303
H
Switch 3, 4
error
The setting of the intelligent
function module switch 3, 4 (IP
address setting) is incorrect.
ERR.
Review the setting of the
intelligent function module switch
3, 4.
7305
H
Switch 5 error
The setting of the intelligent
function module switch 5 (not
used) is incorrect.
ERR.
Delete the setting of the intelligent
function module switch 5.
7306
H
ROM check
error
An error was detected by the
ROM check made at power-
on.
ERR.
It is a QJ71MT91 hardware fault.
Please consult your local
Mitsubishi service center or
representative, explaining a
detailed description of the
problem.
7307
H
RAM check
error
An error was detected by the
RAM check made at power-on.
ERR.
It is a QJ71MT91, programmable
controller CPU or base unit
failure.
Please consult your local
Mitsubishi service center or
representative, explaining a
detailed description of the
problem.
730A
H
Parameter
starting
method error
Parameter setting using GX
Configurator-MB was made to
the programmable controller
CPU while b0, b1 of the
intelligent function module
switch 2 (communication
condition setting) was preset to
"Start with the default
parameters".
COM.ERR.
• When using the default
parameter setting, delete the
QJ71MT91 parameters set to
the programmable controller
CPU.
• When starting the QJ71MT91
with user setting parameters set
from GX Configurator-MB or
sequence program, turn ON b0,
b1 of the intelligent function
module switch 2.
(Continued on next page)
