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11
TROUBLESHOOTING
Error
Error Name
Code
73C0
RAM error
H
73C1
ROM error
H
Self-loopback
73C2
H
test error
73C8
H
73C9
H
73CA
H
Offline mode
error
73CB
H
73CC
H
73CD
H
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Description
An error was detected in the
RAM test.
An error was detected in the
ROM test.
An error was detected in the
self-loopback test.
In the offline mode,
parameters were set by GX
Configurator-MB.
In the offline mode, Basic
parameter setting request
(Y1) was turned on.
In the offline mode, Automatic
communication parameter
setting request/Automatic
communication start request
(Y4) was turned on.
In the offline mode, Automatic
communication stop request
(Y6) was turned on.
In the offline mode, MODBUS
device assignment parameter
setting request (Y8) was
turned on.
In the offline mode, PING test
execution request (Y1C) was
turned on.
Lit LED
Corrective Action
Counter the problem in the
ERR.
following procedure.
• Check whether or not the
ERR.
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
capacity is sufficient or not.
• Perform the test again.
• If the above does not solve
COM.ERR.
the problem, a probable cause
is a hardware error.
Check if the programmable
controller CPU and base unit
are normal referring to the
manual for each module.
Or, replace either of the
modules to check the
operation.
In case of failure, please
consult your local Mitsubishi
representative.
In the offline mode, delete GX
Configurator-MB parameters
COM.ERR.
set in the programmable
controller CPU.
Do not turn on Basic parameter
COM.ERR.
setting request (Y1) in the
offline mode.
Do not turn on Automatic
communication parameter
COM.ERR.
setting request/Automatic
communication start request
(Y4) in the offline mode.
Do not turn on Automatic
COM.ERR.
communication stop request
(Y6) in the offline mode.
Do not turn on MODBUS
device assignment parameter
COM.ERR.
setting request (Y8) in the
offline mode.
Do not turn on PING test
COM.ERR.
execution request (Y1C) in the
offline mode.
MELSEC-Q
Occurrence
1)
2)
3)
4)
5)
(Continued on next page)
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