Mitsubishi QJ71C24N - The RUN LED Is Turned off

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MELSEC-Q
11 TROUBLESHOOTING
11.3.1 The "RUN" LED is turned OFF.
Symptom Cause Corrective action
MC
Bidirectional
Non
procedure
Pre-defined
• A transmission setting
switch is set to an
unusable position.
• Set the switch by GX Developer correctly
and after writing to the CPU reset the CPU.
• Programmable
controller CPU error.
• Remove the cause of the CPU error and
reset the CPU.
Note
• During the Q series C24 and external
device loopback test, the minimum
parameters file must be written to the
CPU beforehand.
• Power module 5 V
current capacity is
insufficient.
• Calculate the 5 V current drain of each
installed module. If the current capacity is
insufficient, check power module selection.
Note
• Whether or not the current capacity is
insufficient can be checked by
disconnecting the expansion base and
installing only the Q series C24 to the
basic base.
• The Q series C24
"RUN" LED turned off.
• Extraneous noise
caused the Q series
C24 to abnormal
operation.
• Check if the shield wire is 2-point ground.
• When ground is used with other devices,
ground the Q series C24 independently.