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MELSEC-Q
15 TROUBLESHOOTING
15.2 List of errors

The following table shows the error details and remedies to be ta ken wh en an erro r

occurs.

Classification
of errors Error
code Error name Error Operation status at error occurrence
000 (Normal status)
001 Faults
Fatal errors 002 Internal circuit fault Hardware is faulty. The system stops.
101 PLC READY OFF
during operation A PLC READY signal (Y0) is turned
OFF during operation.
The system stops with the setting
(deceleration stop/sudden stop) of the
detailed parameter 2 Sudden stop
selection (stop group 2).
(Note that the deceleration stop only
occurs during the manual pulse
generator operation.)
102 Drive unit READY
OFF The drive unit READY signal is
turned OFF during operation. The system stops immediately.
103 Test mode faults
during operation The personal computer cannot
communicate with the CPU unit.
The system stops with the setting
(deceleration stop/sudden stop) of the
detailed parameter 2 Sudden stop
selection (stop group 2).
(Note that the deceleration stop only
occurs during the manual pulse
generator operation.)
104 Hardware stroke
limit (+) The hardware stroke limit (upper limit
signal FLS) is turned OFF.
105 Hardware stroke
limit (–) The hardware stroke limit (lower limit
signal RLS) is turned OFF.
The system stops with the setting
(deceleration stop/sudden stop) of the
detailed parameter 2 Sudden stop
selection (stop group 1).
(Note that the deceleration stop only
occurs during the manual pulse
generator operation.)
106 Stop signal ON at
start Start is requested when a stop signal
is turned ON. The system does not start positioning.
Common
107 READY OFF ON
during BUSY
The PLC READY signal is turned
from OFF to ON when BUSY signal
is turned ON.
The QD75 READY signal (X0) is not
turned ON.
OPR 201 Start at OP
When the OPR retry invalid is set,
the near-point dog machine OPR is
started with the OPR complete flag
turned ON.
The machine OPR is not started.