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MELSEC-Q
15 TROUBLESHOOTING
15.2 List of errors
The following table shows the error details and remedies to be taken when an error
occurs.
15.2.1 QD75MH detection error
Classification
of errors
Error
code
Error name Error Operation status at error occurrence
— 000 (Normal status) — —
001 Fault
Fatal errors
002 Internal circuit fault
Hardware fault. The system stops.
101
PLC READY signal
OFF during
operation
The 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
Servo READY signal
OFF during
operation
The Servo 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 input turned OFF.
105
Hardware stroke
limit (–)
The hardware stroke limit (lower limit
signal RLS) is input 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.
107
READY OFF
ON
during BUSY signal
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.
Common
errors
108 Impossible to start
Start is requested when start is not
possible in the axis operation state.
The system does not start positioning.