MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 140)

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MELSEC-Q
5 DATA USED FOR POSITIONING CONTROL
Pr.48 OPR retry
Set whether to carry out OPR retry.
When the OPR retry function is validated and the machine OPR is started, first the
axis will move in the OPR direction (1)). If the upper/lower limit signal turns OFF
before the near-point dog signal ON is detected (2)), the axis will decelerate to a
stop, and then will move in the direction opposite to the specified OPR direction
(3)). If the falling edge of the near-point dog signal is detected during movement in
the opposite direction, the axis will decelerate to a stop (4)), and will carry out
machine OPR again (5), 6)).
ON
Start position
Near-point dog signal
Limit signal OFF state
Zero signal
5)
4)
6)
1)
2)
3)
[Operation for OPR retry function]
1) Movement in the OPR direction starts with the machine OPR start.
2) The axis decelerates when the limit signal OFF is detected.
3) After stopping at detection of the limit switch signal OFF, the axis moves at the OPR
speed in the direction opposite to the specified OPR direction.
4) The axis decelerates when the near-point dog signal turns OFF.
5), 6) After stopping with the near-point dog signal OFF, carries out machine OPR in the
OPR direction.