Mitsubishi Electric QD77MS User Manual page 693

1) When the direction from the workpiece to the OP is the same as the "[Pr.44] OPR direction", a
normal machine OPR is carried out.
Machine OPR start
Hardware lower limit switch
2) When the direction from the workpiece to the OP is the opposite direction from the "[Pr.44] OPR
direction", the operation carries out a deceleration stop when the near-point dog turns OFF, and
then carries out a machine OPR in the direction set in "[Pr.44] OPR direction".
Pr. 44 OPR direction
Hardware lower limit switch
In the a
bove example 1) and 2), "0: Positive direction" is set in "[Pr.44] OPR direction"
REMARK

When the "0: Positive direction" is selected in "[Pr.44] OPR direction", the upper limit switch is set
to the limit switch in the OPR direction.

When the "1: Negative direction" is selected in "[Pr.44] OPR direction", the lower limit switch is
set to the limit switch in the OPR direction.
 If inverting the install positions of upper/lower limit switches, hardware stroke limit function cannot
be operated properly.
If any problem is found for OPR operation, review "Rotation direction selection/travel direction
selection (PA14)" and the wiring for the upper/lower limit switch.
Fig. 13.2 OPR retry operation from on limit (limit signal OFF)
(2) OPR retry operation when the workpiece is outside the range between the
upper and lower limits.
Pr. 44 OPR direction
Near-point dog
Movement range
Near-point dog
Movement range
Zero signal
Zero signal
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Chapter 13 Control Sub Functions
OP
Hardware upper limit switch
Machine OPR start
OP
Hardware upper limit switch