Mitsubishi Electric MELSEC-L LD75P User Manual page 514

(b) OPR retry operation when the workpiece is outside the range between the
upper/lower limits.
The OPR retry operations below are examples where "[Pr.44] OPR direction" is set to "0: Positive direction".
• 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.
Lower limit
• 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".
Lower limit
When "0: Positive direction" is set in [Pr.44] check that the limit switch placed in the OPR direction acts as the upper limit.
When "1: Negative direction" is set in [Pr.44], check that the limit switch placed in the OPR direction acts as the lower limit.
Incorrect wiring of these limit switches may cause improper OPR retry operation.
If any malfunction is identified, check and correct "[Pr.6] Rotation direction setting" and the wiring.
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Machine OPR start
Pr. 44 OPR direction
Near-point dog
Movement range
Pr. 44 OPR direction
Near-point dog
Movement range
OP
Zero signal
OP
Zero signal
Upper limit
Machine OPR start
Upper limit