Mitsubishi Electric MELSEC-LD77MS2 User Manual page 755

[2] OPR
In the absolute position system, an OP can be determined through OPR.
In the "Data set method" OPR method, the location to which the location of the
OP is moved by manual operation (JOG operation/manual pulse generator
operation) is treated as the OP.
[LD77MS4 operation example]
Cd.3 Positioning
start No.
Positioning start
[Y10 to Y13]
(Note): Refer to Section 3.3 for input/output signal of LD77MS16.
Fig. 13.34 Operation of the OPR execution
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Chapter 13 Control Sub Functions
Movement range for the machine
Moved to this position by
manual operation.
The stop position during
OPR execution is stored as the OPR position.
9001 (OPR destination)