Mitsubishi Electric MELSEC-L LD75P User Manual page 519

(4) Control precautions
(a) The following data are set after the OP shift amount is complete.
• OPR complete flag ("[Md.31] Status: b4)
• [Md.20] Current feed value
• [Md.21] Machine feed value
• [Md.26] Axis operation status
OPR request flag ([Md.31] Status: b3) is reset after completion of the OP shift.
(b) "[Pr.53] OP shift amount" is not added to "[Md.34] Movement amount after near-
point dog ON". The movement amount immediately before the OP shift operation,
considering near-point dog ON as "0", is stored. For the stopper method (1) 2) 3)),
the movement amount is not changed from "0".
(c) When using the OP shift function with the stopper method (1) 2) 3)) selected for the
OPR method, configure the OP shift operation in the opposite direction of the OPR
direction. It cannot shift to the OPR direction due to a mechanical stopper in the
OPR direction.
(5) Setting method
To use the "OP shift function", set the required details in the parameters shown in the following table, and write
them to the LD75.
When the parameters are set, the OP shift function will be added to the machine OPR control. The set data is
made valid on the rising edge (OFF to ON) of the PLC READY signal [Y0].
Setting item
[Pr.53] OP shift amount
Speed designation
[Pr.56]
during OP shift
Refer to  Page 118, Section 5.2 for the information on detail settings.
Remark
● Parameters are set for each axis.
● It is recommended that the parameters be set whenever possible with GX Works2. Execution by program uses many
programs and devices. The execution becomes complicated, and the scan times will increase.
Setting
value

Set the shift amount during the OP shift.
Select the speed during the OP shift

0: [Pr.46] OPR speed
1: [Pr.47] Creep speed
CHAPTER 12 CONTROL SUB FUNCTIONS
Setting details
12
Factory-set initial value
0
0
517