Mitsubishi Electronics QD75P, QD75D user manual OPR Method, This point is the reference

APPENDICES

MELSEC-Q

OP OPR METHOD

This is the reference position for positioning. Positioning cannot start without a reference point.

The OP is normally set to the upper or lower stroke limit.

This point is the reference.

The OPR methods are shown below. The method used depends on the machine structure, stopping accuracy, etc.

OPR can be carried out when the OPR parameters are written.

1)Near-point dog method

2)Stopper method

3)Count method

OP

OP SHIFT FUNCTION

The OP position can be shifted in the positive or negative direction by executing a machine OPR and determining the shift amount from the machine OPR complete position.

An OP can be set at a position besides the OP position, or outside the dog switch.

OPERATION PATTERN

The kind of operation to be carried out after executing the positioning data is determined.

1)If "POSITIONING COMPLETE" is selected, the operation will stop after the positioning is complete.

2)If "CONTINUOUS POSITIONING CONTROL" is selected, the next data No. will be automatically executed after the positioning is complete.

3)If "CONTINUOUS PATH CONTROL" is selected, the positioning will not be completed. Only the speed will be automatically changed, and the next data No. will be executed.

OPR PARAMETER

This parameter is required when returning to the OP. It is determined by the machine side design, so subsequent changes of this parameter must be accompanied by changes in the machine design.

The OP is the reference for positioning operations, so if the OP is lost due to a power failure during positioning, or because the power is turned OFF and the machine is moved manually, etc., it can be restored by carrying out an OPR. When a machine OPR command is issued, the machine will move in search of the near-point dog regardless of the current value, and will stop at the OP. At this time, the current value will be rewritten to the OP address. Data cannot be written during positioning. With the QD75, data is always written for all axes (from 1 to 4 axes).

Refer to the term "NEAR-POINT DOG".

Appendix - 82