| 摘要 |
PCT No. PCT/JP89/00150 Sec. 371 Date Oct. 18, 1989 Sec. 102(e) Date Oct. 18, 1989 PCT Filed Feb. 15, 1989 PCT Pub. No. WO89/08287 PCT Pub. Date Sep. 8, 1989.A reference-point return method for a numerical control system. When a return is made to a reference point, a numerical control unit (21) reads an absolute position of a motor (23) within one revolution thereof from an absolute position detector (24), obtains a distance B from a predetermined motor point (a grid point) to the absolute position that has been read, and initially sets the distance B as a command position REFn from the grid point. Thereafter, the numerical control unit (21) outputs a move command value DELTA Rn to a digital servo-circuit (22) every predetermined time DELTA T, updates a commanded position REFn in accordance with the equation REFn+ DELTA Rn->REFn obtains REFn after a deceleration limit switch (25) is depressed, and outputs (N-REFn) to the digital servo-circuit (22) as a final commanded traveling distance DELTA Rn to return the movable element to a reference-point position set at a predetermined grid point.
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