| 摘要 |
PURPOSE:To reset to a reference point even when no deceleration limiting switch is prepared, by using the counted value of a counter. CONSTITUTION:A mechanically movable part is positioned at the reference point by jog-feeding by using a job button provided at an operating panel 18, and setting the counted value NA of the counter 16b in an absolute pulse coder 16 at that time as NR, the NR is stored in a battery backup RAM11c incorporating an NC device. Also, at this time, the coordinate value OR of the reference point is set as a current position coordinate value AP (QR AP). Hereafter, NC control is executed, and thereby, the counted value of the counter 16b and the current position coordinate value AP are updated. When a power source is disconnected, and it is applied again afterwards, calculation of [NA-(NR-OR)] is performed, and a result is set as the current position coordinate value AP. And the mechanically movable part is moved at prescribed speed by every shaft in a direction of the reference point by a request to reset to the reference point, and when the current position coordinate value AP goes to QR (AP=OR), it is decided that the movable part arrives at the reference point, then, it is stopped.
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