| 摘要 |
PURPOSE:To obtain a command position in response to the machine position set in an application of power supply by correcting the machine position by a correction pulse when the correction is needed and defining the command position set when the coincidence is secured between the count value of a counter of an absolute pulse coder and that of another counter as a command position set in response to the machine position of the application mode of power supply. CONSTITUTION:The count value CRA of a counter 16b obtained when a reference point is reset is previously stored in a battery back-up RAM 11c. A path control means 11a of an NC device 11 performs the tentative interpolation control based on the difference between the count value CA of the counter 16b and the value CRA stored in the RAM 11c to replace a command position CP from zero and also the machine position from the value CRA after a power supply is applied. A machine position correcting means 11b corrects the machine position in parallel with said tentative interpolation control, Then the means 11a corrects the machine position as necessary. Hereafter the tentative interpolation processing and the correction processing are continued until CRA=CA is satisfied. Then the position CP is defined as the machine position at the time of power application when CRA=CA is satisfied.
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