| 摘要 |
PURPOSE:To prevent an accident attending on the operation of stopping clocks, by equipping a unit, which operates synchronizing with clock pulses, with FF performing inversion by clock pulses, a delay circuit, exclusive logic sum circuit, and supervisory circuit composed of LPF. CONSTITUTION:In the numerical controller, clock pulse (a) obtained from the output pulse of oscillator 1 by waveform-shaping 2 is divided by FF7 and division signal (b) and signal (c) obtained from signal (b) through approximately 180 deg. delay 9 are inputted to exclusive logic sum circuit 8. Output signal (d) of circuit 8 has its high-frequency component removed by LPF10 to obtaine signal (e). As a result, when pulse (a) under a constant supervision stops, alarm generating circuit 11 is operated to send out an alarm and also to turn servo system 4 OFF, thereby stopping work machine 5. The stop of clock pulses is therefore detected automatically and an accident caused by stopping pulses can be prevented. |
