CPC G01R 31/52 (2020.01) [H02H 1/0007 (2013.01); H02H 9/02 (2013.01); G05B 19/054 (2013.01); G05B 2219/1105 (2013.01)] | 14 Claims |
8. A control device for industrial machines, comprising:
a plurality of signal input-output circuits each of which is configured to receive an alternating current (AC) signal, convert the AC signal into a pulse signal, and output the pulse signal, the signal input-output circuits further configured such that pulse widths of the pulse signals output from the signal input-output circuits are different from each other, the signal input-output circuits including a first signal input-output circuit;
a processor connected to the signal input-output circuits; and
a memory storing instructions configured to, when executed by the processor, cause the processor to:
determine that the AC signal is input to the first signal input-output circuit when the pulse signal having the pulse width set to the first signal input-output circuit is input to the processor from the first signal input-output circuit; and
detect that a fault has occurred in the control device when the pulse signal having a pulse width different from the pulse width set to the first signal input-output circuit is input to the processor from the first signal input-output circuit.
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