US 11,675,023 B2
Control device for industrial machines
Takeru Morishita, Chita-gun (JP)
Assigned to DENSO WAVE INCORPORATED, Aichi-pref. (JP)
Filed by DENSO WAVE INCORPORATED, Chita-gun (JP)
Filed on Jan. 22, 2021, as Appl. No. 17/155,637.
Claims priority of application No. JP2020-009765 (JP), filed on Jan. 24, 2020.
Prior Publication US 2021/0231748 A1, Jul. 29, 2021
Int. Cl. H02H 1/00 (2006.01); G01R 31/52 (2020.01); H02H 9/02 (2006.01); G05B 19/05 (2006.01)
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
OG exemplary drawing
 
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.