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|1. (WO2017033319) CONTROL SYSTEM|
The purpose of the present invention is to provide a control system which is capable of avoiding a comparison result mismatch during regular operation. A digital input device (200) of a control system (1) comprises, duplexed in a System A and a System B: a System A input control unit (213) and a System B input control unit (223) which receive input in parallel of a digital signal from a signal source (410) to the System A and the System B, capture digital signal values at least twice at a time interval which is greater than the sum of a digital signal transmission time error and a signal capture time lag of the duplexed System A and System B, and retain the first and second captured digital signal values; and a System A communication control unit (211) and a System B communication control unit (221) which generate communication frames with the first and second captured digital signal values added. The digital input device (200) further comprises a frame comparison unit (230) which treats as a comparison match a situation in which there is a match between the first captured digital signal values and/or the second captured digital signal values of the communication frames which the System A and System B have respectively generated.