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公开(公告)号：US11408560B2
公开(公告)日：2022-08-09
申请号：US17066491
申请日：2020-10-09
Applicant: Keyence Corporation
Inventor： Ryuma Miyake , Yuta Kato
Abstract: Recording a history related to an operation of a safety program contributes to a determination of a cause of a false OFF signal. A safety controller acquires, from at least one safety input device or safety sensor, extra information that is not used for obtaining an output signal and records an input signal and an output signal together with the extra information as history information at predetermined recording intervals.
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