Importance

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Abstract

This safety protection device includes: a limitation circuit for performing limitation so that a determination result of a voting circuit does not depend on only outputs of the second determination circuits from outside of the safety protection device, is provided to the voting circuit or at a preceding stage or a subsequent stage of the voting circuit. The voting circuit is imparted with a function of executing a limiting function only when abnormality of a process parameter is detected by a signal from a detector connected to the own device, thereby preventing the function of the own device from being limited or disabled by only a signal from another device.

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First Claim