SAFETY PROTECTION DEVICE

WIPO Patent Application WO/2023/100275

A1

This safety protection device comprises: a plurality of first determination circuits (211, 212) that are connected to a plurality of detectors (101, 102, 103, 104) respectively, receive input of detection values from the detectors, and output operation request signals if the detection values are equal to or larger than a predetermined threshold value; and a majority vote circuit that receives input of the outputs of the plurality of first determination circuits, receives input of the outputs of a plurality of second determination circuits (311, 312) from outside of the safety protection device, and confirms majority vote if the total number of outputs of the operation request signals is half the total number of the input outputs of the first and second determination circuits or more, and is characterized by comprising a limiting circuit that puts a limitation such that the result of determination by the majority vote circuit does not depend only on the outputs of the second determination circuits, the limiting circuit being provided upstream of, downstream of, or in the majority vote circuit. The majority vote circuit is provided with a function for executing the limiting function only when a process parameter is detected to be abnormal on the basis of the signals from the detectors connected to the safety protection device. This configuration prevents the function of the safety protection device from being limited or disabled only by the signals from other devices.

OKUDA SUSUMU (JP)

PCT/JP2021/044019

June 08, 2023

December 01, 2021

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MITSUBISHI ELECTRIC CORP (JP)

G05B23/02; G05B9/03; G06F11/07

JP2012079184A	2012-04-19
US20110313580A1	2011-12-22
US20160284429A1	2016-09-29

PALMO PATENT FIRM, P.C. (JP)

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