What are the logic behind 2x2 and 2x3 logic and more when ask in interviews

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What are the logic behind 2x2 and 2x3 logic and more when ask in interviews..

Answer / mnb

these logics are mainly seen in f&g system where signals from 2 sensors out of 3(2 out of 3) reaches preset value the system should shutdown or should do the actions programmed.
this can be used with any transmitters. Its main aim is to avoid unwanted shutdown.

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