If the illustrated SR bistable latch function block PLC ladder diagram represents a subroutine used for a fire alarm system, which statement is true? See illustration EL-0248.

Question

Accepted Answer

Inputs "1", "2", and "3" represent fire/smoke detectors or hand pull reporting stations and Input "4" represents an alarm acknowledgement switch.

Answer

Inputs "1", "2", "3" represent fire/smoke detectors and Input "4" represents a hand pull reporting station.

Answer

Input "4" represents a fire/smoke detector and Inputs "1", "2", "3" represent hand pull reporting stations.

Answer

Inputs "1", "2", and "3" represent alarm acknowledgement station switches stations and Input "4" represents a fire/smoke detector or hand pull reporting station. .

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