Boolean Logic Control Programs in PLC

Boolean logic control ladder programs examine and control on and off states.

Boolean here is used interchangeably with the word “discrete”

Each control program (ladder diagram sequence) can contain one or more conditionals


– If (a part is on the conveyor) AND (there is not a box in the chute) THEN (turn the conveyor motor on)

In terms of sensors and actuators this becomes

– If (sensor_A is ON) AND (sensor_B is NOT ON) THEN (turn actuator_C ON)

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