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Consider the following tree diagram: Which of the following nodes are parent nodes?
Through-beam Sensor
A type of photoelectric sensor where the emitter and receiver are positioned opposite each other, detecting objects when the beam is interrupted.
Sensing Range
The distance within which a sensor can detect the presence of an object or a signal.
NC Pushbutton
A Normally Closed pushbutton switch that makes contact (closes) when at rest and breaks the circuit when pressed.
Ladder Logic
A programming language that represents electronic switching circuits; widely used in programming PLCs.
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