What power supply is connected to the normally open push buttons on the workstation?

Study for the Programmable Logic Controller (PLC) Test. Prepare with flashcards and multiple choice questions, each question provides hints and explanations. Get ready for your exam!

Multiple Choice

What power supply is connected to the normally open push buttons on the workstation?

Explanation:
The signal from a normally open push button is just a closed contact feeding the control circuit when pressed. The important point is that the control voltage feeding that circuit is the low‑voltage supply in the panel, not the main line power. In this workstation, the control circuit is designed around 24 volts alternating current. That means when the button is pressed, the 24 VAC supply is connected through the button to the input/relay path, signaling the PLC or control logic. This low, safe voltage is common for control wiring because it provides enough signal level for the logic without the hazards and insulation requirements of higher line voltages. Other voltages shown—like 120 VAC or 12 VAC—or a DC version would be used in different designs, but this particular layout uses 24 VAC for the push-button control circuit.

The signal from a normally open push button is just a closed contact feeding the control circuit when pressed. The important point is that the control voltage feeding that circuit is the low‑voltage supply in the panel, not the main line power. In this workstation, the control circuit is designed around 24 volts alternating current. That means when the button is pressed, the 24 VAC supply is connected through the button to the input/relay path, signaling the PLC or control logic. This low, safe voltage is common for control wiring because it provides enough signal level for the logic without the hazards and insulation requirements of higher line voltages. Other voltages shown—like 120 VAC or 12 VAC—or a DC version would be used in different designs, but this particular layout uses 24 VAC for the push-button control circuit.

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