As shown in figure "A" of the illustrated...

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Question 1 of 205eccefa5bacbc34ba4d48855

As shown in figure "A" of the illustrated PLC output unit, what switching technology is used to control the output load either being energized or de-energized as appropriate? See illustration EL-0229.

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🔍 Key Concepts

• Figure A shows an AC load (120 VAC) controlled by a semiconductor device that conducts in both directions. • Compare the schematic symbol in A with the standard symbols for triac, diac, bipolar junction transistor, and a relay-based solid-state module. • Think about which device is commonly used in PLC output modules to switch AC loads without mechanical contacts.

💭 Think About

• Look closely at the symbol: how many terminals are clearly implied, and does the symbol show bidirectional conduction or a mechanical contact? • Which of the listed components is specifically designed to control AC power to a load and can be triggered by a low‑level control signal from a processor? • Would a bipolar junction transistor normally be used directly on 120 VAC, or is it more common in DC, low‑voltage circuits?

✅ Before You Answer

• Match the exact symbol shape in the illustration with the standard electronic symbols for triac/diac/transistor/relay in your reference materials. • Confirm which of the listed devices is designed for bidirectional AC switching rather than DC-only or low-level triggering. • Verify which device type is typically used in PLCs when the output label specifies 120 VAC load with no mechanical contacts shown.

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