As shown in figures "A" and "B" of the...

🔍 Key Concepts

• Carefully compare the input signal and the lamp signal in timing diagram B — look at when the lamp turns on and off relative to the input. • Notice how Timer 0 and Timer 1 are wired in the ladder: Timer 1 has a contact in series with the input to Timer 0, and Timer 0’s contact controls both Timer 1 and the lamp. • Think about how an on‑delay timer (TON) behaves when its input goes true, and what happens if that input later goes false.

💭 Think About

• If the input switch is closed only momentarily and then opened, will Timer 0 and Timer 1 be able to complete their timing cycles, based on the ladder diagram? • Does anything in the ladder make the timers or lamp re-trigger by themselves, or do they rely only on the state of the input contact? • From the timing diagram, does the lamp produce just one pulse or repeated pulses while the input is present?

✅ Before You Answer

• Verify whether the input signal stays high for the full duration of both Timer 0 and Timer 1 pulses in the timing diagram. • Check if there is any latching or feedback path that would keep the timers cycling after the input goes low. • Confirm from the lamp trace in timing diagram B whether it shows one flash only or a repeating on‑off pattern.

As shown in figures "A" and "B" of the illustrated PLC ladder and input/output timing diagrams, what statement is true? See illustration EL-0246.

The lamp will flash on then off for one cycle as long as the input contacts are closed.

The lamp will flash on then off for one cycle after a momentary closure of the input contacts, followed by a re-opening of the contacts.

The lamp will continue to flash on and off repeatedly after a momentary closure of the input contacts, followed by a re-opening of the contacts.

The lamp will continue to flash on and off repeatedly as long as the input contacts are closed.

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🔍 Key Concepts

💭 Think About

✅ Before You Answer