Asked by Sewisha Thabo Lehong on Jun 03, 2024
Verified
For the programmed timer circuit shown, the pilot light should come on:
A) as soon as the switch is closed.
B) before the switch is closed.
C) for 15 seconds after the switch is opened.
D) as soon as the switch is closed and for 15 seconds after the switch is opened.
Pilot Light
An indicator light commonly used on control panels and machinery to signal the operational status or alert users to specific conditions.
Switch Closed
A condition where an electrical switch completes a circuit, allowing current to flow.
- Acquire insight into the significance of timers in PLC circuits and their repercussions on outputs.
Verified Answer
EK
elolo komla mawuloloJun 08, 2024
Final Answer :
D
Explanation :
The circuit consists of a normally open switch (S1), a timer (IC1), a relay (K1), and a pilot light (PL1). When the switch is closed, power is supplied to the timer and it starts counting down. After the 1st timing cycle, the relay is energized and the pilot light is turned on. When the switch is opened, the timer is reset and continues to run for another 15 seconds. During this time, the relay remains energized and the pilot light stays on. Therefore, the pilot light comes on as soon as the switch is closed and remains on for 15 seconds after the switch is opened.
Learning Objectives
- Acquire insight into the significance of timers in PLC circuits and their repercussions on outputs.
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