Question 287Electricity & Electronics - Assistant Engineer

70% to pass

Assuming the ladder diagram of figure "1" and the corresponding input/output diagram of figure "2" represents a simple PLC motor controller, what statement is true? Illustration EL-0232

Diagram for USCG Electrical Assistant: Assuming the ladder diagram of figure "1" and the corresponding input/output...
AThe input switch is a momentary contact start button, output "A" is the motor contactor coil, and output "B" is a motor run status lamp for the running condition.
BThe input switch is a momentary contact start button, output "A" is the motor contactor coil, and output "B" is a motor run status lamp for the stopped condition.
CThe input switch is a maintained contact on-off selector switch, output "A" is the motor contactor coil, and output "B" is a motor run status lamp for the running condition.
DThe input switch is a maintained contact on-off selector switch, output "A" is the motor contactor coil, and output "B" is a motor run status lamp for the stopped condition.
AI Explanation

The correct answer is C. The input switch is a maintained contact on-off selector switch, which means it can be left in either the on or off position. Output "A" is the motor contactor coil, which controls the starting and stopping of the motor. Output "B" is a motor run status lamp that indicates the running condition of the motor. The other options are incorrect because: A) The input switch is not a momentary contact start button, and output "B" is not a lamp for the stopped condition. B) The input switch is not a momentary contact start button, and output "B" is not a lamp for the stopped condition. D) The input switch is not a maintained contact on-off selector switch, and output "B" is not a lamp for the stopped condition.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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