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PLC Programming
13 questions
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Question 1 of 13
In this machine center, all real-world inputs are N.O. proximity sensors arranged along a conveyor line.
Describe all combinations of inputs that would allow the output to energize.
Reveal answerThis is a simple answer: the input must be energized (in other words, an object is detected in front of the sensor) for the output to become energized.
Notes:In all exercises, the sensors are assumed to be either inductive, capacitive, or light-on optical proximity switches, with either NPN or PNP wiring. Each problem will specify whether they are normally open (N.O.) or normally closed (N.C.) contacts.
Remember this important difference between logic and circuits. Any real-world device, whether N.O. or N.C. can be programmed in the PLC to energize an output. Do not worry about whether the real-world device is N.C. or N.O., but rather, try to identify the conditions that will allow current to flow through the device or not, which will influence its behavior in the logic.
To review the differences between normally open and closed, check out our educational article before proceeding.
Reference educational articles:
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Question 2 of 13
In this machine center, all real-world inputs are N.C. proximity sensors arranged along a conveyor line.
Describe all combinations of inputs that would allow the output to energize.
Reveal answerThe input must be de-energized (no object detected; the area in front of the sensor is clear) for the output to become energized.
Notes:Reference article: normally open vs. normally closed contacts
Other reference educational links:
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Question 3 of 13
In this machine center, all real-world inputs are N.O. proximity sensors arranged along a conveyor line.
Describe all combinations of inputs that would allow the output to energize.
Reveal answerThe input must be de-energized (no object detected) for the output to become energized.
Notes:Reference article: normally open vs. normally closed contacts
Other reference educational links:
