In this article, you will learn the Schneider PLC programming example for beginners based on input switches and output motors.
Note: The PLC problem statement below is aimed at the freshers and students to understand the ladder logic.
Problem Statement
Design a PLC ladder logic for the following application.
There is a use of four toggle switches to control four motors.
If Switch 1 is ON, then Motor I and Motor II will be ON.
If Switch 2 is ON, then Motor II and Motor III will be ON.
If Switch 3 is ON, then Motor III and Motor IV will be ON.
If Switch 4 is ON, then Motor I and Motor IV will be ON.
Digital Inputs:
The required inputs are listed below.
Digital Outputs:
The required outputs are listed below.
Here in this program, we used EcoStruxure Machine Expert Basic PLC software.
In the above program, we have used Normally Open Contact for Switch 1 (I0.0), Switch 2 (I0.1), Switch 3 (I0.2), and Switch 4 (I0.3)
Switch 1 and Switch 4 are connected in parallel for Motor 1, thus implementing OR logic gate.
For Motor 2, inputs switch 1 and switch 2 are connected in parallel, thus implementing OR logic gate.
Switch 2 and switch 3 are implementing OR logic gate i.e., connected in parallel for Motor 3.
Switch 3 and Switch 4 are connected to Motor 4 in parallel to implement OR logic gate.
For Motor 1 to be ON, either Switch 1 or Switch 4 should be ON.
To turn ON Motor 2, either Switch 1 or Switch 2 should be ON.
When Switch 2 or Switch 3 is ON, then Motor 3 will turn ON.
Motor 4 will turn ON when Switch 3 or Switch 4 is turned ON.
Now we will see the above PLC program result analysis with different input combinations.
When Switch 1 is ON
When toggle switch 1 is turned ON, the signal flows through it. As a result, Motor 1 and Motor 2 get ON.
Other motors will remain OFF because Switch 1 is not connected to them.
When Switch 2 is ON
The signal will flow through switch 2 when it is turned ON that will turn ON Motor 2 and Motor 3. It is so because switch 2 is connected to Motor 2 and Motor 3 only.
When Switch 3 is ON
When Switch 3 is turned ON, the signal flows through it that will turn Motor and Motor 4 ON. The input switch 3 is connected to these outputs only.
Motor 1 and Motor 2 will remain OFF as Switch 3 is not connected to them.
When Switch 4 is ON
Switch 4 will turn ON Motor 1 and Motor 4 when turned ON. Switch 4 is connected to these motors only but on with Motor 2 and Motor 3.
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