PLC Tutorials

PLC Program with 2 Toggle Switches and 4 Motors

This article will teach you the PLC Program with 2 Toggle Switches and 4 Motors logic diagrams.

Note: The logic diagram example is for students and engineering graduates to learn the PLC basics.

PLC Program with 2 Toggle Switches

Problem Statement

Design a PLC ladder logic for the following application.

We are using two toggle switches to control four motors.

If Switch 1 is ON, then Motor I and Motor II will be ON.

If Switch 1 is OFF, then Motor I will be OFF and Motor II will be ON.

If Switch 2 is ON, then Motor III and Motor IV will be ON.

If Switch 2 is OFF, then Motor III will be OFF and Motor I will be ON.

Schneider Electric PLC Example

Watch this PLC video to learn the programming example.

Input Details

Digital Inputs:

This program’s required digital inputs are mentioned below.

Switch 1: I0.0

Switch 2: I0.1

Output Details

Digital Outputs:

This program’s required digital outputs are mentioned below.

Motor 1: Q0.0

Motor 2: Q0.1

Motor 3: Q0.2

Motor 4: Q0.3

2 Toggle Switches and 4 Motors Logic

PLC Program with 2 Toggle Switches and 4 Motors

Logic Diagram Explanation

We used EcoStruxure Machine Expert Basic PLC software for this example logic.

In the above program, we have used Normally Open Contact for Switch 1 (I0.0) and Switch 2 (I0.1).

We have used a Set Coil for Motor 2 (Q0.1), Motor 4 (Q0.3), and a normal Coil for Motor 1 (Q0.0), and Motor 3 (Q0.2).

For Motor 1 and Motor 2 to be ON, switch 1 should be ON

When Switch 1 is turned OFF, Motor 1 will turn OFF but Motor 2 will remain ON as we have used Set Coil for it.

Turning ON Switch 2 will turn ON Motor 3 and Motor 4.

Motor 3 will turn OFF when Switch 2 is turned OFF but Motor 4 for which the Set coil is used remains ON.

PLC Logic Result

Now we will see the PLC logic result with different input scenarios.

When Switch 1 is ON

The signal flows through switch 1 as it is in true state, both Motor 1 and Motor 2 will turn ON.

When Switch 1 is OFF

When switch 1 is turned OFF, Motor 1 will turn OFF and Motor 2 still remains ON as SET coil is used for Motor 2.

When Switch 2 is ON

Motor 3 and Motor 4 will turn ON when switch 2 is turned ON. The input Switch 2 is used as Normally open Contact, in the true state, which will allow the signal to pass through it.

When Switch 2 is OFF

After turning OFF switch 2, Motor 3 will turn OFF and Motor 4 will remain ON in which SET coil is used.

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