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Inst Tools > Blog > PLC Tutorials > Ladder Logic Example of Two Motors Interlinked with another Motor

Ladder Logic Example of Two Motors Interlinked with another Motor

In this article, we will learn a ladder logic example of two motors interlinked with another motor in PLC programming.

Last updated: September 28, 2022 4:09 pm
Viral Nagda
PLC Tutorials
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In this article, we will learn a ladder logic example of two motors interlinked with another motor.

Contents
Ladder Logic Example of Two MotorsFirst RungSecond RungThird Rung

In this post, we will study a case of ladder logic. There are two motors – motor A & motor B. And third motor – C is interlinked with both these motors.

There will be a selection for running the two motors of A & B either simultaneously or individually.

If either the motors (A/B) or a single motor is running depending upon the selection, then the third motor will run.

If any single motor is off, then the third motor too will remain off.

Ladder Logic Example of Two Motors

Let us have a look at the ladder logic for the same accordingly.

Ladder Logic Example of Two Motors

Refer to the below image for the logic written. Let us understand each rung one by one.

First Rung

The first rung is used to turn on or off the first motor – A. If both the motors are selected to be running, then this motor will run.

If only a single motor is selected to be running, then depending upon the motor selection, this motor will operate.

In this case, the selection input must be off for turning on the output.

Second Rung

The second rung is used to turn on or off the second motor – B. If both the motors are selected to be running, then this motor will run.

If only a single motor is selected to be running, then depending upon the motor selection, this motor will operate.

In this case, the selection input must be on for turning on the output.

Third Rung

The third rung is used to turn on or off the third motor – C. If both the motors are selected to be running, then this motor will run only when both the previous motors are running.

If only a single motor is selected to be running, then this motor will run if either of the output is running.

In this way, we had a case study of the following example in ladder logic.

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