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
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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