Design a PLC ladder logic for the following application.
We are using three toggle Switches to control three LED’s
The required inputs are listed below.
Toggle Switch 1: I0.0
Toggle Switch 2: I0.1
Toggle Switch 2: I0.1
Here we call these toogle switches as simple “Switch” in our next discussions, But remember these are toggle-type switches.
The required outputs are listed below.
LED 1: Q0.0
LED 2: Q0.1
LED 3: Q0.2
In Rung0, the signal through Switch 1 and Switch 2 when turned ON.
As a result, LED 1 and LED 3 will turn ON. Switch 3 is used as a Normally Closed Contact for Switch 3 when in a false state, it will allow the signal to turn ON LED 2.
The signal through Switch 2 and Switch 3 in Rung1, that turns ON LED 3.
In Rung0, switch 3 is taken as Normally Closed Contact, when in the true state, it will not allow signal to pass through it. As a result, LED 2 will turn OFF. Switch 3 is connected to LED 1 and therefore, it will remain ON.
You can also watch the tutorial video below for this LED control PLC example program.
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