This article teaches how to convert Boolean logic to PLC programming ladder logic with the video tutorial.
Note: The logic diagram example shown here is for educational use only for engineering students to understand PLC principles.
Boolean Logic to PLC
Problem Statement
Design a PLC ladder logic for the following Boolean Expression.
We are using toggle Inputs to control the output.
Convert the boolean logic to PLC logic.
Y = A’B
Video
The below video explains the boolean logic conversion with detailed steps.
Inputs
The required inputs mentioned below.
A: I0.0
B: I0.1
Outputs
The required outputs mentioned below.
Y: Q0.0
PLC Programming
The equivalent PLC programming is shown below.
Program Description
- We used Schneider PLC programming software.
- In the above program, we have used Normally Closed Contact for Input A and Normally Open Contact for Input B.
- Normally Closed Contact is used for Input A, thus implementing NOT Logic Gate.
- For the output Y (Q0.0) to be ON, Input A should be OFF and Input B should be ON.
- Input A will only pass the signal when it is in a false state.
- Turning ON Input A will turn OFF Y(Q0.0) because Normally Closed Contact in the true state does not allow the signal to pass through it.
Result
When Input A is OFF and Input B is ON
The signal will pass through Input A as Normally Closed Contact will pass the signal through it when in a false state. Also, Input B will pass the signal when in the true state because it is in Normally Open Contact, and Y(Q0.0) will turn ON.
When the input A is turned ON, as it is Normally Closed Contact, it will not allow the signal to pass. The state of Input B will not matter as the signal will not reach there when the input A is ON.
As a result, the output Y (Q0.0) will not turn ON. So, for the output Y (Q0.0) to be ON. The Input A should be OFF and the Input B should be ON.
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