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Logic gates, Boolean equation and equivlent ladder diagram


Boolean algebra was developed in the 1800’s by James Bool, an Irish mathematician. It was found to be extremely useful for designing digital circuits, and it is still heavily used by electrical engineers and computer scientists. The techniques can model a logical system with a single equation. The equation can then be simplified and/or manipulated into new forms. The same techniques developed for circuit designers adapt very well to ladder logic programming.

AND Gate
The AND gate requires two inputs and has one output. If here 0 is called false and 1 is called true the gate acts in the same way as the logical and operator. The output is true when both inputs are true. Otherwise, the output is false.
Logic Diagram
Truth Table
Ladder Diagram
Boolean Equation


A=B.C

OR Gate
The output will be true if any of the input is true.
Logic Diagram
Truth Table
 Ladder Diagram
Boolean Equation

C=A+B

NOR Gate
NOR gates out put are invert of OR gate. If both inputs are false then output will be true.
Logic Diagram


Truth Table


Ladder Diagram
Boolean Equation
 



NAND Gate
NAND gates output are invert of AND gate. If both inputs are true then output will be true.
Logic Diagram


Truth Table


 Ladder Diagram
Boolean Equation






XOR Gate
If only one input is true then the output will be true.
Logic Diagram


Truth Table


Ladder Diagram
Boolean Equation





NOT Gate

The input and output is total opposite. If input is true output will be false, if input false output will be true. 
 Logic Diagram


Truth Table

 Ladder Diagram
Boolean Equation





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