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Ladder Logic programming language is the leading popular programming language for PLC programming. It is a very intuitive graphical programming language, easy to learn, easy to program and bug fixes.

 

The Ladder Logic programming language is very similar to electrical relay circuits. So if you know the relay control circuit, you will learn to program the Ladder Logic quickly and easily.

The purpose of the PLC was to directly replace electromechanical relays as logical elements, and instead replace a solid-state digital computer with stored software, capable of simulating the interconnection of many relays to perform certain logical tasks.
The PLC has several "input" terminals, through which it interprets the "high" and "low" logic states and analog values ​​from switches and sensors.
It also has several output terminals, through which outputs “high” and “low” signals for power lamps, solenoids, contactors, micro-actuators, and other devices that allow on/off control and also the analog output to control the control valves and actuator control in speed etc .

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