PLC Tutorials

Tutorials of Programmable Logic Controller – Learn PLC programs and ladder logic lectures of GE, ABB, Siemens, Allen Bradley, Omron PLC’s.

PLC Latched Circuit Example

PLC Latching Function

PLC Latching function is a self-maintaining circuit in that, after being energized, it maintains that state until another input is received.

PLC XOR LOGIC with Ladder Diagram

PLC Logic Functions

In PLC programming, we use different PLC Logic Functions based on basic logic gates like AND, OR, NOT, NAND, NOR, Exclusive OR, Exclusive NOR.

PLC Stop - Start Circuit

Introduction to PLC Ladder Diagrams

A ladder diagram is read from left to right and from top to bottom. When the PLC is in run mode, it goes through the entire ladder program to the end.

4-20mA Current Loop Components

Why Use a Current Loop?

4-20mA current-loop circuit have four individual elements: a sensor/transducer, a voltage-to-current converter, loop power supply and a receiver / monitor.