Basics of a PLC, how PLC work, PLC course part 2

Welcome to the PLC course, in this video, we will learn the basics of PLC.
Full-Form of PLC is a Programmable Logic controller.
It is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.
PLCs were first developed in the automobile manufacturing industry to provide flexible, rugged, and easily programmable controllers to replace hard-wired relay logic systems. Since then, they have been widely adopted as high-reliability automation controllers suitable for harsh environments.
A PLC basically consists of solid-state Hardware and Software. The hardware can control the process according to the program stored in it. Users can store instruction in the PLC's memory in the form of Software, which is called a program. And users can change or edit the Program at any time. That's why it is called a Programmable Logic Controller.
PLC is a replacement of a huge panel consisting of many relays, timers, counters, etc.
PLC's hardware consists of 4 Major parts.
1. Input Module
2. Output Module
3. CPU and Memory
4. Power Supply.
Input and output models are optically isolated from the CPU. This isolation provides Safety to the CPU. The input module is connected with switches, sensors, transducer, and other Input devices. It receives input from input devices and sends this input to the CPU.
CPU reads this input and compares it to the program saved in its memory and gives the output signal to the output module after logical decisions.
And output module is connected to the output devices like motors, actuators, indicators, etc.
Power Supply Provide Power to the Input Module, Output Module, and CPU.
and we need a programing device also, to Write a program and transfer it to the CPU memory. A simple Personal computer or laptop can perform this action.
The 5 most popular types of PLC Programming Languages are:
1. Ladder Diagram (LD)
2. Sequential Function Charts (SFC)
3. Function Block Diagram (FBD)
4. Structured Text (ST)
5. Instruction List (IL)


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