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What is a PLC?

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China

What is a PLC?

PLC Definition

A programmable logic controller is a specialized computer designed to operate in industrial settings, managing and automating the mechanical processes of factories and plants.

Working principle of PLC

plc结构.png

PLC components

Rack or chassis
Power Supply Module
Central Processing Unit (CPU)
Input & Output Module
Communication Interface Module

Functionality

PLCs handle tasks like timing and logic operations, significantly streamlining industrial processes.

Programming Flexibility

The programming of a PLC can be altered to meet changing operational needs, enhancing adaptability in industrial environments,the included programming languages include：

Textual Language

Instruction list
Structured text

Graphical Form

Ladder Diagrams (LD) (i.e. Ladder Logic)

Function Block Diagram (FBD)

Sequential Function Chart (SFC)

Types of PLCs

Compact PLC
Modular PLC

PLC Applications

Process Automation Plants (e.g. mining, oil &gas)
Glass Industry
Paper Industry
Cement Manufacturing
In boilers – Thermal Power Plants

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PLC

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