What is a PLC?

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 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