Programmable Logic Controller (PLC) is a digital computer used for the automation of various electro-mechanical processes in industries. These controllers are specially designed to survive in harsh situations and shielded from heat, cold, dust, and moisture etc. PLC consists of a microprocessor which is programmed using the computer language.


The program is written on a computer and is downloaded to the PLC via cable. These loaded programs are stored in non – volatile memory of the PLC. During the transition of relay control panels to PLC, the hard wired relay logic was exchanged for the program fed by the user. A visual programming language known as the Ladder Logic was created to program the PLC. Programmable Logic Controllers were discovered by the automotive industry to substitute the re-wiring of the machine’s control panel.

Prior to the invention of PLC, automobiles were manufactured using plenty of relays, cam timers, and closed loop controllers. The electricians had to re-wire every part of the machine daily which was time consuming and highly expensive on the financial front.


Not Required 

Course Content

Module 1 : Definition and History of PLC

  • Module 2 : PLC Architecture

  • Module 3 : PLC Control & Actuation

  • Module 4 : OLD Diagram

  • Module 5 : Hardware components require in PLC

  • Switches (Theory with assignments)

  • Relay (Theory with assignments)

  • Contactor(Theory with assignments)

  • Timer(Theory with assignments)

  • Sensor(Theory with assignments)

  • Module 6 : Basic PLC Programming

  • NO NC

  • SPDT

  • Latching 

  • Memory Bit

  • Comparator


  • Timer

  • Module 7 : Hardware Practical

  •  Module 8 : Communication and Interfacing between PLC to PC
  • Module 9 : Project 
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