This document discusses programmable logic controllers (PLCs). It defines a PLC as a digital computer used for automating industrial processes. PLCs were developed to replace hardwired control panels as they are solid-state, can easily modify inputs/outputs, and can be programmed by plant electricians. The document lists advantages of PLCs like handling complex systems, reduced wiring, increased reliability, flexibility, lower cost, and communication capabilities. It also provides examples of PLC applications in various industries like travel, textiles, aerospace, printing, and manufacturing.

1. BY:
D RAJKUMAR
12P75A0204

2. CONTENTS
 What is PLC?
 Why we use PLC’s
 How plc’s are help in ELECTRICAL SYSTEM
 Working of plcs
 Advantages and Disadvantages
 Applications

3. INTRODUCTION
WHAT IS PLC ?
 A programmable logic
controller, PLC or programmable controller is a digital
computer used for automation of typically industrial
electromechanical processes, such as control of
machinery on factory assembly lines, amusement rides,
or lighting fixtures.
 PLCs are designed for multiple analogue and digital
inputs and output arrangements, extended temperature
ranges, immunity to electrical noise, and resistance to
vibration and impact.

4. NEED FOR PLC:
 Hardwired panels were very time consuming to
time, debug and change.
 The following requirements for computer controllers to
replace hardwired panels.
1.Solid-state not mechanical.
2.Easy to modify input and output devices.
3.Easily programmed and maintained by plant
electricians.
4.Be able to function in an industrial environment.

5. SSSSSSSSS

10. PLC ADVANTAGES
• Handles much more complicated
systems.
• Less and simple wiring.
• Increased Reliability.
• More Flexibility.
• Lower Cost .
• Faster Response.
• Easier to troubleshoot.
• Remote control capability.
• Communication Capability.

11. DISADVANTAGES

12. APPLICATIONS OF PLC
TRAVEL INDUSTRY
TEXTTILE INDUSTRY
AEROSPACE
PRINTING INDUSTRY
MANUFACTURING
MACHINING

15. PLC CONTROL PANNEL

17. PLC RELAY