This document summarizes a seminar presentation about programmable logic controllers (PLCs). It introduces PLCs, describing their history and role in industrial automation. The presentation discusses the physical structure of PLCs, including their rack or chassis, power supply module, central processing unit, input/output modules, and communication interfaces. It also outlines the main types of PLCs and provides examples of their applications in water filling, manufacturing machinery, and other industrial processes. Finally, the document compares PLCs to SCADA systems.

1. MAHATMA JYOTIBA PHULE ROHILKHAND
UNIVERSITY
BAREILLY
DEPARTMENT
OF
ELECTRONICS & INSTRUMENTATION ENGINEERING
SEMINAR PRESENTATION
ON
PLCs
PRESENTED BY:-
UTTAM KR. YADAV
20EI43
PRESENTED TO:-
MUKUL GUPTA

2. CONTENTS
 Introduction to PLC
 About PLC
 Physical structure of PLC
 Types of PLC
 Its Application
PLC Programming

3. INTRODUCTION
PLCs were invented by Dick Morley in 1964.
 It is a specialized industrial computer used in manufacturing
and automation processes to control machinery and processes.
It plays a crucial role in a wide range of industries, including
manufacturing, automotive, energy, and many others.
PLCs are designed to perform specific tasks, monitor inputs,
make decisions based on programmed logic, and control outputs
to automate processes and machinery.

4. AUTOMATION
INDUSTRIAL
(PLC,SCADA,HMI,
VFD,RTO,DCS)
NON- INDUSTRIAL
(SECURITY PURPOSE)
USE
Water filling , titanic , robotics
Machine , printing machine , Panels
(HT,LT,PLC)
Uses

5. ABOUT PLC
• Input Devices
• Components
• Programmability
• Logic and control
• Output control
• communications
• Maintenance and troubleshooting

6. BLOCK DIAGRAM OF PLC

7. PHYSICAL STRUCTURE OF PLC
The structure of a PLC is almost similar to a computer’s
architecture.
It continuously monitors the input values from various input
sensing devices (e.g. accelerometer, weight scale, hardwired
signals, etc.)
It produces corresponding output depending on the nature of
production and industry

8. PARTS OF PLC
Rack or chassis
Power Supply Module
Central Processing Unit (CPU)
Input & Output Module
Communication Interface Module

9. TYPES OF PLC
 Compact PLC
Within a single case, there would be many modules. It has a fixed
number of I/O modules and external I/O cards. So, it does not have
the capability to expand the modules. Every input and output
would be decided by the manufacturer.
 Modular PLC
This type of PLC permits multiple expansion through “modules”,
hence referred to as Modular PLC. I/O components can be
increased. It is easier to use because each component is
independent of each other.
• PLC are divided into three types based on output namely Relay
output, Transistor output, and Triac Output PLC
• According to the physical size, a PLC is divided into Mini,
Micro, and Nano PLC.

10. APPLICATIONS OF PLC
1.Process Automation Plants (e.g. mining, oil &gas)
2.Glass Industry
3.Paper Industry
4.Cement Manufacturing
5.In boilers – Thermal Power Plants

11. PLC VS SCADA

12. THANK YOU