This document provides an overview of PLC and SCADA systems. It defines PLC as an industrial computer that monitors inputs, makes decisions based on its program, and controls outputs to automate processes. The history and components of PLCs are described, including the power supply, I/O modules, processor, and programming devices. Programming languages for PLCs include ladder logic, functional block diagrams, and sequential function charts. SCADA is defined as software used for process control that allows users to monitor, control, generate alarms and acquire data from remote facilities. The document discusses the composition, advantages, and applications of SCADA systems.

1. SEMINAR ON
PLC AND SCADA SYSTEM
SUBMITTED BY :
VIKAS KUMAR
ELECTRONICS AND INSTRUMENTATION
1605232056
3rd YEAR (5TH SEMESTER)
SEMINAR GUIDE :
MR. SUBODH WAIRYA

2. Contents
Abstract
What is PLC?
History of PLC
Block diagram of PLC
Operational sequence of PLC
Ladder logic
Example of starting and stopping of a motor
SCADA
What is the purpose of SCADA
Composition of SCADA system
Advantages
Disadvantages
Application
Conclusion

3. ABSTRACT
 Normally open and closed contacts.
 Relays and their relationship to ladder logic.
 PLC outputs can be inputs, as shown by the seal in
circuit.
 Programming can be done with ladder logic, mnemonics,
SFCs, and structured text.
 There are multiple ways to write a PLC program.

4. What is PLC?
PLC is an industrial computer that
monitors input, makes decisions based
on its program and controls outputs to
automate a process or machine .
PLC = Hardware + Software.
PLC is a switching device .

5. History of plc
 PLC was introduced in late 1960’s
 First commercial & successful Programmable Logic
Controllers was designed and developed by Modicon as a
relay replacer for General Motors.
 Earlier, it was a machine with thousands of electronic
parts.

6. POWER SUPPLY
I M
N O
P D
U U
T L
E
O M
U O
T D
P U
U L
T E
PROGRAMMING
DEVICE
PROCESSOR
FROM
SENSSORS
TO
OUTPUT

7. Major Components of a Common PLC
POWER SUPPLY
 Provides the voltage needed to run the primary PLC
components
I/O MODULES
 Accepts and converts signals from sensors into a logic
signal . Ex. : Switches , Pushbuttons.

8. PROGRAMMING DEVICES
 The programming terminal is used for programming the
PLC and monitoring/sequencing PLCs operation .
OUTPUT DEVICES
 EX. : Motors, Lamps , Alarms etc .

9. Programming Languages of PLC
 Most common languages encountered in PLC programming
are:
 1) Ladder Logic
 2) Functional Block Diagram
 3) Sequential Function Chart
 4) Boolean mnemonics

10. LADDER LOGIC


11. DOWNLOAD
UPLOAD
DATA TRANSMISSION : Serial
BAUD RATE : 9.6 Kbps to 19.2 Kbps
DRIVER SOFTWARES : RS Linx Classic , RS 232
PROGRAMMING SOFTWARE : RS Logix 500

12. PROGRAMMING BASICS

13. TIMERS:
There are following timers:
 TON Timer
 TOFF Timer
 RTO Timer
TON TIMER:
I/P
EN
TT
DN

14. COUNTERS
There are following counters present :
 Up Counter (CUP)
 Down Counter (CDOWN)

15. PROGRAMMING EXAMPLE :
 Ladder logic program for start/stop a motor

17. SCADA
is a kind of software application
program used for the process control.
SCADA stands for:
 Supervisory
 Control
 And
 Data
 Acquisition

18. What is the purpose of SCADA
The primary purpose of SCADA is:
 to monitor
 to control
 Alarming functions
 Data presentation
 Data acquisition

19. COMPOSITION
 Input/output signal hardware
 Network

20.  Human Machine Interface (HMI)
 Controllers

21.  Database

22. ADVANTAGES OF PLC
 Very fast
 Easy to change logic i.e. flexibility
 Reliable due to absence of moving parts
 Low power consumption
 Easy maintenance
 Facilities in fault finding and diagnostic
 Capable of handling of very complicated logic operations
 Ease operator interface
DISADVANTAGE OF PLC
 Initial costs are high
 Unemployment rate increases

23. ADVANTAGES OF SCADA
 Reduce time consumption
 Reduce human resource consumption
 Increase product/project revenue
 Greater accessibility (remotely)
 More security (implementation of user access
levels)
 Instantaneous alert on alarms or events
 Organized data records and report generation
automatically
 Data analysis (real-time and historical data
plotting of graphs, charts, trends, etc.)
 Automated calculation

24. APPLICATION OF SACADA SYSTEM
 Water and sewage treatment plants and supply
management
 Traffic controls
 Lift and Elevator controls
 Manufacturing Industries or plants
 Electric power system, operation and control
 Automatic car washing system

25. CONCLUSION
 With the development of a PLC and SCADA system ,it will
significantly reduce the labor cost and improves the
performance of plant in manufacturing industry.
 It has the capability of displaying the trends. Where
information gathered is displayed graphically , the system
shows the developing problems and help the management
in taking the corrective measures.

26. THANK YOU