for eduction

1. SEMINAR
ON
“PLC”
(Programmable Logic Controller)
SUBMITTED TO SUBMITTED BY
SAURABH SHUKLA
B.TECH (EE)
3rd YEAR
Mr.ASHISH CHAUDHARY

2. CONTENTS
What is PLC?
History of PLC
Major components of PLC
Operational sequence of PLC
Ladder logic
Example of starting and stopping of a motor
Advantage
Disadvantage
Application

3. What is PLC?
 PLC is a digital computer designed for multiple Input and Output.
 It is an example of a real time system.
Fig:1 Structure of PLC[1]

4. History of PLC
 PLC was introduced in 1960.
 DICK MORLEY was father of PLC.
 First successful PLC was designed and
developed by MODICON.
(Modicon=Modular Digital
Controller)
 It is a machine with thousands of
electronic parts.

5. Major components of a common PLC
Fig:2 Components of PLC [2]

6. Operational sequence of PLC
Fig:3 Operation of PLC [3]

7. Programming Example:
Ladder Logic Program for Start/Stop of Motor
Fig:4 Ladder Logic example of PLC [4]

8. Fig:5 Example of Start/Stop Motor [5]

9. ADVANTAGE OF PLCs:
Cost effective for controlling complex system.
Small physical size, shorter project time.
High speed of operation.
Easy of maintenance.
Reduced space.
Energy saving.

10. DISADVANTAGES OF PLCs:
Limited design and cost option.
Fixed circuit operations.
PLCs manufacturers offer only close
architectures.

11. APPLICATION OF PLCs:
Robots manufacturing.
Car park control.
Train control station system.
Traffic light.
Operation of machine tools.
Conveyer system, etc.

12. Reference
[1].https://www.ibiblio.org/kuphaldt/electricCircuit
s/Digital/04334.png
[2]/https://jeremyzhangchao.files.wordpress.com/2
014/03/111111.png
[3]. https://www.techtransfer.com/wp-
content/uploads/PLCScan1.jpg
[4].http://cdn2.bigcommerce.com/server4800/h9h
e6/product_images/uploaded_images/startstopc.p
ng?t=1418566532
[5].http://sub.allaboutcircuits.com/images/04338.p
ng

13. Thank You!!!