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PLC: Programmable Logical Controller
CONTENTS
1. What is PLC
2. Electrical Ladder Logic Diagrams
3. Software Ladder Logic ...
1. PLC - Introduction
What does PLC stand for?
PLC - programmable logic controller
PLC implements logic control functions ...
1. PLC - Introduction
Features

lecture note 9 PLC

3
1. PLC - Introduction
Features

lecture note 9 PLC

4
1. PLC - Introduction
An application example 1: Gate Control

PLC can sense a vehicle at the entrance or exit, and
open an...
1. PLC - Introduction
An application example 2: Conveyor System

PLC can be used to start/stop latching logic for motor
co...
1. PLC - Introduction
Comparing traditional and programmable control systems - 1

lecture note 9 PLC

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1. PLC - Introduction
Comparing traditional and programmable control ystems - 2
In traditional control, the switches S1, S...
1. PLC - Introduction
How does a PLC differ from a computer?
A computer is optimized for calculation and display tasks
A c...
1. PLC - Introduction
Why are PLCs so common?
They are cost-effective
They are flexible, reliable and compact
They have si...
1. PLC - Introduction
Where are PLCs used?
In every industry where automation is involved,
from individual machines to who...
1. PLC - Introduction
What tasks do PLCs perform?
The logic control tasks such as interlocking,
sequencing, timing and cou...
1. PLC - Introduction

Communication
Ports (RS-485)

Outputs & Power Supply

Inputs
lecture note 9 PLC

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1. PLC - Introduction
Structure of a PLC

lecture note 9 PLC

14
1. PLC - Introduction
The PLC processor

lecture note 9 PLC

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1. PLC - Introduction
PLC Input/Output Devices

lecture note 9 PLC

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1. PLC - Introduction
PLC Input Devices
Push buttons
Switches (limit switches, level switches, etc.)
Sensors
...

lecture ...
1. PLC - Introduction
PLC Output Devices
Relay contacts
Solenoid valves
Signal devices (such as lamps, alarms, etc.)
Motor...
1. PLC - Introduction
Programming terminal

lecture note 9 PLC

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1. PLC - Introduction
Programming is done through programming
terminal
Programming terminal translates engineering
languag...
1. PLC - Introduction
Programming through standard computer
Most PLC manufacturers offer software packages
that allow a st...
1. PLC - Introduction
Programming through standard computer

lecture note 9 PLC

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1. PLC - Introduction
Relating the program to inputs and outputs
The CPU reads the data from the inputs
The program in the...
1. PLC - Introduction
Relating the program to inputs and outputs

lecture note 9 PLC

24
1. PLC - Introduction
Data Flow in the PLC

lecture note 9 PLC

25
1. PLC - Introduction
One of the advantages of PLC is that it can be programmed by
non-specialists
Program can be written ...
1. PLC - Introduction
statement list

lecture note 9 PLC

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1. PLC - Introduction
Ladder diagram

lecture note 9 PLC

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Note 8 plc introduction

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INTORDUCTION TO PLC

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Transcript of "Note 8 plc introduction"

  1. 1. PLC: Programmable Logical Controller CONTENTS 1. What is PLC 2. Electrical Ladder Logic Diagrams 3. Software Ladder Logic Diagrams 4. PLC Implementation 5. An example lecture note 9 PLC 1
  2. 2. 1. PLC - Introduction What does PLC stand for? PLC - programmable logic controller PLC implements logic control functions by means of a program lecture note 9 PLC 2
  3. 3. 1. PLC - Introduction Features lecture note 9 PLC 3
  4. 4. 1. PLC - Introduction Features lecture note 9 PLC 4
  5. 5. 1. PLC - Introduction An application example 1: Gate Control PLC can sense a vehicle at the entrance or exit, and open and close the gate automatically The current vehicle count is easily determined by programming a simple counter lecture note 9 PLC 5
  6. 6. 1. PLC - Introduction An application example 2: Conveyor System PLC can be used to start/stop latching logic for motor control Counters can be used for monitoring product amounts lecture note 9 PLC 6
  7. 7. 1. PLC - Introduction Comparing traditional and programmable control systems - 1 lecture note 9 PLC 7
  8. 8. 1. PLC - Introduction Comparing traditional and programmable control ystems - 2 In traditional control, the switches S1, S2 and S3 must close for K1 to be turned on - the wiring makes the rule In PLC systems, the program is written to perform the logic “when S1 is closed AND S2 is closed AND S3 is closed, THEN turn on K1” - the program makes the rule It is much simpler to change program then wiring! lecture note 9 PLC 8
  9. 9. 1. PLC - Introduction How does a PLC differ from a computer? A computer is optimized for calculation and display tasks A computer is programmed by specialists A PLC is designed for (logic) control and regulation tasks A PLC is programmed by non-specialists A PLC is well adapted to industrial environment lecture note 9 PLC 9
  10. 10. 1. PLC - Introduction Why are PLCs so common? They are cost-effective They are flexible, reliable and compact They have significant advantages over traditional control systems based on relay or pneumatics lecture note 9 PLC 10
  11. 11. 1. PLC - Introduction Where are PLCs used? In every industry where automation is involved, from individual machines to whole processes lecture note 9 PLC 11
  12. 12. 1. PLC - Introduction What tasks do PLCs perform? The logic control tasks such as interlocking, sequencing, timing and counting (previously undertaken with relays or pneumatics) In addition, PLCs can perform a variety of calculation, communication and monitoring tasks lecture note 9 PLC 12
  13. 13. 1. PLC - Introduction Communication Ports (RS-485) Outputs & Power Supply Inputs lecture note 9 PLC 13
  14. 14. 1. PLC - Introduction Structure of a PLC lecture note 9 PLC 14
  15. 15. 1. PLC - Introduction The PLC processor lecture note 9 PLC 15
  16. 16. 1. PLC - Introduction PLC Input/Output Devices lecture note 9 PLC 16
  17. 17. 1. PLC - Introduction PLC Input Devices Push buttons Switches (limit switches, level switches, etc.) Sensors ... lecture note 9 PLC 17
  18. 18. 1. PLC - Introduction PLC Output Devices Relay contacts Solenoid valves Signal devices (such as lamps, alarms, etc.) Motors ... lecture note 9 PLC 18
  19. 19. 1. PLC - Introduction Programming terminal lecture note 9 PLC 19
  20. 20. 1. PLC - Introduction Programming is done through programming terminal Programming terminal translates engineering language (logic control) to machine language (binary code) lecture note 9 PLC 20
  21. 21. 1. PLC - Introduction Programming through standard computer Most PLC manufacturers offer software packages that allow a standard computer to be used as a programming terminal lecture note 9 PLC 21
  22. 22. 1. PLC - Introduction Programming through standard computer lecture note 9 PLC 22
  23. 23. 1. PLC - Introduction Relating the program to inputs and outputs The CPU reads the data from the inputs The program in the CPU uses the inputs to evaluate the control logic. As the program runs, the CPU updates the data The CPU writes the data to the output lecture note 9 PLC 23
  24. 24. 1. PLC - Introduction Relating the program to inputs and outputs lecture note 9 PLC 24
  25. 25. 1. PLC - Introduction Data Flow in the PLC lecture note 9 PLC 25
  26. 26. 1. PLC - Introduction One of the advantages of PLC is that it can be programmed by non-specialists Program can be written either in the form of a statement list: a set of mnemonic instructions representing a function of the CPU or a ladder diagram: a graphical language resembling the electrical relay diagrams lecture note 9 PLC 26
  27. 27. 1. PLC - Introduction statement list lecture note 9 PLC 27
  28. 28. 1. PLC - Introduction Ladder diagram lecture note 9 PLC 28
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