PLC (Programmable Logic Controller) S.M.54

Programmable Logic Controller

1. BaldevRam MirdhaInstitute of Technology , Jaipur
A
Presentation
On
Programmable Logic Controller
Presented By :-
Subhash Mahla
[email protected]
Subhash Mahla ([email protected])

2. Programmable Logic Controller
( PLC )
Subhash Mahla ([email protected])

3. Objects:-
Introduction
Definition of PLC
Historical Background
Components of a Common PLC
Power Supply
Input Modules
Processor
Programming Device
PLC Size
Areas of Application
Example :-Tank Used to Mix Two Liquids
Programming Device
Subhash Mahla ([email protected])

4. Introduction of PLC :-
Thispresentationintroducesthebasichardwareand
softwarecomponentsofaProgrammableController
(PLC).
ProgrammableLogicControllersaresolidstatedevices
thatcanbe programmedtoperformed
sequentialanddiscretestateoperationonexternal
equipment
Theyaredesignedtoperformthelogicfunctions
previouslyaccomplishedbyelectromechanicalrelays,
drumswitches,mechanicalandelectronictimersand
counters,standalonedigitalPIDcontrollersetc.
Subhash Mahla ([email protected])

5. Programmable Logic Controllers :-
A digitally operating electronic apparatus which
uses a programming memory for the internal
storage of instructions for implementing specific
functions such as logic, sequencing, timing,
counting and arithmetic to control through digital
or analog modules, various types of machines or
process.
Subhash Mahla ([email protected])

6. Historical Background :-
•TheHydramaticDivisionoftheGeneralMotorsCorporation
specifiedthedesigncriteriaforthefirstprogrammablecontroller
in1968
•Toeliminatethehighcostsassociatedwithinflexible,relay-
controlledsystems.
•Thecontrollerhadtobedesignedinmodularform,sothatsub-
assembliescouldberemovedeasilyforreplacementorrepair.
•Thecontrolsystemneededthecapabilitytopassdata
collectiontoacentralsystem.
•Themethodusedtoprogramthecontrollerhadtobesimple,so
thatitcouldbeeasilyunderstoodbyplantpersonnel.
Subhash Mahla ([email protected])

7. Major Components of a Common PLC :-
PROCESSOR
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
From
SENSORS
Pushbuttons,
contacts,
limit switches,
etc.
To
OUTPUT
Solenoids,
contactors,
alarms
etc.
Subhash Mahla ([email protected])

8. Major Components of a Common PLC :-
POWER SUPPLY
Provides the voltage needed to run the primary
PLC components
INPUT MODULES
Provides signal conversion and isolation
between the internal logic-level signals inside
the PLC and the field’s high level signal.
Subhash Mahla ([email protected])

9. Major Components of a Common PLC :-
PROCESSOR
Provides intelligence to command and govern the
activities of the entire PLC systems.
PROGRAMMING DEVICE
used to enter the desired program that will
determine the sequence of operation and control of
process equipment or driven machine.
Subhash Mahla ([email protected])

10. PLC
INPUTS
OUTPUTS
MOTOR
LAMP
CONTACTOR
PUSHBUTTONS
Subhash Mahla ([email protected])

11. PLC Size :-
1.SMALL -itcoversunitswithupto128I/O’sandmemories
upto2Kbytes.
-thesePLC’sarecapableofprovidingsimpleto
advancelevelsormachinecontrols.
2.MEDIUM-have up to 2048 I/O’s and memories up to 32
Kbytes.
3.LARGE -themostsophisticatedunitsofthePLCfamily.They
haveupto8192I/O’sandmemoriesupto750
Kbytes.
-cancontrolindividualproductionprocessesorentire
plant.
Subhash Mahla ([email protected])

12. Areas of Application :-
Manufacturing / Machining
Food / Beverage
Metals
Power
Mining
Petrochemical / Chemical
Subhash Mahla ([email protected])

13. Tank Used to Mix Two Liquids :-
A
B
C
FS
MOTOR
TIMER
FLOAT SWITCH
SOLENOIDS
SOLENOID
1 -MINUTE
Subhash Mahla ([email protected])

14. Tank Used to Mix Two Liquids :-
Atankisusedtomixtwoliquids.Thecontrolcircuitoperatesas
follows:
1.Whenthestartbuttonispressed,solenoidsAandB
energize.Thispermitsthetwoliquidstobeginfillingthetank.
2.Whenthetankisfilled,thefloatswitchtrips.Thisde-
energizessolenoidsAandBandstartsthemotorusedtomix
theliquidstogether.
3.Themotorispermittedtorunforoneminute.Afterone
minutehaselapsed,themotorturnsoffandsolenoidC
energizestodrainthetank.Subhash Mahla ([email protected])

15. 4.Whenthetankisempty,thefloatswitchde-energizes
solenoidC.
5.Astopbuttoncanbeusedtostoptheprocessatanypoint.
6.Ifthemotorbecomesoverloaded,theactionoftheentire
circuitwillstop.
7.Oncethecircuithasbeenenergizeditwillcontinuetooperate
untilitismanuallystopped.
Tank Used to Mix Two Liquids :-
Subhash Mahla ([email protected])

16. Programming Device :-
Industrial Terminal ( Allen Bradley )
Program Development Terminal ( General Electric )
Programming Panel ( Gould Modicon)
Programmer ( Square D )
Program Loader ( Idec-Izumi )
Programming Console ( Keyence / Omron )
Subhash Mahla ([email protected])

17. N.O
C
L2 L1
L1
L2
OUTPUT MODULE
WIRING
MOTOR
CONTACTOR
O:4
0CONTACTOR
LADDER PROGRAM
L1
L2
FIELD WIRING
•SOLENOID
•VALVES
•LAMP
•BUZZER
Allen Bradley
Subhash Mahla ([email protected])

18. Subhash Mahla ([email protected])

19. Subhash Mahla ([email protected])