Download - Exp Ing PLC
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POR: Jader MoreloEfran Ponce
Yonatan Garcs Johan Arias
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HISTORY OF PLCHISTORY OF PLCSSyy TheThe PLC PLC was was invented invented inin
responseresponse toto thethe needsneeds of of thethe American American automotiveautomotivemanufacturingmanufacturing industryindustry. .
yy TheThe first first ProgrammableProgrammableLogicLogic Controller Controller (PLC)(PLC) was was developed developed byby aa group groupof of engineersengineers atat General General Motors Motors inin 1968 1968, , when when thethecompanycompany were were lookinglooking for for anan alternativealternative totoreplacereplace complexcomplex relayrelaycontrol control systemssystems. .
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Structure ,Functionality and Programmingof a PLC
Structure
PLC`s have The basic structure
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Structure ,Functionality and Programmingof a PLC
Functionality and Programmingy The function of an input module is
to convert incoming signals intosignals, which can be processed bythe PLC, and to pass these to thecentral control unit. The reversetask is performed by an output
module. This converts the PLCsignal into signals suitable for theactuators.
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Structure ,Functionality andProgramming of a PLCPro ra iny User interface: Human-Machine Interface
(HMI)y
Co nications: Modbus, BACnet orDF1, DeviceNet or Profibus.y p ro ra in lan a es for
p ro ra a le control syste s: FBD(Function block diagram), LD (Ladderdiagram), ST (Structured text, similar to the
Pascal programming language), IL(Instruction list, similar to assembly language) and SFC (Sequential functionchart). These techniques emphasize logicalorganization of operations.
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A reas of application of a PLCA reas of application of a PLCy E very system or machine has a controller.
Depending on the type of technology used,controllers can be divided into pneumatic,
hydraulic, electrical and electroniccontrollers. Frequently, a combination of different technologies is used.
y
Typical applications for such controllers canbe found in automatic washing machines, video cameras, and cars.
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ADVAN TAGE SADVAN TAGE S
S impleS imple programming programmingProgramProgram changeschanges without without systemsystem
interventionintervention(no(no internal internal rewiringrewiring) )TheThe controller controller isis S maller S maller and and lowlow costcost
maintenancemaintenance
DIS A DV ANTAGESDIS A DV ANTAGES
TheThe controller controller isis expensiveexpensive and and moremore reliablereliablethanthan correspondingcorresponding relayrelay control control systemssystems. .
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improvementin the PLC
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y Businesses today, who
think in the future, areequipped with modernelectronic devices in
your machine andprocess control. Today automated factoriesshould include in theirsystems, high efficiency and flexibility.
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y PLC programming isdone through voice,ordering the desiredactions and store themin his memory to repeatprogressively
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y the dashboard just use acable that connectsdirectly to the machine
without using moresupplements
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y operate of eachmachine that has a PLCin the factory, operated
via a satellite from anoffice