机电 自动化控制类 外文翻译 外文文献 英文文献 为柔性制造系统设计的可编程控制器平台.docx
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TheoreticalComputerScience253(2001)61{93
DevelopingaHybridProgrammableLogicControllerPlatformforaFlexibleManufacturingSystem
HenningDierks1
UniversityofOldenburg,FachbereichInformatik,Postfach2503,2900Oldenburg,Germany
Abstract:
Inthisarticle,wepresentthedesignandimplementationofaflexiblemanufacturingsystem(FMS)controlplatformbasedonaprogrammablelogiccontroller(PLC)andapersonalcomputer(PC)-basedvisualman-machineinterface(MMI)anddataacquisition(DAS)unit.ThekeyaspectofanFMSisitsflexibilitytoadapttochangesinademandingprocessoperation.ThePLCprovidesfeasiblesolutionstoFMSapplications,usingPC-basedMMI/DAS,wherebyPLCsareoptimizedforexecutingrapidsequentialcontrolstrategies.PCsrunningMMI/DASfront-endsmakeintuitiveoperationinterfaces,fullofpowerfulgraphicsandreportingtools.InformationfromthePCcanbedistributedthroughacompany’slocalareanetworkorwebusingclient-servertechnologies.Currently,withtheconvergenceofunderlyingmicroprocessortechnologyandsoftwareprogram-mingtechniques,manyusersfindthatPLCsprovideacost-effectivesolutiontoreal-timecontrolinsmall-tomedium-sizedprocessplants,especiallywhencombinedwithsupervisoryPCsusinghybridsystems.ThemajorworkofthisarticledemonstratesthatPLCsareresponsivetorapidandrepetitiouscontroltasks,usingPCsthatpresenttheflowofinformationautomationandacceptoperatorinstructions,therebyprovidingtheuseratooltomodifyandmonitortheprocessastherequirementschange.
KeyWords:
PLC、FMS、PC.
1.Introduction
Inavarietyofproductmanufacturingindustries,themostautomatedformofproductionisaFlexiblemanufacturingsystem(FMS),firstintroducedin1970s.SincetheFMSscanprovideahighpotentialforproductivityimprovementinbatchmanufacturing,thenumberofFMSsisgrowingsubstantially(GrooverandZimmers,1984).Theaccelerationthroughouttheworldisduetoincreasedglobalcompetition,reducedmanufacturingcycletimes,andcutsinproductioncosts.
Generally,anFMSconsistsofagroupofmachinesorotherautomatedworkstations,whichformintomodularsubsystems,suchasCNCmachines,robots,visionsystems,andaprocessstation.Theseareinterconnectedbyamaterialshandlingsystemandusuallydrivenbyacomputer(Maleki,1991).Eachmodularsystemrequiresanindividualmodularcontrolsystem,withdifferentcomponentsbeingcontrolledbyindividualcontrollerunits.Allofthemodularsubsystemsarecontrolledbycomputersasusual.Thesecontrollersperformtheirintendedtasksundersupervisionofahigherlevelcontroller.Tothesystem,boththecontroldevicesaswellastheflowofinformationneedtobeautomated.ThekeyaspectofanFMSisitsabilitytoadapttochangesinthecontroltasks.This flexibilityincludesthequantitiesand varietiesofparttypeswhichitcanproduce,theorderinwhichoperationsmaybeperformed,anditsabilitytoreroutepartsbackintoflowpaths.Intheend,thecontrolplatformshouldhavethecapabilitytoautomatetheflowofinformation.
Typically,there are three typesof controlplatforms used inFMSs:
minicomputers,microcomputers,andPLCs(Maleki,1991).Theminicomputersarebestsuitedforcomplexlarge-scale,continuous,regulatorycontrolapplications.ThePLCsareusedforrapidandrepetitiouslogiccontrol.Personalcomputers(PCs)aresuitedforoperatorinterfacefunctions.Primarily,PLCsaredesignedtoreplacehardwiringrelays,tooperateinanindustrialenvironment,tobeeasily modifiedbyplantengineersandmaintenancepersonnel,andtobemaintainedbyplantelectricians.Currently,withtheconvergenceofunderlyingmicroprocessortechnologyandsoftwareprogramming,manyusersfindthatPLCsprovideacost-effectivesolutionto
real-timecontrolinsmall-tomedium-sizedprocessplants,especiallywhencombinedwithsupervisoryPCsusinghybridsystems.
Thepurposeofthisarticleistoaddressthestate-of-the-arttechnologyofFMSs.ThedesignandconstructionofanFMSusingPLC-controlledandPC-basedvisualman-machineinterface(MMI)anddataacquisitionsystem(DAS) arepresented.Itisorganizedasfollows.Section2beginswiththedescriptionoftheFMSonthefactoryflooroftheCenterforManufacturingSystemsattheNewJerseyInstituteofTechnology(NJIT).Section3showstheoperationaldescriptionoftheFMS.Sections4and5presenttheapplicationsofPLC-controlledandPC-basedMMI/DASfortheFMSatNJIT.Section6containsasummaryoftheadvantagesofthisPLC-controlledandPC-basedMMI/DASforFMSapplication.
2.DescriptionoftheFMS
SIhandlingconveyorsystem
Thisconsistsoffourcarts,A,B,C,andD,withfixturesmountedoneach,twotransfertables,TT1andTT2,anddualconveyorswhichtran
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