机械专业英文文献下载更多的PAC技术论文和视频教程.docx
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机械专业英文文献下载更多的PAC技术论文和视频教程.docx
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机械专业英文文献下载更多的PAC技术论文和视频教程
DownloadingmorePACtechnicalpaperand
videofrequencycourse
HasproducedalongwithmanymerchantscanunifythePCfunctionandthePLCreliableprogrammableautomationcontroller(PAC),atpresentthecontrolsystemgraduallystartedtousePAC.ThiswhitepaperintroducedPACtheoriginaswellasitwithPLCandthePCdifference,andhadpointedoutwillusePACtheindustrytocontrolthefuturedevelopmentdirection.
Tableofcontents
PACwillbecomethefuturetheindustrycontrolmode
"80-20"principle
Constructsabettercontroller
Twokindofdifferentsoftwaressolution
PACvisionandsurveyapplication
PAChasavoidedtothespecialhardwareneed
LabVIEWusesintheautomatedcontrol
NIPACsystem
PACwillbecomethefuturetheindustrycontrolmodewithcomparesbasedonthePCcontrolsystem,relatedPLC(programmablelogicalcontroller)thesuperiorityandtheinferiorityintenseargumenthasalreadycontinuedfortenyears.BecausePCandPLCaremoreandmoresmallinthetechnicaldifference,andhasusedthecommercializationalongwithPLC(COTS)thehardwareaswellasPCcanusethereal-timeoperatingsystem,thusappearedonekindofnewformcontroller-PAC.ThePACconceptis(ARC)proposesbytheautomationdevelopmentfacility,itexpressedtheprogrammableautomatedcontroller,usedindescribingunifiedPLCandthePCfunctionnewgenerationofindustrycontroller.ThetraditionalPLCmerchantusesPACtheconcepttodescribetheirhighendsystem,butPCcontrolmerchantthenusesfortodescribetheirindustrializationtocontroltheplatform.
"80-20"principle
InPLCin30yearswhichdeveloped,itpassesthroughdevelopsunceasingly,alreadycouldunifysimulatesI/O,thenetworkcorrespondsaswellasusesnewprogrammingstandardlikeIEC61131-3.However,engineersonlymustusedigitalI/OandfewsimulationsI/Onumberaswellassimpleprogrammingskillonpotential80%industrialapplication.ComesfromARC,theunitexploitationcompany(VDC)aswellasonthenetPLCtrainingresourcesPLC.Thenetexpertestimatedthat,
77%PLCusesinthesmallapplication(beinglowerthan128I/O)
72%PLCI/Oisanumeral
80%PLCapplicationmayuse20trapezoidallogicalsetsofinstructionstosolve
Becauseusestraditionalthetooltobepossibletosolve80%industrialapplication,likethisintenselyneedstohavelowcostsimplePLC;ThuspromotedthelowcostminiaturePLCgrowth,ithastheusefultrapezoidallogicalprogrammingdigitalI/O.However,thishasalsocreatedthediscontinuityinthecontroltechnology,ontheonehand80%applicationneedtousethesimplelowcostcontroller,butontheotherhandother20%applicationthenhavesurpassedthefunctionwhichthetraditioncontrolsystemcanprovide.Engineerisdevelopingthese20%applicationtoneedtohavethehighercirculationspeed,theseniorcontrolalgorithm,themoresimulationsfunctionaswellascanwellandtheenterprisenetworkintegration.
In80andthe90's,thesemustdevelop"20%application"engineershadconsideredusesPCintheindustrycontrol.PCprovidesthesoftwarefunctionmaycarryouttheseniortask,providestherichprogrammingandtheuserenvironment,andthePCCOTSpartenablescontrolengineerthetechnologywhichdevelopsunceasinglytouseinotherapplications.Thesetechnologiesincludingfloatingpointprocessor;HighspeedI/Omainline,likePCIandethernet;Fixeddatamemory;softwaredevelopmentkit.MoreoverPCalsocanprovidetheincomparableflexibility,highlyeffectivesoftwareaswellasseniorlowcosthardware.
However,PCisnotextremelysuitabllyusesincontrollingtheapplication.AlthoughmanyengineersinintegratedseniorfunctiontimeusesPC,thesefunctionsincludingsimulationcontrolandsimulation,connectiondatabase,networkfunctionnfaswellaswiththirdpartyequipmentcorrespondence,butPLCstillwasatthedominantpositioninthecontroldomain.IsstandardPCisnotbutdesignsbasedonthePCcontrolmainquestionforthestrictindustryenvironment.
PCmainlyfacesthreemajorproblems:
Stability:
TheusualPCgeneraloperatingsystemcannotprovideusesincontrollingtheenoughstability.TheinstallmentcanforcetheprocessingsystemcollapsebasedonthePCcontrolequipmentandnotexpecttoagainopens.
Reliability:
BecausePChasthemagneticharddiskandthenon-reliablepartwhichrevolves,likethepowersource,thismakesittobeeasiertoappearthebreakdown.
Notfamiliarprogrammingenvironment:
Thefactoryoperatorneedstohavewhenmaintainsandfixesthebreakdownrestoresthesystemtheability.Theusetrapezoidallogic,theymaymanualforcethecoiltorestoretotheperfectcondition,andcanfastpatchthecodewhichaffectsbyisfastrestoredthesystem.However,thePCsystemneedstheoperatortostudythenewhigherparaffinthetool.
Althoughcertainengineersusehavethefirmhardwareandthespeciallyoperatingsystemspecial-purposeindustrycomputer,butbecauseEngineerPCreliableaspectquestionoverwhelmingmajorityavoidsinthecontrolusingPC.Inaddition,usesineachkindofautomateddutyequipmentinPC,likeI/O,correspondence,ormovementpossibleneeddifferentdevelopmentenvironment.
Thereforethesemustdevelop"20%application"engineerseitherusePLCtobeunablewitheasetorealizethefunctionwhichthesystemneeds,eitherusesbothcontainsPLCandtocontainPCthemixsystem,theyusePLCtocarryoutthecodecontrolsection,realizesthehigherparaffinfunctionwithPC.ThusthepresentmanyfactoriesworkshopsusethesystemwhichPLCandPCunifies,inusesystemPCcarriesonthedatarecord,theconnectionbarcodescanner,insertstheinformationinthedatabaseaswellasissuesthedatatotheneton.Usesthiswayestablishmentsystemthemainquestionisthissystemwithdifficultyconstructsfrequently,fixesthebreakdownandthemaintenance.Systemengineermustunifyfrequentlycomesfrommanymerchantssoftwareandhardwareworktopuzzle,thisisbecausetheseequipmentarenotbutdesignforcanthejointoperation.
Constructsabettercontroller
BecausedoesnothavesuitablePCorthePLCsolution,theseneeddevelopmentcomplexapplicationengineerondevelopsthenewproductwiththecontrolmerchantclosecooperation.TheyneedthenewproducttobeabletounifyPCtheseniorsoftwarefunctionandthePLCreliability.TheseimportantuserswerePLCandhaveprovidedtheproductdevelopmentinstructionbasedonthePCcontrolcompany.
Realizesthesoftwarefunctionnotonlytoneedtohavetheseniorthesoftware,moreoverthecontrollerhardwarefunctionalsoneedstohavetheenhancement.BecauseintheworldscopeisdroppingtothePCpartdemand,thereforemanysemiconductorsmerchantsstartfortheindustrialapplicationredesigntheirproduct.Atpresentcontrolsthedomainthemerchanttostartintheindustrycontrolproducttousetheindustrializationfloatingpointprocessor,DRAM,solidstatememorylikeCompactFlashaswellasthefastEthernetchip.ThisenablesthemerchanttousebasedonthePCcontrolsystemflexibilityandtheusabilitydevelopsamoreformidablesoftware,moreoverthisPCcontrolsystemalsomaymovethereal-timeoperatingsystembytoguaranteethereliability.
Thiskindofnewcontrolleristhesolution"20%"theapplicationquestionbutdesigns,itunifiedPLCandthePCtwomerits.TheARCindustryanalystiscalledthiskindofequipmenttheprogrammableautomatedcontroller,namelyPAC."Theprogrammablelogicalcontrollerworldlooksatingenerally"theresearchinARC,theyhaveproducedthePACfiveprincipalcharacteristics.Thesecontrollercharacteristicsarethroughdefinethesoftwaretheabilitytorealizeitsfunction.
"Multi-purpose,hasinthelogic,themovement,thePIDcontrol,theactuationandprocessinginaplatformatleasttwokindofabovefunctions."ExceptthatinordertorealizespecialagreementlikeSERCOStohavetoI/Omakessomeimprovements;Moreoverthesoftwarealsocanprovidelogical,themovement,processingandthePIDfunction.Forexample,themovementcontroltookthesoftwarecontrolcirculation,itcanreadingthedigitalinputfromtheorthogonalencoder,theexecutionsimulationcontrolcirculatesandoutputsthecontroldevicethesimulatedsignal.
"Thesolemulti-regulationsdeveloptheplatformusegenerallabelandthesoledatabasevisitallparametersandthefunction."BecausePACislikemulti-purposebutdesignsformoretheseniorapplication,theyneedtheseniorsoftware.Inordertocanhighlyeffectivedesignthesystem,thesoftwaremustbethesoleintegratedsoftwarepackage,butisnotthemanykindsofseparationssoftwaretool,thesesoftwaretoolsintheprojectcannottheseamlessjointoperation.
"ThroughunifiesIEC61131-3,theuserguideandthedatamanagement,thesoftwaretoolcandesignissurmountingmanymachinesandtheprocessingunitprocessingflow."Thesimplificationsystemdesignontheotherhandishastheseniorthedevelopmentkit,usesthistooltobepossibletocauseengineerverywitheasetotransformtheprocessingconceptforcanactualcontrolthemachinethecode.
"Theopeningmodularskeletoncansolvetheindustrialapplicationmaydistributefromthecontrolinthefactorymachinetoprocessesworkshoptheoperationunit."Becauseallindustrialapplicationallneedstohavehighlyhascustom-madethecharacteristic,thereforethehardwaremustbethemodulationinordertoengineersmaychoosetheappropriatepart.Moreover,thesoftwarealsomustbeabletoletengineerincreaseandthedemolitionmodulebythesystemwhichdesignsneeds.
"Usesalreadythenetworkinterfacestandardwhichhas,thela
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