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1、外文資料:PLCtechniquediscussionandfuturedevelopmentEveryoneknowsthere'sonlyoneconstantinthetechnologyworld,andthat'schange.ThisisespeciallyevidentintheevolutionofProgrammableLogicControllers(PLC)andtheirvariedapplications.Fromtheirintroductionmorethan30yearsago,PLCshavebecomethecorne
2、rstoneofhundredsofthousandsofcontrolsystemsinawiderangeofindustries.Atheart,thePLCisanindustrializedcomputerprogrammedwithhighlyspecializedlanguages,anditcontinuestobenefitfromtechnologicaladvancesinthecomputerandinformationtechnologyworlds.Themostprominentofwhichisminiaturizatio
3、nandcommunications.Thepeopleseeinproducepractice,automatebroughtthetremendousconvenienceandtheproductquantitiesforpeopleupofassurance,alsoeasedthepersonnel'slaborstrength,reducetheestablishmentonthepersonnel.Thetargetcontrolofthehardrealizationinmanycomplicatedproductionlines,who
4、leandexcellentturn,thebestdecisionetc.,well-trainedoperationwork,technicalpersonnelorexpert,governorbutcanjudgeandoperateeasily,canacquirethesatisfiedresult.Theresearchtargetoftheartificialintelligencemakesuseofthecalculatorexactlytocarryout,imitatetheseintelligencesbehavior,mode
5、ratingtheworkthroughperson'sbrainandcalculators,withthemodethatperson'smachinecombine,forresolvetheverycomplicatedproblemtolookforthebestpathInrecentyears,smallerPLCshavebeenintroducedinthenanoandmicroclassesthatofferfeaturespreviouslyfoundonlyinlargerPLCs.Thishasmadespecifyingal
6、argerPLCjustforadditionalfeaturesorperformance,andnotincreasedI/Ocount,unnecessary,aseventhoseinthenanoclassarecapableofEthernetcommunication,motioncontrol,on-boardPIDwithautotune,remoteconnectivityandmore.PLCsarealsonowwell-equippedtoreplacestand-aloneprocesscontrollersinmanyapp
7、lications,duetotheirabilitytoperformfunctionsofmotioncontrol,dataacquisition,RTU(remotetelemetryunit)andevensomeintegratedHMI(humanmachineinterface)functions.Previously,thesefunctionsoftenrequiredtheirownpurpose-builtcontrollersandsoftware,plusaseparatePLCforthediscretecontroland
8、interlocking.PLClanguageisnotweimagineof
