外文翻译--PLC简介.doc

6.翻译：6.1外文资料PlcIntroductionProgrammablecontrolleristhefirstinthelate1960sintheUnitedStates,thencalledPlcprogrammablelogic.controller.(ProgrammableLogicController)isusedtoreplacerelays.Fortheimplementationofthelogicaljudgement,timing,sequencenumber,andothercontrolfunctions.TheconceptispresentedPlcGeneralMotorsCorporation.Plcandthebasicdesignisthecomputerfunctionalimprovements,flexible,genericandotheradvantagesandrelaycontrolsystemsimpleandeasytooperate,suchastheadvantagesofcheappricescombinedcontrollerhardwareisstandardandoverall.Accordingtothepracticalapplicationoftargetsoftwareinordertocontrolthecontentoftheuserproceduresmemorycontroller,thecontrollerandconnectingtheaccusedconvenienttarget.Inthemid-1970s,thePlchasbeenwidelyusedasacentralprocessingunitmicroprocessor,importexportmoduleandtheexternalcircuitsareused,large-scaleintegratedcircuitsevenwhenthePlcisnolongertheonlylogical(IC)judgementfunctionsalsohavedataprocessing,PIDconditioninganddatacommunicationsfunctions.InternationalElectrotechnicalCommission(IEC)standardspromulgatedprogrammablecontrollerforprogrammablecontrollerdraftmadethefollowingdefinition:programmablecontrollerisadigitalelectroniccomputersoperatingsystem,specificallyforapplicationsintheindustrialdesignenvironment.Itusedprogrammablememory,usedtoimplementlogicintheirinternalstorageoperations,sequencecontrol,timing,countingandarithmeticoperations,suchasoperatinginstructions,andthroughdigitalandanaloginputandoutput,thecontrolofvarioustypesofmachineryorproductionprocesses.Programmablecontrollerandrelatedperipherals,andindustrialcontrolsystemseasilylinkedtoformawhole,toexpanditsfunctionaldesign.Programmablecontrollerfortheuser,isanon-contactequipment,theprocedurescanbechangedtochangeproductionprocesses.Theprogrammablecontrollerhasbecomeapowerfultoolforfactoryautomation,widelypopularreplication.Programmablecontrollerisuser-orientedindustriesdedicatedcontrolcomputer,withmanydistinctivefeatures.First,highreliability,anti-interferencecapability；Secondprogrammingvisual,simple；Third,adaptabilitygood；Fourthfunctionalimprovements,strongfunctionalinterface1.SubjectcontentandapplicationscopeThisnationalstandardspecifiesthetechnicalrequirementsandqualityrequirementsforthelifttractionmachineswithratedspeedlessthan25m/s.Thisnationalstandardisapplicabletotractionmachinesdesignedforpassengerlift,sickbedliftandfreightlift.Itsinapplicabletothetractionmachinesdesignedfordumbwaiterliftandallkindsofliftswithratedspeednotlessthan2.5m/s.Theothertractionmachinesdesignedforallkindsofliftswithratedspeednotlessthan2.5m/scanmakereferencefromthisnationalstandardforenforcement.2.NormativereferencesGB3768Determinationofsoundpowerlevelsofnoise-SimplemethodGB7025Majorparameteroflift,versionanddimensionofcar,shaftandmachineroomGB7588SafetyRulesfortheConstructionandInstallationofLiftsGB10058SpecificationsforliftsGB10085BasicparametersofsingleenvelopingwormgearGB10089Cylindricalworm,wormwheelaccuracyGB12974GeneralTechnicalSpecificationsforACLiftMotorGB11368CleanlinessofgearassemblyGB191Packaging-Pictorialmarkingsforhandlingofgoods3.TerminologyRatedspeedoftractionmachineItsthelinearspeedofthepitchdiameteroftractionwheel,correspondingtotheratedspeedofcar.RatedloadoftractionmachineWhenthetractionratiois1:1andthebalancecoefficientis0.40,itmeanstheratedloadofthecarinthetangentialtractionofthetractionwheel.NationalStandardofthePeoplesRepublicofChinaGBT10058-1997SpecificationsforLiftsForewordThenationalstandardistheamendmenttotheoriginalSpecificationsforLiftsGB10058-88,maincontentofwhichareasthefollowing:1)Inchapter“wholeperformance”,theregulationsofclassificationarecanceled,whichincludeaccelerationandredardedspeedofverticalvibration,accelerationandredardedspeedofhorizontalvibration,aswellasindicatorsofnoiseandlevelingaccuracy.2)Forimprovingoperationefficiencyofthelifts,therequirementstoopentimeandclosetimeofpassengerliftsareaddedinthenationalstandard.3)Inchapter“reliability”,theregulationofclassificationofreliabilityindicatoriscanceled；examiningrequeststocontrolcabinetwhichisconsideredascommoditycomponentareaddedinthenationalstandard.4)InAppendixA,specificregulationsaremadetotechnicaldocumentskeptinmanufactureraftersaleoflifts.ThestandardwillreplaceGB10058-88sincetheeffectivedate.AppendixAisastandardappendix.ThestandardisproposedbyMinistryofConstructionofthePeoplesRepublicofChina.ThestandardisunderthejurisdictionofChinaLiftStandardizationTechnicalCommittee.ThisstandardisdraftedbyInstituteofConstructionMechanizationofChinaAcademyofBuildingResearch,BeijingSchindlerElevatorCo.,LtdinChina,TianjinOtisElevatorCo.,LtdinChina,andGuangzhouElevatorIndustryCo.,Ltd.ThestandardismainlypreparedbyKerongPeng,GuozhenZhang,XiaohuiXiandXizhiYang.Thestandardwasfirstlyissuedin1988andfirstlyrevisedin1997.1ScopeThestandardformulatestechnicalspecificationsofpassengerliftsandfreightlifts,inspectionprovisions,indicationmarks,package,transportationandstorage.Thestandardisapplicabletopower-actuatedtraction-typeorcompulsory-typepassengerliftsandfreightliftswhoseratedspeedisnothigherthan2.5m/s；Thestandardisinapplicabletohydraulicliftsanddumbwaiterlifts.2NormativeReferencesThearticlesincludedinthefollowingstandardsbecomethearticlesofthenationalstandardbyquotation.Thelistededitionsareefficientwhilethestandardispublished.Allstandardswillberevised,soallpartieswhousethefollowingstandardsshouldconsiderthelatesteditionaspossible.GB2828-87In-batchCheckCountingSamplingProcessandSampleTable(suitableforcontinuousbatch)GB7588-1995SafetyCodeforManufacturingandInstallationofLifts(eqvEN81-1:1985)Inthiscode,Chapter1,Chapter2,Chapter3,Chapter4,Section7.2.1(partial),Section8.17.1,Section9.1.2b),Section(partial),Section12.6(partial),Section,Section(partial),Section16.2a)6)(partial),AppendixC,AppendixE,AppendixG,AppendixMandAppendixZAarerecommendatory；therestareobligatory.ThiscodeistherevisedversionofGB7588-1995SafetyRulesfortheConstructionandInstallationofLifts(equivalenttoEN81-1:1985)onthebaseofEN81-1:1998SafetyRulesfortheConstructionandInstallationofLiftsissuedbyEuropeanCommitteeforStandardization(CEN).ThisrevisedversionisequivalenttoEN81-1:1998inthefieldsoftechnicalcontentsandarticlenumbering.ComparedwithEN81-1:1985,EN81-1:1998changedhugepartsofcontents.Thenewversionincreasesplentyofnewtechnicalcontentsandnewcalculationmethod.BesidesafewpartsarechangedaccordingtotheChinseliftsituations,thisrevisedversionisbasicallycomplianttothecontentsofEN81-1:1998.Intherevisedversion,thefollowingmajortechnicalcontentsa