PLC-S7-200---中英文翻译-毕业论文

外文翻译译文FeaturesofthePositionModuleThePositionmoduleprovidesthefunctionalityandperformancethatyouneedforsingle-axis,open-looppositioncontrol:-Provideshigh-speedcontrol,witharangefrom20pulsespersecondupto200,000pulsespersecond-Supportsbothjerk(Scurve)orlinearaccelerationanddeceleration-Providesaconfigurablemeasuringsystemthatallowsyoutoenterdataeitherasengineeringunits(suchasinchesorcentimeters)orasanumberofpulses-Providesconfigurablebacklashcompensation-Supportsabsolute,relative,andmanualmethodsofpositioncontrol-Providescontinuousoperation-Providesupto25motionprofiles,withupto4speedchangesperprofile-Providesfourdifferentreference-pointseekmodes,withachoiceofthestartingseekdirectionandthefinalapproachdirectionforeachsequence-ProvidesremovablefieldwiringconnectorsforeasyinstallationandremovalFigure9-9EM253PositionModuleYouuseSTEP7--Micro/WINtocreatealloftheconfigurationandprofileinformationusedbythePositionmodule.ThisinformationisdownloadedtotheS7-200withyourprogramblocks.BecausealltheinformationrequiredforpositioncontrolisstoredintheS7-200,youcanreplaceaPositionmodulewithouthavingtoreprogramorreconfigurethemodule.TheS7-200reserves8bitsoftheprocessimageoutputregister(Qmemory)fortheinterfacetothePositionmodule.YourapplicationprogramintheS7-200usesthesebitstocontroltheoperationofthePositionmodule.These8outputbitsarenotconnectedtoanyofthephysicalfieldoutputsofthePositionmodule.ThePositionmoduleprovidesfivedigitalinputsandfourdigitaloutputsthatprovidetheinterfacetoyourmotionapplication.SeeTable9-8.TheseinputsandoutputsarelocaltothePositionmodule.AppendixAprovidesthedetailedspecificationsforthePositionmoduleandalsoincludeswiringdiagramsforonnectingthePositionmoduletosomeofthemorecommonmotordriver/amplifierunits.Table9-8InputsandOutputsofthePositionModuleSignalDescriptionSTPTheSTPinputcausesthemoduletostopthemotioninprogress.YoucanselectthedesiredoperationofSTPwithinthePositionControlwizard.RPSTheRPS(ReferencePointSwitch)inputestablishesthereferencepointorhomepositionforabsolutemoveoperations.ZPTheZP(ZeroPulse)inputhelpsestablishthereferencepointorhomeposition.Typically,theLMT+LMT+andLMT--inputsestablishthemaximumlimitsformotiontravel.ThePositionControlLMT--wizardallowsyoutoconfiguretheoperationofLMT+andLMT-inputs.motordriver/amplifierpulsesZPoncepermotorrevolution.P0P0andP1areopendraintransistorpulseoutputsthatcontrolthemovementanddirectionofP1movementofthemotor.P0+,P0--andP1+,P1--aredifferentialpulseoutputsthatprovidetheP0+,P0--identicalfunctionsofP0andP1,respectively,whileprovidingsuperiorsignalquality.TheP1+,P1--opendrainoutputsandthedifferentialoutputsareallactivesimultaneously.Basedupontheinterfacerequirementsofmotordriver/amplifier,youchoosewhichsetofpulseoutputstouse.DISDISisanopendraintransistoroutputusedtodisableorenablethemotordriver/amplifier.CLRCLRisanopendraintransistoroutputusedtocleartheservopulsecountregister.ProgrammingthePositionModuleSTEP7--Micro/WINprovideseasy-to-usetoolsforconfiguringandprogrammingthePositionmodule.Simplyfollowthesesteps:1.ConfigurethePositionmodule.STEP7--Micro/WINprovidesaPositionControlwizardforcreatingtheconfiguration/profiletableandthepositioninstructions.SeeConfiguringthePositionModuleonpage270forinformationaboutconfiguringthePositionmodule.2.TesttheoperationofthePositionModule.STEP7--Micro/WINprovidesanEM253controlpanelfortestingthewiringoftheinputsandoutputs,theconfigurationofthePositionmodule,andtheoperationofthemotionprofiles.Seepage290forinformationabouttheEM253controlpanel.3.CreatetheprogramtobeexecutedbytheS7-200.ThePositionControlwizardautomaticallycreatesthepositioninstructionsthatyouinsertintoyourprogram.Seepage273forinformationaboutthepositioninstructions.Insertthefollowinginstructionsintoyourprogram:--ToenablethePositionmodule,insertaPOSx_CTRLinstruction.UseSM0.0(AlwaysOn)toensurethatthisinstructionisexecutedeveryscan.--Tomovethemotortoaspecificlocation,useaPOSx_GOTOoraPOSx_RUNinstruction.TheOSx_GOTOinstructionmovetoalocationspecifiedbytheinputsfromyourprogram.ThePOSx_RUNinstructionexecutesthemotionprofilesyouconfiguredwiththePositionControlwizard.--Touseabsolutecoordinatesforyourmotion,youmustestablishthezeropositionforyourapplication.UsetheaPOSx_RSEEKoraPOSx_LDPOSinstructiontoestablishthezeroposition.--TheotherinstructionsthatarecreatedbythePositionControlwizardprovidefunctionalityfortypicalapplicationsandareoptionalforyourspecificapplication.4.Compileyourprogramanddownloadthesystemblock,datablock,andprogramblocktotheS7-200.TipRefertoAppendixAforinformationaboutconnectingthePositionmoduletoseveralcommonsteppermotorcontrollers.TipTomatchthedefaultsettingsinthePositionControlwizard,settheDIPswitchesonthesteppermotorcontrollerto10,000pulsesperrevolution.ConfiguringthePositionModuleYoumustcreateaconfiguration/profiletableforthePositionmoduleinorderforthemoduletocontrolyourmotionapplication.ThePositionControlwizardmakestheconfigurationprocessquickandeasybyleadingyoustep-by-stepthroughtheconfigurationprocess.RefertotheAdvancedTopicsonpage294fordetailedinformationa