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1、IIAbstractWiththerapiddevelopmentoftheautomaticcontroltheory,thenetworksoftheindustrialcontrolandthetechnologyofthecomputer,communicationnetworkandsoon,Ontheoccasionsintheindustrial,asinglemotorcontrolcannolongermeettheneedsoftheactualproductionprocess,moreandmoreoccasions,theneedf
2、orsimultaneouscontrolofmultiplemotorsisexisted,theproblemofthemulti-motorcontrolhasbecomeanimportantelementofthedevelopmentandresearchincontrolindustry.Inthispaper,onthebasisofthedescribingVVVFtechnology-relatedknowledge,andfunctionalanalysisofthePLC,basedonfullconsiderationoftheco
3、st,maintenancereliabilityandmanyotherfactors,amulti-motorcontrolsystemprogramisproposed,itisconstituteofamachinefromthePC,SiemensPLC,frequencyconversiondevices,andasynchronousmotoretc.Wehavetheoveralldesignofthecontrolsystem,andhaveakeyanalysisfortheprincipleandcharacteristicsofmul
4、ti-motorsynchronouscontrol,identifysynchronouscontrolprogram,proposeacontrolstrategyformulti-motorsynchronousbasedonfuzzyPIDcompensator,andgivethedesignmethodoffuzzyPIDcompensator.UsingtheUSSprotocolbasedontheRS485interfacetocarryouttheserialcommunicationofthePLCandfrequencyconvert
5、er,anddiscussingtheUSSagreementhowtocontroltheinverterandproceduresforthedesign.ThroughtheUSSprotocol,S7-200PLCcouldreadandsettheinverterparametersinreal-time.ItalsodetailstheserialportcommunicationconditionsbetweenHostComputerandthetypeofSiemensS7-200PLCaswellastheuseofhigh-levell
6、anguagetocompiletheprincipleofcommunicationinterfacebetweenPLCandthePCmachine.TheuseofPLC-free-portcommunicationcouldachievetheserialdatatransmissionbetweenPCandHostComputer,theinverter'sinformationwillsendtotheuppermachineinreal-timethroughS7-200,achievingthereal-timecommunication
7、sbetweenthecomputerandPLC.BytheuseofPLC'sownlogicofoperationanddataprocessingcapabilitytoenableadesignofmonitoringsystem,andultimatelycarryoutthedevices'real-timemonitoringoftheworkingconditionswhichisconnectedtothePLC.Thepaperbyinvertercontroltoachievethepurposeofmotorcontrol,andt
8、oachievethesurveillanceoft