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TheshallowtreadsintothePLCcontroltechniqueanddevelopmenttrendofelectricalengineering1.Sayall:Alongwiththemicro-electronicstechniqueandthecalculatortechnicalhairExhibition,theprogrammableprefacecontrollerhasanadvancebyleapsandboundsofhairExhibition,itsfunctionhasalreadyoutrunalogiccontrolfarandfar,inproperorderThescopeofcontrol,ithasaneffecttocombinewithcalculator,canenterGotoimitatetocontrolmost,havealongrangecorrespondencefunctionetc..Have-ThepersoniscalleditthemodernDindustrycontrolsofthreepaypillargreatly(namelyPLC,robot,CAD/CAM)ita,currentlyprogrammablecontrollerBEappliedinmetallurgyextensively,Mineralindustry,machine,lightClassDrealm,automatefortheindustryProvidedtothereisthetoolofonedintThePLCcontrolsoftreadtoopenthewreathservoorganizationintotheelectricalengineeringshouldUsedforcombiningtoolmachinetoproduceanon-linenumbertocontrolaslipperypedestaltocontrolautomaticallyMake,cantheprovincegotothenumberofthatunittocontrolsystem,makingthatunitThecostofcontrollingthesystemlowers.2、Whatisasteppermotor：Steppermotorisakindofelectricalpulsesintoangulardisplacementoftheimplementingagency.Popularlittlelesson:Whenthedriverreceivesasteppulsesignal,itwilldriveasteppermotortosetthedirectionofrotationatafixedangle(andthestepangle).Youcancontrolthenumberofpulsestocontroltheangulardisplacement,soastoachieveaccuratepositioningpurposes;thesametimeyoucancontrolthepulsefrequencytocontrolthemotorrotationspeedandacceleration,toachievespeedcontrolpurposes.Whatkindsofsteppermotorsub-：Inthreesteppermotors:permanentmagnet(PM),reactive(VR)andhybrid(HB)permanentmagnetstepperusuallytwo-phase,torque,andsmaller,stepangleof7.5degreesorthegeneral15degrees;reactionstepisgenerallythree-phase,canachievehightorqueoutput,stepangleof1.5degreesisgenerally,butthenoiseandvibrationarelarge.80countriesinEuropeandAmericahavebeeneliminated;hybridstepperisamixofpermanentmagnetandreactiveadvantages.Itconsistsoftwophasesandthefive-phase:two-phasestepangleof1.8degreeswhilethegeneralfive-phasestepangleof0.72degreesgenerally.ThemostwidelyusedStepperMotor.Whatistokeepthetorque(HOLDINGTORQUE)3、Treadintothebasiccharacteristicsofelectricalengineering:（1）、treadgenerallyintotheaccuracyoftheelectricalengineeringfortreadintoCapeof3-5%anddon'taccumulate.（2）、tallesttemperatureswhichenterelectricalengineeringoutwardappearanceandallowtreadandleadintotheelectricalengineeringtemperaturehighcanmakethemagnetismmaterialofelectricalengineeringbackfirst,causethedintdescendthusisasforloseastep,sotheelectricalengineeringoutwardappearanceallowofthetallesttemperatureshouldbedecidedbysmallbackwithelectricalengineeringmagnetismmaterialandorder;Speakgenerally,themagnetismmaterialbackstoorderallabovehavein130Canofevenbeupto200Cabove,sotreadcompletelynormalintotheelectricalengineeringoutwardappearancetemperaturein80-90C.（3）、dintswhichenterelectricalengineeringwouldwithturntogoupbutdescendsoon，Whiletreadingtoturntomoveintotheelectricalengineering,electricalengineeringeachelectricityfeelingwhichroundasetmutuallywillbecomeoneanti-toelectromotiveforce;Thefrequencyismorehigh,anti-toelectromotiveforcemorebig，biginitsfunction,theelectricalengineeringenlargeswiththefrequency(orspeed)butmutuallytheelectriccurrentletup,causingthedintdescendthus.（4）、canrevolvenormallywhen4enterelectricalengineeringlowspeed,butifhighincertainthespeedcan'tstart,andthecompanionhavearoartheinterjectiontreadtohaveatechniqueparameterintotheelectricalengineering:emptycarrystartfrequency,thentreadintoelectricalengineeringatemptycarryundercircumstancecanstartnormallyofpulsefrequency,ifthepulsefrequencyishighinshouldbeworth.,Theelectricalengineeringcan'tstartnormally,thepossibleoccurrencethrowsasteporblocksuptoturn.Underthesituationthatthereisoneload,thestartfrequencyshouldbemuchlowerifwanttomaketheelectricalengineeringattainhighspeedtoturntomove,thepulsefrequencyshouldhaveanaccelerationprocess,thenstartthefrequencyislower,thenpresscertainaccelerationtorisethehighhoped.Treadtoshowthecharacteristicsofwithitintotheelectricmotor,turnagesofmanufacturingtodevelopimportantusetoaccompanywithinthenumeralsmalltogetherofnumeralturntechnicalofdevelopmentandtreadintotheelectricalengineeringtechnicalexaltation，treadwillgetanapplicationinmorerealmsintotheelectricalengineering.4、enteranelectricalengineeringcontrolsystemtoconstitute：TreadisakindofperformanceorganizationthatwillgiveorgetanelectricshockapulseconversiontomovefortheCapeintotheelectricalengineering.Whentreadtoreceivetoapulsesignalintotheactuator,itdrivesasteptopressthedirectionofenactmenttoturntomoveanangleforfixingtobecalledtreadtobeapartfromCapeintotheelectricalengineering,itrevolvesone-stepcirculatewiththefixedangleonestep.CanpasscontrolpulsepiecetocontrolaCapetomovetoattainthepurposeofassurancemostandthus;Canpasscontrolpulsefrequencytocontrolelectricalengineeringtobecomedynamicspeedandaccelerationinthemeantime,thepurposeattainedtoadjustthussoontreadsintotheelectricalengineering.Canbethespecialkindelectricalengineeringthatakindofcontroluses,makeuseofitdidn'taccumulatee