PLCQUESTIONPLCwhichshouldpayattentionintheapplicationisspeciallythecontroldevicewhichservesfortheindustrialproduction,usuallydoesnotneedtotakeanymeasure,mayusedirectlyintheindustryenvironment.But,whentheproductionenvironmentistoobad,theelectromagneticinterferenceisspecialintense,orinstallsusesimproper,cannotguaranteePLCthenormaloperation,thereforeshouldpayattentiontothefollowingquestionintheuse.First,installmentandwiring(1)Thepowerline,thepilotwireaswellasthePLCpowerlineandtheI/Olineshoulddistinguishthewiring,betweentheinsulatingtransformerandPLCandI/Oshouldusethedoublerubberizedwireconnection.(2)PLCshouldbefarawayfromthestrongjammingsourcelikeelectricweldingmachine,thehighefficiencysiliconrectifierunitandthelarge-scalepowerequipment,cannotinstallwiththehigh-pressuredelectricapplianceintheidenticalswitchcabinet.(3)TheinputandoutputofPLCarebestseparatetheline,theswitchquantityandthesimulationquantitymustseparatetheplacing.Thesimulationquantitysignal'stransmissionshouldusetheshieldedwire,theshieldinglayershouldanendorthebothsidesearth,andtheearthresistanceshouldbesmallerthantheshieldinglayerresistance1/10.(4)ThePLCelementalareaandtheexpansionunitaswellasfunctionalmodule'stiescableshouldliealone,preventstheoutsidesignalthedisturbance.(5)Theexchangeoutputlineandthedirect-currentoutputlinedonotusetheidenticalrootelectriccable,theoutputlinetobefarawayfromthehightensionlineandthepowerlineasfaraspossible,avoidsparallel.Second,I/Oendwiring1.Inputwiring(1)inputsthewiringnottosurpass30metersgenerally.Butiftheenvironmentdisturbanceissmall,whenthelossofvoltageisnotbig,theinputwiringmaysuitablelong.(2)Inputs/theoutputlinenottobeabletousetheidenticalrootelectriccable,theinput/outputlinetobeseparated.(3)Usesthenormallyopenedcontactformtoconnecttheinputendasfaraspossible,causestheestablishmentthetrapezoidalcharttobeconsistentwiththerelayschematicdiagram,isadvantageousforreading.2.Outgoingjunction(1)Theout-putwiringdividesintotheindependentoutputandthepublicoutput.Innotgroup,mayusethedifferenttypeandthevoltageclassoutputvoltage.Butcanonlyusetheidenticaltype,theidenticalvoltageclasspowersourceintheidenticalgroup'soutput.(2)BecausethePLCoutputelementissealedontheprintcircuitwafer,andconnectstotheterminalstrip,ifwillconnectoutputelement'sloadshortcircuit,willburndowntheprintcircuitwafer,therefore,applicationfuseprotectionoutputelement.(3)Useswhentherelayoutputs,withstandsinductiveload'ssize,willaffectrelay'sservicelife,therefore,timeuseinductiveloadtheselectiverelayworkinglifemustbelong.(4)ThePLCoutputloadpossiblyhasthedisturbance,mustthereforetakethemeasuretocontrol,ifdirect-currentoutput'safterflowguaranteesprotects,theexchangeoutputanti-accommodatestheabsorbingcircuit,thetransistorandthebidirectionalthrusteroutputby-passedresistorprotection.Third,outsidesecurityelectriccircuittoguaranteethattheoverallsystemcanunderthesecurestatethereliablework,avoids,becausetheexternalpowersupplybreaksdown,PLCtopresenttheheavyeconomiclosswhichandthepersoncasualtyexceptionally,thedisoperationaswellasoutputsbymistakecreates,PLCtheoutsideshouldinstalltheessentialprotectioncircuit.(1)Stopstheelectriccircuitanxiously.Regardingcancausetheusertocausethedamagethedangerousload,besidesperformsinthecontrolproceduretoconsider,butalsoexteriorshoulddesigntheemergencystopelectriccircuit,causeswhenPLCbreaksdown,cancause...
