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1、PLCQUESTIONPLCwhichshouldpayattentionintheapplicationisspeciallythecontroldevicewhichservesfortheindustrialproduction,usuallydoesnotneedtotakeanymeasure,mayusedirectlyintheindustryenvironment.But,whentheproductionenvironmentistoobad,theelectromagnetic
2、interferenceisspecialintense,orinstallsusesimproper,cannotguaranteePLCthenormaloperation,thereforeshouldpayattentiontothefollowingquestionintheuse.First,installmentandwiring(1)Thepowerline,thepilotwireaswellasthePLCpowerlineandtheI/Olineshoulddistingu
3、ishthewiring,betweentheinsulatingtransformerandPLCandI/Oshouldusethedoublerubberizedwireconnection.(2)PLCshouldbefarawayfromthestrongjammingsourcelikeelectricweldingmachine,thehighefficiencysiliconrectifierunitandthelarge-scalepowerequipment,cannotins
4、tallwiththehigh-pressuredelectricapplianceintheidenticalswitchcabinet.(3)TheinputandoutputofPLCarebestseparatetheline,theswitchquantityandthesimulationquantitymustseparatetheplacing.Thesimulationquantitysignal'stransmissionshouldusetheshieldedwire,the
5、shieldinglayershouldanendorthebothsidesearth,andtheearthresistanceshouldbesmallerthantheshieldinglayerresistance1/10.(4)ThePLCelementalareaandtheexpansionunitaswellasfunctionalmodule'stiescableshouldliealone,preventstheoutsidesignalthedisturbance.(5)T
6、heexchangeoutputlineandthedirect-currentoutputlinedonotusetheidenticalrootelectriccable,theoutputlinetobefarawayfromthehightensionlineandthepowerlineasfaraspossible,avoidsparallel.Second,I/Oendwiring1.Inputwiring(1)inputsthewiringnottosurpass30metersg
7、enerally.Butiftheenvironmentdisturbanceissmall,whenthelossofvoltageisnotbig,theinputwiringmaysuitablelong.(2)Inputs/theoutputlinenottobeabletousetheidenticalrootelectriccable,theinput/outputlinetobeseparated.(3)Usesthenormallyopenedcontactformtoconnec
8、ttheinputendasfaraspossible,causestheestablishmentthetrapezoidalcharttobeconsistentwiththerelayschematicdiagram,isadvantageousforreading.2.Outgoingjunction(1)Theout-putwiringdividesintotheindependentoutputandthepublicoutput.Innotgroup,mayuseth
