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1、PLCQUESTIONPLCwhichshouldpayattentionintheapplicationisspeciallythecontroldevicewhichservesfortheindustrialproduction,usuallydoesnotneedtotakeanymeasure,mayusedirectlyintheindustryenvironment.But,whentheproductionenvironmentistoobad,theelectromagneticinterferenceisspecialintense,orinstal
2、lsusesimproper,cannotguaranteePLCthenormaloperation,thereforeshouldpayattentiontothefollowingquestionintheuse.First,installmentandwiring(1)Thepowerline,thepilotwireaswellasthePLCpowerlineandtheI/Olineshoulddistinguishthewiring,betweentheinsulatingtransformerandPLCandI/Oshouldusethedouble
3、rubberizedwireconnection.(2)PLCshouldbefarawayfromthestrongjammingsourcelikeelectricweldingmachine,thehighefficiencysiliconrectifierunitandthelarge-scalepowerequipment,cannotinstallwiththehigh-pressuredelectricapplianceintheidenticalswitchcabinet.(3)TheinputandoutputofPLCarebestseparatet
4、heline,theswitchquantityandthesimulationquantitymustseparatetheplacing.Thesimulationquantitysignal'stransmissionshouldusetheshieldedwire,theshieldinglayershouldanendorthebothsidesearth,andtheearthresistanceshouldbesmallerthantheshieldinglayerresistance1/10.(4)ThePLCelementalareaandtheexp
5、ansionunitaswellasfunctionalmodule'stiescableshouldliealone,preventstheoutsidesignalthedisturbance.(5)Theexchangeoutputlineandthedirect-currentoutputlinedonotusetheidenticalrootelectriccable,theoutputlinetobefarawayfromthehightensionlineandthepowerlineasfaraspossible,avoidsparallel.Secon
6、d,I/Oendwiring1.Inputwiring(1)inputsthewiringnottosurpass30metersgenerally.Butiftheenvironmentdisturbanceissmall,whenthelossofvoltageisnotbig,theinputwiringmaysuitablelong.(2)Inputs/theoutputlinenottobeabletousetheidenticalrootelectriccable,theinput/outputlinetobeseparated.(3)Usesthenorm
7、allyopenedcontactformtoconnecttheinputendasfaraspossible,causestheestablishmentthetrapezoidalcharttobeconsistentwiththerelayschematicdiagram,isadvantageousforreading.2.Outgoingjunction(1)Theout-putwiringdividesintotheindependentoutputandthepublicoutput.Innotgroup,mayuseth
