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1、PLCQUESTIONPLCwhichshouldpayattentionintheapplicationisspeciallythecontroldevicewhichservesfortheindustrialproduction,usuallydoesnotneedtotakeanymeasure,mayusedirectlyintheindustryenvironment.But,whentheproductionenvironmentistoobad,theelectromagneticinterferenceisspecialintens
2、e,orinstallsusesimproper,cannotguaranteePLCthenormaloperation,thereforeshouldpayattentiontothefollowingquestionintheuse.First,installmentandwiring(1)Thepowerline,thepilotwireaswellasthePLCpowerlineandtheI/Olineshoulddistinguishthewiring,betweentheinsulatingtransformerandPLCandI
3、/Oshouldusethedoublerubberizedwireconnection.(2)PLCshouldbefarawayfromthestrongjammingsourcelikeelectricweldingmachine,thehighefficiencysiliconrectifierunitandthelarge-scalepowerequipment,cannotinstallwiththehigh-pressuredelectricapplianceintheidenticalswitchcabinet.(3)Theinput
4、andoutputofPLCarebestseparatetheline,theswitchquantityandthesimulationquantitymustseparatetheplacing.Thesimulationquantitysignafstransmissionshouldusetheshieldedwire,theshieldinglayershouldanendorthebothsidesearth,andtheearthresistanceshouldbesmallerthantheshieldinglayerresista
5、nce1/10.(4)ThePLCelementalareaandtheexpansionunitaswellasfunctionalmodule'stiescableshouldliealone,preventstheoutsidesignalthedisturbance.(5)Theexchangeoutputlineandthedirect-currentoutputlinedonotusetheidenticalrootelectriccable,theoutputlinetobefarawayfromthehightensionlinean
6、dthepowerlineasfaraspossible,avoidsparallel.Second,I/Oendwiring1.1nputwiring(1)inputsthewiringnottosurpass30metersgenerally・Butiftheenvironmentdisturbanceissmall,whenthelossofvoltageisnotbig,theinputwiringmaysuitablelong・(2)Inputs/theoutputlinenottobeabletousetheidenticalrootel
7、ectriccable,theinput/outputlinetobeseparated.(3)Usesthenormallyopenedcontactformtoconnecttheinputendasfaraspossible,causestheestablishmentthetrapezoidalcharttobeconsistentwiththerelayschematicdiagram,isadvantageousforreading.2.Outgoingjunction(1)Theout-putwiringdividesintothein
8、dependentoutputandthepublicoutput.Innotgroup,mayusethe
