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1、QuestionsOfPLCsUsingPLCisonekindofusesintheindustrialproductionautomationcontrolequipment,generallydoesnotneedtotakeanymeasure,maydirectlyuseintheindustryenvironment.However,althoughithasthereliabilitywhichlikeonstateshigh,antijammingabilitystronger,butworksasproductionenvi
2、ronmentistoobad,electromagneticinterferencespeciallyintense,orinstallsusesisimproper,possiblycreatestheprogramerrorortheoperationmistake,thusproducesinputsbymistakeandcausesoutputsbymistake,thiswillbeabletocreatetheequipmentoutofcontrolandthedisoperation,thuswillnotbeableto
3、guaranteePLCthenormaloperation,willhavetoenhancethePLCcontrolsystemreliability,ontheonehandwillrequestPLCtoproducethefactorytoenhancetheequipmenttheantijammingability;ontheotherhand,intherequestdesign,theinstallmentandtheusemaintenancecausehighlytakes,coordinatestobeableine
4、verywaytoconsummatesolvestheproblem,effectivelystrengthensthesystemtheresistancetointerference・Belowthereforeshouldpayattentiontothequestionintheuse:1.WorkingconditionsThetemperaturePLCrequestambienttemperaturewhen0〜55°C,installscannotputunderthecalorificcapacitybigpart,all
5、aroundventilatestheradiationthespacetobesupposedenoughtobebig.ThehumidityInordertoguaranteePLCtheinsulatingability,theairrelativehumidityshouldbesmallerthan85%(nottocongealdew).ThevibrationWeshouldcausePLCtobefarawaytheintensevibrationsource,preventedthevibrationfrequencyis
6、10〜55Hzisfrequentorthevibration.Whenuseenvironmentinevitablevibration,musttaketheabsorptionofshockmeasure,likeusestheabsorptionofshockrubberandsoon.TheairToavoidhavingthecorrosionandtheflammablegas,forexampleHydrogenchloride,hydrogensulfideandsoon.Hasmoredustorthecausticgas
7、environmentregardingtheairin,mayinstallPLCinasealbettercontrolroomorcontrolsinthecabinet.PowersourcePLCthedisturbancewhichbringsregardingthepowerlinehasthecertainresistingability.Isveryhighinthereliablerequestorinthepowersourcedisturbanceespeciallyseriousenvironment,mayinst
8、allabeltshieldleveltheinsulatingtransformer,andreducesbetweentheequipmentandthepla