20095AGRICULTURALEQUIPMENT&VEHICLEENGINEERING20095(214)No.52009(Totally214):2009-03-25:(1961-),,,,:。AGRICULTURALEQUIPMENT&VEHICLEENGINEERING20095(214)No.52009(Totally214)PLC(,253023):,PLC,。,PLC,,PLC,,,、。,。:;;:U491.5+1:A:1673-3142(2009)05-0031-03TheDesignoftheTrafficLightsControlledbyPLCJINXiu-hui(DepartmentofMechanicalandElectronicEngineering,DezhouUniversity,Dezhou253023,China)Abstract:Accordingtotherequirementsofthecrossroadstrafficlightscontrol,thePLCdesignisusedtoachievethesequentialcontrolofthenormaltransportation,throughthesensortocompletetheintelligentdistinctionandprocessingoftheabnormaltrafficconditions.Inthedesignofthesystem,onemethodofintelligentcontrolisusedwhichcombinestheProgrammableLogicalControllerandtheSensor,usestheshaft-typesensortogathervehiclespulseandthehighspeedcounterofthePLCtocountthenumberofthepulse,usescertainprinciplesofintelligentcontroltoadjustthelengthoftrafficlightsautomaticallyaccordingtothedataobtained,reducesthephenomenonofthevehiclesstrandedinalargescale,solvestheproblemsofnotequilibriumandunstabletrafficflowmagnitudewell.Thetheoreticalresultsshowsthatthesystemdesignedcanachievetheanticipatedtarget.Keywords:programmablelogicalcontroller;trafficlights;thesystemofintelligentcontrol,,、、,、。,,(PLC),。,[1]。,:,。,,。、,:,。,,。,,。,,PLC,,、,,,,。,、,,[2]。·31·200952,,,,。,,,、;PLC“”,,,、,PLC,,,,[3]。1。3,PLC[4]。,,,,,,。3.1I/O,FX。2,I/O:(Input):X0;X1;X2();X3();X4(Output):Y000;Y001;Y002;Y003;Y004;Y005;Y006;Y007;COM、3.2,:、,、,、,:,;。3.2.1。SB1,,SB2,。,,。25s,20s,3s,1s(0.5s0.5s),3s,2s,2s,,,。30s,25s,3s,2s,2s,,,,,,3。3.2.2。,,1A/DPLC2X0X1X2X3X4COMY000Y001Y002Y003Y004Y005Y006Y007COMPLCSB1L024V220VSB2SB3SB4SB5L1L2L3L4L5L6L724V·32·200956"=="“?”,“”,【】|【】。2.3【】|【】,【】|【】|【】,,6。3Pro/E,。,1,,,、、,。,。[1],,.[M].:,2007:222-226.[2],.Pro/E.[M].:,2003:125-171.[3].Pro/ENGINEER2001()[M].:,2003:220-247.[5]。,。。,PLC,PLC,。4。4,PLC。,,、,,、。[1].PLC[J].,2005(24).[2],.PLC[J].,2004,21(3).[3],.PLC[J].,2005(2).[4],.PLC[J].,2005(3).[5].PLC[J].,2005(10).320s25s25s3s2s3s2s30s4>?20s3s2s25s25s25s3s2sNY:PLC(30)·33·