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1、ThesignificanceofPIDcontrolThecurrentlevelofindustrialautomationindustriestomeasurethelevelofmodernizationhasbecomeanimportantsymbol.Meanwhile,thecontrolalsoexperiencedthedevelopmentofthetheoryofclassicalcontroltheory,moderncontroltheoryandintelligentcontroltheoryofthreestages.Intel
2、ligentcontrolisatypicalexampleoffuzzyautomaticwashingmachine.Open-loopcontrolsystemcanbedividedintocontrolsystemsandclosed-loopcontrolsystem.Acontrolsystemincludingcontroller,sensors,transmitters,actuators,inputandoutputinterfaces.Controller'soutputthroughtheoutputinterface,theimple
3、mentingagency,addedtothechargedsystem;controlsystem,theamountcharged,throughsensors,transmitters,senttothecontrollerthroughtheinputinterface.Differentcontrolsystems,sensors,transmitters,actuatorsarenotthesame.Suchaspressurecontrolsystempressuresensortobeused.Electricheatingcontrolsy
4、stemsensorisatemperaturesensor.Atpresent,PIDcontrolandcontrollerorintelligentPIDcontroller(instrument)hasalotofproductshavebeenintheengineeringpracticehasbeenwidelyapplied,thereisawiderangeofPIDcontrollers,themajorcompanieshavedevelopedPIDparameterself-tuningcapabilitiesofintelligen
5、tcontroller(intelligentregulator),whichautomaticallyadjuststhePIDcontrollerparametersareadjustedthroughtheintelligentorself-correction,adaptivealgorithmstoachieve.PIDcontrolareachievedusingpressure,temperature,flow,liquidlevelcontroller,PIDcontrolcanachieveprogrammablecontroller(PLC
6、),alsoallowsPIDcontrolofPCsystems,etc..ProgrammableLogicController(PLC)istousetheclosed-loopPIDcontrolmoduletoachievecontrol,programmablelogiccontroller(PLC)canbeconnecteddirectlywithControlNet,suchasRockwell'sPLC-5andsoon.PIDcontrolfunctionalsoallowsthecontroller,suchasRockwell'sLo
7、gixproductline,whichcanbeconnecteddirectlywithControlNet,usethenetworktoachieveitsremotecontrolfunctions.1,theopen-loopcontrolsystemOpen-loopcontrolsystem(open-loopcontrolsystem)ischargedwiththeobject8output(controlledvariables)onthecontroller(controller)didnotaffecttheoutput.Inthis
8、controlsystem,notde
