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1、PLCCharacteristicPLCEnglishfulltitleProgrammableLogicController,Chinesefulltitleastheprogrammablelogicalcontroller,thedefinitionis:Onekindofdigitaloperationoperation'selectronicsystem,fordesignsspeciallyintheindustryenvironmentapplication.Itusesakindofprogrammablememory,usesinitsinternallystoredpr
2、ogram,theactuatinglogicoperation,thesequentialcontrol,fixedtime,countingandarithmeticoperationandsoonfaceuser'sinstruction,andthroughdigitaleithersimulationtypeinput/outputcontroleachtypemachineryorproductionprocess.PLCcharacteristic:2.1reliabilityishigh,antijammingability.dependingonthenatureisth
3、eelectriccontrolequipment'sessentialperformance.BecausePLCusesthemodernlargescaleintegratedcircuittechnology,usedthestricttechniqueofproductionmanufacture,theinternalcircuithasadoptedtheadvancedantijammingtechnology,hadtheveryhighreliability.ForexampletheMitsubishiCorporationproducesFseriesPLCmean
4、timebetweenfailurereachesashighasfor300,000hours.SomeuseredundancyCPUPLCaveragetrouble-freeoperatingtimeislonger.FromthePLCoutsidetheaircraftelectriccircuit,usesthePLCconstitutioncontrolsystem,compareswiththesamelevelscalefollowingtheelectricalpick-offsystem,theelectricalwiringandtheswitchcontactr
5、educedtoseveralhundredsevenseveralthousands1,thebreakdownalsogreatlyreduces.Inaddition,PLChasthehardwarefaultself-measuringability,presentswhenthebreakdownmaysendoutthewarninginformationpromptly.Intheapplicationsoftware,theapplicationmayalsoenrolltheperipherycomponent'sbreakdownfromthediagnosticpr
6、ogram,causesinthesystemalsoobtainsthebreakdownbesidesthePLCelectriccircuitandtheequipmentfromthediagnosisprotection.Thus,theoverallsystemhastheextremelyhighreliabilityalsonottofeelstrange.2.2necessarycomplete,thefunctionisperfect,serviceable.PLCdevelopstoday,hadalreadyformedthelarge,mediumandsmall
7、eachscaleserializedproduct.Mayuseineachscaletheindustrialcontrolsituation.Besidesthelogicalprocessingfunction,modernPLCmostlyhastheconsummationdataoperationability,mayuseineachkindofnumericalcontroldomain.Inrecen
