简介:多年来,可编程逻辑控制器(PLC)为OEM厂商和最终用户提供了高可靠性控制系统。然而,为实现越来越多的功能和不断提高网络通信性能,PLC工程师们不得不考虑进行系统硬/软件的更新换代,不断进行硬/软件的重新设计。现在,一种全新概念的控制系统,可编程自动化控制器(PAC)的出现,提高了控制系统的灵活性、开放性和整体性能。PAC可使客户无需重新设计整个系统,就可不断获得递升的系统性能。在PAC操作系统上设计了一个通用、适合于多平台(包括硬件平台和操作系统平台)、便于移植用户应用程序、轻便的控制引擎,这样保证使用PAC系统的用户可使其编制的应用程序获得较大应用收益,且还能不断优化其自动化平台。通过本文,可以使大家对PAC有一个初步认识。
简介:摘要本设计以单片机AT89C52为核心芯片,从电网中检测到和功率因数相关的参数(电压、电流、有功功率)送到主控单元,CPU计算出功率因数,将其和功率因数上下限比较,发出投切电容器的命令。本设计的装置能够实时显示电压、电流、功率因数、投切电容组等状态,并有报警、闭锁功能。同时用户可根据需要设定功率因数上、下限,过电压值等参数。在单片机与上位机的通讯中,采用了RS—485总线标准,上位机可实时监控功率因数等状态。
简介:A10mW,4GHzCMOSPhase-LockedLoopwithDual-ModeTuningTechniqueandPartly-lntegratedLoopFilter;Aclean,quiet,environmentallyfriendlysnowmobile;Acomputer-controllersystemforstudyingthethermodesorptionofdeuterium;AcontrolofvehicleusingSteer-by-WiresystemwithHardware-In-the-Loop-Simulationsystem;AcorrdinatcdcontrolofSTATCOMtoimprovevoltagestability;ADesignofReflection-TypePolarizationControlDeviceUsingFerroelectricLiquidCrystals;
简介:Aremotesupervisorysystemforapowersystemprotectionandcontrolunitapplyingmobileagenttechnology,Aruggedandintelligentradiationmonitoringinstrumentforthebattletanks,Asecond-ordersemi-digitalclockrecoverycircuitbasedoninjectionlocking,ASingleClockCycleMIPSRISCProcessorDesignusingVHDL,Astudyonelectrochemicalmicromachiningforfabricationofmicrogroovesinanair-lubricatedhydrodynamicbearing,Astudyonhydrauliccontrolofafrictionbrakeforrailwayrollingstock(Istreport,adevelopmentofapoppettypebrakepressurecontrolvalve),Activecontrolofabladeflutterbymeansofacousticexcitation(lstreport,thecaseoflowfrequencyvibrationandsettingsoundsourceinparallelwithabladesurface)。
简介:AFlexibleMultivariableExperimentalAirTankSystemforProcessControlEducation,AGeneralFrameworkforTrackingObjectsinaMulti-CameraEnvironment,AHIGHLYSCALABLE3DCHIPFORBINARYNEURALNETWORKCLASSIFICATIONAPPLICATIONS,AMulti-InstitutionalInterdisciplinaryDistanceControlsExperiment;BringingEngineeringandEngineeringTechnologyStudentsTogether.