1794-OM81794-OM81794-OM8输入刷新--再运行用户程序--再输出刷新--再输入刷新--再运行用户程序--再输出刷新……永不停止地循环反复地进行着。图1.1所示的流程图反映的就是上述过程。它也反映了信息的时间关系。有了上述过程，用PLC实现控制显然是可能的。因为：有了输入刷新，可把输入电路监控得到的输入信息存入PLC的输入映射区；经运行用户程序，输出映射区将得到变换后的信息；再经输出刷新，输出锁存器将反映输出映射区的状态，并通过输出电路产生相应的输出。又由于这个过程是永不停止地循环反复地进行着，所以，输出总是反映输入的变化的。只是响应的时间上，略有滞后。当然，这个滞后不宜太大，否则，所实现的控制不那么及时，也就失去控制的意义。为此，PLC的工作速度要快。速度快、执行指令时间短，是PLC实现控制的基础。事实上，它的速度是很快的，执行一条指令，多的几微秒、几十微秒，少的才零点几，或零点零几微秒。而且这个速度还在不断提高中。图1.1所示的过程是简化的过程，实际的PLC工作过程还要复杂些。除了I/O刷新及运行用户程序，还要做些公共处理工作。【***】【诚信】【创新】【合作】【共赢】厦门泰尼电气有限公司【产品质量】原装进口***【检测标准】按原厂标准【产品质保】1年【快递时间】24小时到【联系我们】＆业务经理：小黄＆洽谈电话：0592-6809319/18950191386＆商务***：2917675397＆传真（FAX)：0592-6890859（请注明，01006收）＆公司全称：厦门泰尼电气有限公司＆公司地址：厦门市海沧区海沧街道滨湖一里1号楼PictureTelBusinessConferenceCameraSystemSS740/760CompaqRaidArraySCSIControllerCard007912-001ECSCompositesProtectiveTr***elHardCase37"x23"x20​"ECSCompositesMilitaryGradeHardCase37"x23"x20​"ECSCompositesDJMusicTouringHardCase37"x23"x20​"ECSCompositesPelicanA/VVideoHardCase37"x23"x20​"ZymarkCappingStationZ410Z410AAscoRed-HatSolenoidValveCoil103-833-1-​DNEWLeyboldThermovacTran***itte​rTTR211STellabsIntelligen​tCSUCard81-4140***ayaLucentAT&TAnalogLineTN746BV6106361421***ayaLucentAT&TAnalogLineTN746BV10106361421AdvancedRadiationShortArcLamp350WHg59V5.9ANEWAdvancedRadiationShortArcLamp350WHg59V3.4ANEW***ayaLucentAT&TAnalogLineTN746BV19106361421NihonKohdenMedicalGradeTransforme​rUPCT-52STBSystemsVideoCardPCI1X0-0271-3​07***ayaLucentAT&TAnalogLineTN746BV16106361421GurleyPrecisionEncoder8125S-0409​6P-5P01-A1​8TQ-06EN***ayaLucentAT&TAnalogLineTN746BV8106361421***ayaLucentAT&TAnalogLineTN746BV9106361421MDC5-WayCrossStainlessSteelNW25K100-5726001NEWVarianSampleDispenserforGraphiteTubeAtomizerTreeBattery-Po​weredPostalScale75LbSPSSeries***ayaLucentAT&TDefinityAnalogLineTN746BV7BlackBoxOpto-Isola​torSP400A-R2HitachiCableOpticalTransponde​rHTR8802A/H​SRacalMilgoDatacrypto​r6464CR1002A40CRHuntingtonFlatAluminumGasketsGA-1000(10X)NEWCisco7000SeriesPowerSupply1200W34-0667-01OlympusHighResolutionColorVideoMonitor14"OEV143MDCBlankFlangeCF8"130030F800000TNEW***ayaAT&TDefinityTelecomSwitchNodeINTFTN573V14ToshibaCD-ROMDrive50PinSCSI40XXM-6401BEatonExideCircuitBoardBypassControl101073070-​001***adefIndustrialTransforme​rMMC-12704-​AS848097861TriplettVeecoThermocoup​leGaugeControlTR/320-GLNEWSunMicroExternalSCSIDDS4TapeDrive599-2350-0​1Cisco2600SeriesRouter2650XMWIC-1B-U47-13900-0​2***ayaLucentAT&TDefinityCoTrunkTN747BV3AscoRed-HatSolenoidValveCoil103-832-1-​DNEW***ayaLucentAT&TDefinityCoTrunkTN747BV8VeecoLa***abelPowerInterconne​ctCable039176107SharpLCDScreenAssembly8.4"LQ9D03B84G5657NEWMitsubishiMelcardSRAMPCMCIACard2MBMF32M1-LCD​AT01***ayaLucentAT&TCoTrunkTN747BV4105167266***ayaLucentAT&TCoTrunkTN747BV11105167266LNRCommunicat​i***RFC-BandVCO406013357-​9UNetAppFC9I/OModuleEMA-XF500-​201-G1106-01828***ayaLucentAT&TCoTrunkTN747BV16105167266INTEG.LNA/​DIPLEXRFAssembly204AM04108​-2ATMW***eguideDirectiona​lCoupler75-303-60-​6-660dBGranville-​PhillipsMini-Conve​ctronModule275275801Low-NoiseBlockConverterLNBC-BandCKU2072W***eguide90°E-Bend90°H-BendTwist90°E90°HB81559ApolloW***eguideAssembly12957VINTAGE1989NardaSingle-Dir​ectionCoupler820-960MHzCEL30470PenningvacColdCathodeCable10mPEG050399-606NEWToshibaDigitalCordlessBaseUnitDKTDKT2104-CBSkynetSymbolDCtoDCInverterSBL-425750-14000-0​56TelemodemPowerAudioTransforme​r13148407TF4RX02FBSimpleTechATAFlashCardPCMCIA32MB8500-0031-​001MDISCSIExpress6CDE2-PCiscoArtesynPowerSupply1200W2294500034-0837-01SeagateBaracudaATAIIIIDEHardDrive30GBST330620A***ayaLucentAT&TCoTrunkTN747BV25105167266ATSwitchingPowerSupplyWH-220-6***ayaLucentAT&TCoTrunkTN747BV26105167266***CDeviceNetSerialUnit&ManifoldSQEX121-SDN1NEW***ayaAT&TDefinityTelecomCoTrunkTN747BV12OrientalMotorTorque&GearHead4TK10CGN-A4GN3KLorainElectrolyt​icCapacitor2731-39048000UF40VDCSkystreamSatelliteReceiverMicroEMR-1600S204000EJYBulbWithFiberOpticsAssemblyWD8943-21-​AMDCInsulatorSeal4WireFeedthroug​h0930701NEWNiceSystemsBoardADIF24150A0055-0​2REPAIR***ayaAT&TDefinityTelecomCoTrunkTN747BV11***RemoteControlUnitRM-P110REPAIRARTPersonalProfession​alTubeMicPreampTubeMP***ayaLucentDefinitySysAccess-Mai​ntTN1648BV3***ayaLucentAT&TCoTrunkTN747BV1105167266***ayaLucentAT&TCoTrunkTN747BV24105167266CreativeController​s6100-1201CoaxialCableAdapter5to155570L25StartekActiveHub14-Port299ATREPAIRVeecoGridWireSetRF350RF-350033651302NEW***ayaLucentPagingControllerModulePCMZPM408186039ToshibaDVDPlayerHDMICFXDSD-5980SD-5980SUBogenM-ClassAmplifierM300PARTSMetalFlexBellows0385-430-0​0Rev.ANEWLNRCommunicat​i***RFC-BandVCO406013357-​XR013357***ayaLucentAT&TCoTrunkTN747BV18105167266***ayaLucentAT&TDS1InterfaceTN767EV6SatelliteTran***issi​onSystemsSTSREF/OSCILLMODLorainElectrolyt​icCapacitor2731-39048000MFD40VDCSunSBUSDifferenti​alSCSIControllerAdapter3702443HoneywellAnalogTachometerMotor&Encoder2VM62-020-​5CondorDCPowerSupply225W+24VGPC225-24VeecoAlphaWireInterconne​ctCable039179000PanasonicTelevisionPCBoardHHHHDMITNPA4242NEWI.T.S.Electronic​sLowNoiseAmplifierRFLA-1A545-0​01ParkerSolenoidValve1/2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