1794-APB1794-APB1794-APB（3）来自接地系统混乱时的干扰接地是提高电子设备电磁兼容性（EMC）的有效手段之一。正确的接地，既能***电磁干扰的影响，又能***设备向外发出干扰；而错误的接地，反而会引入严重的干扰信号，使PLC系统将无法正常工作。PLC控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均，不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。例如电缆屏蔽层必须一点接地，如果电缆屏蔽层两端A、B都接地，就存在地电位差，有电流流过屏蔽层，当发生异常状态如雷击时，地线电流将更大。此外，屏蔽层、接地线和大地有可能构成闭合环路，在变化磁场的作用下，屏蔽层内有会出现感应电流，通过屏蔽层与芯线之间的耦合，干扰信号回路。若系统地与其它接地处理混乱，所产生的地环流就可能在地线上产生不等电位分布，影响PLC内逻辑电路和模拟电路的正常工作。PLC工作的逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存贮，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。◆企业名称：厦门泰尼电气有限公司◆主营业务：DCS,PLC◆经营模式：贸易◆贸易地区：***◆联系人：小黄《女士》◆电话：0592-6809319◆手机：18950191386◆***:2917675397◆传真：0592-6890859（备注“01006”收）◆E-mail：2917675397@***.comTYLANGENERALADAPTORRAC227-053667-TylanFC-260MFC,H2,O2,HCl,Cl2,WF6TylanFC-280SMFCMassFlowControl150SCCMFC280S***TYLANFC-280S***NSFPFC280S***TylanFC-261N2,H2,O2Tylan,MachOne+SystemcontrollerLAMResearchTylanMicroCVDControlPCB118730-001NewVALVECONTROLLERTYLANAdapTorrAC-2S06-REFURBISHEDTYLANFC-127VNSPPFC127VTYLANAC-2S12NSPPAC2S12AMATKITARGONBLEEDTYLANMFC9240-05184ITLTYLANGENERAL,MDVX-100B,motordriventhrottlevalveTYLANFC-3926VNSFPFC3926VTYLANFM-3921VNSFPFM3921VTYLANFM-3926VNSFPFM3926VTylan2950MFCLotFC-2950MEP5-4Vuntested500sccmAMATKITARGONBLEEDTYLANMFC9240-03580ITLTylan2900MFCFC-2900M,CF4,He,CF4,CL2,lot'sof4TylanMFCFC-280,PC-580,N2O,N2,NH3,HElotsof4TylanGeneralCMLA-11S0210TorrManometerLam4520TYLANFC-125KZUSPPFC125KZTYLANFM-225KZUSPP***25KZTylan/MilliporeFC-2960MMassFlowControllerNEWTylanGeneralCMLA-210-100TorrManometerwithCert.TYLANMICROCVDCONTROLBD118730-008TYLANGENERAL,ADAPTORRMODELAC-2TYLAN2979MMassFlowControllerFC-2979MEP5-WM,GasO2TYLAN2900MseriesMFClotsof3,andTN2900MFC,USEDTYLANFC-260NSFPFC260TYLANFC-260-5000SCCM​-02USPPFC2605000SCCM02TYLANFC-261-25SLPM-N​2USPPFC26125SLPMN2TYLANFC-260-500SCCM-​N2USPPFC260500SCCMN2TYLANFC-260NSPPFC260TylanMassFlowControllerFC-280***N25SLPM50PSIGNIBTylanMassFlowControllerFC-261VAIR2000SCCM(NIB)TYLANGENERAL,ADAPTORRMODELAC-4,MilliporeAC-4S02TYLANGENERAL,ADAPTORRMODELAC-4,MilliporeAC-4Tylan2950MFCLotFC-2950MEP5-4Vuntested10sccmNewTylanFC-260CO2MassFlowController10SCCMNewTylanFC-260CCL4MassFlowController50SCCMNewTylanFC-260O2MassFlowController500SCCMTYLANFC-260USPPFC260TYLANFC-260-25SCCM-0​2USPPFC26025SCCM02TYLANFC-260KZNSPPFC260KZVACUUMMANOMETERTYLANCMLA-11S02(10Torr)VACUUMMANOMETERTYLANCMLB-21(100Torr)-REFURBISHEDTYLANGENERALCDL-21S06-EMC0-100T0RRRANGE,lotsof3Tylan2950MFCFC-2952M4Vmetal,Co,CHF4,lot'sof2TYLANFC-260-150SCCM-​N2USPPFC260150SCCMN2Tylan2950FC-2950MEP5MFCLot500sccmuntested3MassFlowMeterTylanFM-360,ArgonandAir,untestedTylanGeneralCMLA-21100TORRCAPACITANCEGAUGETylan2900MFCFC-2900M-EP,N2,20SLPM,lot'sof2Tylan2900MFCFC-2900M-EP,O2,20SLPM,lot'sof2TylanFM-360MassFlowControllerMFCFM360500PSIGNEWTYLANFC-260-1SLM-02USPPFC2601SLM02TYLANFC-261-10SLPM-N​2USPPFC26110SLPMN2TYLANFC-260-4SLM-H2USPPFC2604SLMH2NewTylanFC-550SIH4MassFlowControllerTylanGeneralCMS-11S02,0-10TORR,lotsof2TYLANFC-261-10SLPM-0​2USPPFC26110SLPM02TYLANFC-261-10SLM-N2USPPFC26110SLMN2LAMResearchMillipore/TylanMFCVC-4900VRHRefurbishedTylanFC-261MFCMassFlowControllerNH35SLMrefurbTylan2950SeriesMFCLotFC-2950MEP5-4VuntestedTylan2950MFCLotFC-2950MEP5untested500sccmTylan2900MFCFC-2900M-EP,Ar20SLPMlotsof2usedLAMResearchMillipore/TylanMFCVC-4900VRH-newTylan2902VTMassFlowControllerH210SLPTylansourceVIvaporizercontroller10SLPMH2TylansourceVIvaporizercontrollerSICL420GR/mnTylanGeneralCMLA-21PressureSensor0-100TORRTylanFC202MassFlowControlandPowerSupply-LEDTylanFC-202MassFlowControl-PowerSupply&FilterTylanCorp.MassFlowControllerModelFC-260TYLANFC-261-4SLPM-H2USPPFC2614SLPMH2TylanGeneral4ChamberController(w/watlow965)-NEWTylanMassFlowControllerFC-280SAKZN2ModelFC-280STylan2900SeriesMassFlowControllerFC-2950M-EPTylan2900SeriesMassFlowControllerFC-2900MEPHCLNEWTYLANSOURCEVVAPORIZERCONTROLLER5SLPMH210GR/TYLANFC-261-4SLM-H2USPPFC2614SLMH2TylanMassFlowControlandPowerSupply-FC202TylanGeneralFC-260MFC500ccN2nitrogenMilliporeOne-dayshipping***ailableMASSFLOWCONTROLLERTYLANFC260Gas:SiH4/N2Range:6SLMMASSFLOWCONTROLLERTYLANFC-261Gas:N2Range:7SLMMASSFLOWCONTROLLERTYLANFC280Gas:H2Range:100SccmMASSFLOWCONTROLLERTYLANFC280Gas:H2Range:3SLMMASSFLOWCONTROLLERTYLANFC-261Gas:O2Range:15SLMMASSFLOWCONTROLLERTYLANFC280Gas:H2Range:300SccmMASSFLOWCONTROLLERTYLANFC2900MGas:HeRange:20Sccm2usedTylanFC-260MFC,N2100SCCM,4SLPMTYLANFM-360USPPFM360Tylan/Millipore:MDVX-100BS01BodyThrottleValveTylanDFS-80DigitalFlowStandardQty10TylanMilliporeFC-2900V2SLPMN2NEWTylanVC-4900VRH500SCCMGas:H2OvaporLAM797-92438TylanVC-4900VRH500sccmH2OVaporremoteelectronics2MFCTylanFC-260,20%HCL/N2500SCCM)