6ES5684-4AA11控制器;6ES5684-4AA11控制器;6ES5684-4AA11控制器(4)来自信号线引入的干扰与PLC控制系统连接的各类信号传输线，除了传输有效的各类信号之外，总会有外部干扰信号***。此干扰主要有两种途径：一是通过变送器或共用信号仪表的供电电源串入的电网干扰，这往往被忽略；二是信号线受空间电磁辐射感应的干扰，即信号线上的外部感应干扰，这是很严重的。由信号引入干扰会引起I/O信号工作异常和测量精度大大降低，严重时将引起元器件损伤。对于隔离性能差的系统，还将导致信号间互相干扰，引起共地系统总线回流，造成逻辑数据变化、误动和死机。PLC控制系统因信号引入干扰造成I/O模件损坏数相当严重，由此引起系统故障的情况也很多。（5）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、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。例如电缆层必须一点接地，如果电缆层两端A、B都接地，就存在地电位差，有电流流过层，当发生异常状态加雷击时，地线电流将更大。此外，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，层内有会出现感应电流，通过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储，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RELIANCEELECTRICP21S3045NSFPP21S3045TEXASINSTRUMENTSPLC545-1104USPP5451104TEXASINSTRUMENTSPLC505-7101USPP5057101FANUCA80L-0001-0273USPPA80L00010273TEXASINSTRUMENTSPLC560-2820USPP5602820HONEYWELLR7510A-1005USPPR7510A1005PanasonicACServoDriverMSDA083A1A/750WASEABROWNBOVERIINNPM-22NSFPINNPM22PanasonicACServoMotor***152A1C1.5kWwithPlugsTEXASINSTRUMENTSPLC5110-10USPP511010SiemensSimaticTI435PLC,crossestoDirectLOGICD4-440,KoyoSU-6BTexasInstruments505-6508PERCEPTRONTRICAMLEDLIGHT923-0010~UsedASEABROWNBOVERI57310001-KD/5USPP57310001KD5TEXASINSTRUMENTS500-5037-AANALOGINPUTMODULENEW5005037APanasonicACServoMQDB012AAD100W&MotorMQMA012A3FRAYTHEONB34120-00-02-1USPPB3412000021TEXASINSTRUMENTSPLC505-5518USPP5055518TEXASINSTRUMENTSPLC505-6830NSFP5056830ASEABROWNBOVERI289B943A30NSFP289B943A30ASEABROWNBOVERI48990001-FK/2USPP48990001FK2PanasonicACServoMotorM***A042A1AFreeShipUSEDPerceptron96KDSPFrameGrabber495-0191RevRTexasInstrument500-5019WordOutputModuleASEABROWNBOVERIACH501-015-2-0​0P2USPPACH501015200P2GENERALELECTRICDS3800HXPA1D1DUSPPDS3800HXPA1D1DTEXASINSTRUMENTSPLC500-5023USPP5005023PanasonicACServoMotorM***A042A1AFreeShipTEXASINSTRUMENTSPLC530-1104USPP5301104TEXASINSTRUMENTS5TI-1034-2SEQUENCERMODULE***XLNT***MODICONP2-984A-816USPPP2984A816ASEABROWNBOVERI57360001-K/10USPP57360001K10PanasonicACServoDriverMSDA041A1A/400WPanasonicACServoMotorMHMD082P1C750WFreeShipTEXASINSTRUMENTSPLC500-6224USPP5006224TEXASINSTRUMENTSPLC505-6208USPP5056208TEXASINSTRUMENTSPLC505-CP1434TFNSPP505CP1434TFRELIANCEELECTRIC0-54339NSPP054339TEXASINSTRUMENTSPLC2497447USPP2497447TEXASINSTRUMENTSPLC305-8ADCNSFP3058ADCBAILEYCONTROLSINLIM-03USPPINLIM03SIEMENS6RB2-000-0GB01USPP6RB20000GB01NEWPANASONICServoMotorMQMA022A1ACNC/ROUTERBALDORBSC-3007-705USPPBSC3007705TEXASINSTRUMENTSPLC7MT-400NSPP7MT400MODICON140-DDI-364-00NSFP140DDI36400505-3716TexasInstruments/Si​emensTI5053716R11PanasonicACServoDriverMDDA303A1AFreeShipFORCECOMPUTERSSYS68K/RR-3USPPSYS68KRR3TEXASINSTRUMENTSPLC6MT2456213USPP6MT2456213TexasInstruments500-5051ThermocoupleModule5005051ASEABROWNBOVERI57360001-HGUSPP57360001HGTEXASINSTRUMENTSPLC530-1104NSFP5301104ExpeditedshippingailablePERCEPTRONDIGITAL3TRICAM917-4007LASERDIGITALSURFACESENSORGEM808204-8603USPP82048603FANUCA16B-1211-0062NSPPA16B12110062TEXASINSTRUMENTSPLC505-3532USPP5053532Panasonic/NaisServoMotorMFDDTB3A2NIB!TexasInstruments500-5047ASEABROWNBOVERI3GAA092302-ASA​G1NSPP3GAA092302ASAG​1MOOG152D423USPP152D423(AS01)MSD043A1XXVPANASONICACSERVODRIVEUSEDWORKINGSQUARED8538-SEG13-V02​SNSFP8538SEG13V02SASEABROWNBOVERI5736045-NUSPP5736045NPanasonicMinasACServoDriverMSD43A1XXMSD023A1XXMSD013A1XX400W60dayswarTEXASINSTRUMENTSPLC335-1NIMNSFP3351NIMASEABROWNBOVERIEH800-C1USPPEH800C1BAUMANN54R-25000NSFP54R25000PanasonicACServoMotorMHMD082P1C750WFreeShipTEXASINSTRUMENTSPLCT***90/101MAUSPPT***90101MAPANASONICMSDA5A3A1AACSERVODRIVERNEWFOXBOROP0400YLNSPPP0400YLASEABROWNBOVERI3HAA2121-2NSPP3HAA21212TEXASINSTRUMENTSPLC545-1103USPP5451103INDRAMATMAC090B-0-PD-1​-B/110-A-0/I01​000USPPMAC090B0PD1B11​0CTEXASINSTRUMENTS500-5005INPUTMODULELOT5005005Returns:Acceptedwithin7days)