IC600BF902控制器IC600BF902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ALLENBRADLEY1336-B007-EJD-​FA2-S1USPP1336B007EJDFA2​S1RAYTHEONB34120-00-02-1USPPB3412000021TexasInstruments500-2151-APowerSupply500-2151(TESTED)BARBERCOLMANMP-9910USPPMP9910ALLENBRADLEY2711-TC1USPP2711TC1BARBERCOLMANA-60010-708USPPA60010708ALLENBRADLEY2706-B43J31USPP2706B43J31TITEXASINSTRUMENTS530-1104CONTROLLERPLCMODULEPanasonicM***D042S1AACServoMotorNIBFreeShipSEIKICOLTDINO-11-10-07-0​3USPPI***1100703YASKAWAELECTRICSGMD-40A6ABSUSPPSGMD40A6ABSASEABROWNBOVERIDSQC-211NSPPDSQC211SQUAREDLAF3640032MV10​27USPPLAF3640032MV10​27ASEABROWNBOVERI3HAB2209-1USPP3HAB22091ALLENBRADLEY150-A35NB-NANSFP150A35NBNAASEABROWNBOVERIYB560103-AC/8USPPYB560103AC8TEXASINSTRUMENTSPLC500-5892NSFP5005892PANASONICSERVODRIVERMEDDT7364L012.5KWTEXASINSTRUMENTSPLCPWB-2461414-00​01USPPPWB24614140001ASEABROWNBOVERI***PS-7738-EUSPP***PS7738ETEXASINSTRUMENTSPLC500-5892USPP5005892PanasonicServoDriver1kWMDD103A1VEFreeShipASEABROWNBOVERIS6NH600BWUSPPS6NH600BWCONTROLTECHNIQUESCDE-150NSFPCDE150SIEMENS6FX1-120-2CA00USPP6FX11202CA00505-6850ATexasInstrumentsSiemensSimaticTI505-6850-AR100SYMAX8020-SCP-401NSFP8020SCP401TEXASINSTRUMENTSPLC505-5432USPP5055432FOXBOROCFT30-1411B2/C​FS30-A1AR0B1NSFPCFT301411B2CFS​30FLUIDPOWERDIVISION07.00CTBHB2AUS​43AC-7.00NSPP0700CTBHB2AUS4​3AASEABROWNBOVERI086363-001NSFP086363001GENERALELECTRICDS3800DMPCUSPPDS3800DMPCBURGMASTER0282028-02ANSFP028202802APanasonicServoDriveADKA500BPFADHworkingOMRONCS1W-SLK21USPPCS1WSLK21TexasInstruments505-6516GEFANUCIC647WMI920USPPIC647WMI920SIEMENS6SC6000-ONA02USPP6SC6000ONA02ELECTROCRAFT9101-1131USPP91011131ASEABROWNBOVERIM3AA-090-L-4NSFPM3AA090L4NACHISC35-BJ2-S-ANSPPSC35BJ2SAALLENBRADLEY2801-YCUSPP2801YCCOMPUMOTOR6K2-NKUSPP6K2NKTEXASINSTRUMENTSPLC100-3101NSFP1003101ASEABROWNBOVERIEH175C-1NSFPEH175C1PanasonicACServoMotorMHMA102P1G1kWTEXASINSTRUMENTSPLC5TI-5011NSFP5TI5011PanasonicACServoM***A152D1C200V3000RPM1.5kW200HzM***A152D1CPERCEPTRON916-3079TRICAMDIGITAL2SENSORNNBASEABROWNBOVERIACS60100206000​B1200900USPPACS60100206000​B1TEXASINSTRUMENTSPLC5TI-5339USPP5TI5339Perceptron495-0294ReplacementCircuitBoardMEASUREX053307-00USPP05330700ASEABROWNBOVERIMSB63800LNSFPMSB63800LSiemensTI530C-1104PLCController530C-1104(AC07)PANASONICM1D043A1XACSERVODRIVERUSEDWORKINGMITSUBISHIA1-71SHCPUUSPPA171SHCPUSIEMENS6FX1-110-0AA02USPP6FX11100AA02SANYODENKIPU0A015-EM61P0​0USPPPU0A015EM61P00PanasonicACServoMotorM***D012G1UNewinBoxFREESHIPASEABROWNBOVERIAPIOS-02USPPAPIOS02TEXASINSTRUMENTSPLC505-5417NSPP5055417OnePanasonicACServoDriverDV85005LDMBSFreeShipPanasonicACServoDriverMSDZ013A1AFreeShipASEABROWNBOVERI58096652USPP58096652TEXASINSTRUMENTSPLC505-4332NSPP5054332TEXASINSTRUMENTSPLC5120-11USPP512011TexasInstruments505-4232POWEROHMRESISTORSPF19R16K4-NCNSPPPF19R16K4NCPANASONICACSERVODRIVEMFDDTB3A2L015.0KWTEXASINSTRUMENTSPLC555-1105USPP5551105RELIANCEELECTRIC1SU44010USPP1SU44010)