IC647NMX000正品;
IC647NMX000正品;
IC647NMX000正品


　(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***各类信号之外，总会有外部干扰信号侵入。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

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DANFOSS 175L3216 NSPP 175L3216
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ASEA BROWN BOVERI 57088478 NSFP 57088478
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SIEMENS 6RB2-000-0GB01 USPP 6RB20000GB01
PITNEY BOWES 5120 NSFP 5120
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Panasonic AC Servo Driver MSD011A1XX w/ 60 day warranty
ASEA BROWN BOVERI 57510001-AA/5 USPP 57510001AA5
PERCEPTRON 911-0018 USPP 9110018
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TELEMECANIQUE TSX-MEM42 USPP TSXMEM42
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TEXAS INSTRUMENTS VPU500-3104 VIDEO PROGRAMMING UNIT
Texas Instruments 500-2114 Remote Base Controller
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GORMAN RUPP 27781-035 USPP 27781035
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Panasonic AC Servo MQDB012AAD 100W & Motor MQMA012A3F
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Perceptron 916-4128 Digital Contour Sensor Camera
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500-5056 Texas Instruments Siemens TI 32 pt output module 5005056 N170
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TEXAS INSTRUMENTS PLC 505-4632 USPP 5054632
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KEYENCE CORP PI-C92 NSFP PIC92
ASEA BROWN BOVERI 48990001-FK/2 USPP 48990001FK2
Panasonic MSM042A2UE AC Servo Motor
PROCESS CONTROL CORP C1247 USPP C1247
PERCEPTRON 911-0018 USPP 9110018
PERCEPTRON DIGITAL 3 TRICAM 917-4008 LASER DIGITAL SURFACE SENSOR
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TEXAS INSTRUMENTS 530C-1108 530C1108 SIEMANS MODULE
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TEXAS INSTRUMENTS 500-5056 **
Panasonic AC SERVO MOTOR MSMA082A1G Free Ship
Texas Instruments PM550-416 Loop Access Module
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