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浅谈ontrol system interference and way
。PLC系统控制的正常供电电源均由电网供电。由于电网覆盖范围广，它将受到所有空间电磁干扰，空间的辐射电磁场（EMI）主要是由电力网络、电气设备的暂态过程、雷电、无线电广播、电视、雷达等产生的，通常称为辐射干扰，若PLC系统置于所射频场内，就会收到辐射干扰，而在线路上感应电压。尤其是电网内部的变化，刀开关操作浪涌、大型电力设备起停、交直流传动装置引起的谐波、电网短路暂态冲击等，都通过输电线路传到电源原边。可能造成程序错误或运算错误，从而产生误输入并引起误输出，这将会造成设备的失控和误动作，从而不能保证PLC的正常运行。
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the power of interference. PLC system to control the normal power supply from the power supply. Due to network coverage is wide, it will be all the space electromagnetic interference, space radiation electromagnetic field (EMI) is mainly by the electric power network, the transient process of electrical equipment, lightning, radio, television, radar, etc., often referred to as radiation interference, if the PLC system in the rf field, will receive radiation interference, the online induction voltage on the road. Internal changes, especially the grid knife switch operation surge, large power equipment start-stop, ac/dc transmission caused by harmonics, power grid short-circuit transient impact, etc., through the transmission line to supply the original edge. May cause bugs or operational errors, resulting in a input error and the error output, this will lead to equipment is out of control and false action, which can guarantee the normal operation of the PLC.
。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；二是信号线受空间电磁辐射感应的干扰，由此引起系统故障的情况也很多。
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introduced signal interference. All kinds of signal transmission lines connected to the PLC control system, in addition to all kinds of signal transmission effectively, there will always be invasion of external interference si