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1752-L24BBBE

1752-L24BBBE

1752-L24BBBE

2.PLC控制系统中电磁干扰的主要来源有哪些呢?

  1) 来自空间的辐射干扰

  空间的辐射电磁场主要是由电力网络、电气设备的暂态过程、雷电、无线电广播、电视、雷达、高频感应加热设备等产生的,通常称为辐射干扰。其分布极为复杂,若plc系统置于所设频场内,就回收到辐射干扰,其影响主要通过两条路劲,一是直接对PLC内部的辐射,由电路感应产生干扰,而是对PLC通信内网络的辐射,出通信线路的感应引入干扰。辐射干扰与现场设备所产生的电磁干场大小,特别是频率有关,一般通过设置屏蔽电缆和PLC局部屏蔽及高压泻放元件进行保护。

  2) 来自系统外引线的干扰

  主要通过电源和信号线引入,通常称为传导干扰。这种干扰在我国工业现场教严重。

  3) 来自电源的干扰

  实践证明,因电源引入的干扰造成控制系统故障的情况很多,在,工程调式中遇到过,后更换隔离性能较高的PLC电源。问题才能得到解决。



备货,备货,降降降,火火火,火火火……
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