Description

INFO-4KP-94161 INDELAG

电缆选择的敖设

为了减少动力电缆辐射电磁干扰，尤其是变频装置馈电电缆。笔者在某工程中，采用了铜带铠装屏蔽电力电缆，从而降低了动力线生产的电磁干扰，该工程投产后了满意的效果。

不同类型的信号分别由不同电缆传输，信号电缆应按传输信号种类分层敖设，严禁用同一电缆的不同导线同时传送动力电源和信号，避免信号线与动力电缆靠行敖设，以减少电磁干扰。

3硬件滤波及软件抗如果措施

信号在接入计算机前，在信号线与地间并接电容，以减少共模干扰；在信号两间加装滤波器可减少差模干扰。

由于电磁干扰的复杂，要根本迎接干扰影响是不可能的，因此在PLC控制系统的软件设计和组态时，还应在软件方面进行抗干扰处理，进一步提高系统的。常用的一些措施：数字滤波和工频整形采样，可有效周期干扰；定时校正参考点电位，并采用动态零点，可有效防止电位漂移；采用冗余技术，设计相应的软件标志位；采用间接跳转，设置软件陷阱等提高软件结构。

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