KL2622模块

KL2622模块

通常从电源与接地保护、接线安排 屏蔽和抗噪声等4个方面着手考虑

PART1、电源与接地保护

PLC本身的抗干扰能力一般都很强。通常.将PLC的电源与系统的动力设备电源分开配线 对于电源线来的干扰，一般都有足够强的抑制能力。

但是电源干扰特别严重，可加接一个带屏蔽层的隔离变压器以减少设备与地之间的干扰，提高系统的可靠性。如果一个系统中含有扩展单元，则其电源与基本单元共用一个开关控制，也就是说，它们的上电与断电同时进行。

为了抑制附加在电源及输入端、输出端的干扰，应给PLC接地线 接地线线径要足够粗.接地电阻要小于4Ω，接地点应尽可能靠近PLC，并且接地点要与其它设备分开。对供电系统中的强电设备，其外壳、柜体、框架、机座及操作手柄等金属构件保护接地。

PLC内部电路包括CPU、存储器和其他接口共接数字地，外部电路包括A/D、D/A 等共接模拟地并用粗短的铜线将PLC底板与中央接地点星形联结防哚声干扰。PLC非接地工作时，应将PLC的安装支架容性接地以抑制电磁干扰。

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