1764-MM1
1764-MM1
1764-MM1
3 、正确选择接地点，完善接地系统
良好的接地是保证PLC可靠工作的重要条件，可以避免偶然发生的电压冲击危害。接地的目的通常有两个，其一为了安全，其二是为了抑制干扰。完善的接地系统是PLC控制系统抗电磁干扰的重要措施。在PLC控制系统中，具有多种形式的“接地”，主要有：
（1）信号地。输入端信号元件的地；
（2）交流地。交流供电电源的N线；
（3）屏蔽地。为防止静电和磁场感应而设置的外壳或金属丝网，通过专门的铜导线将其接入地下；
（4）保护地。将机器设备的外壳或设备内独立器件的外壳接地，用于保护人身安全和防止设备漏电。
为了抑制附加在电源及输入、输出端的干扰，应对PLC系统进行良好的接地。一般情况下，接地方式与信号频率有关，当频率低于1MHz时，可用一点接地；高于10MHz时，采用多点接地；在1～10MH之间时，通常情况下，PLC控制系统采用一点接地，将所有地线端子和近接地点相连接，以获得好的抗干扰能力。接地线截面积不能小于2mm2，接地电阻不能大于100Ω，接地线使用地线。
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