1783-MS06T

1783-MS06T

1783-MS06T

1783-MS06T

 3.PLC主要抗干扰措施

    (1)电源的合理处理，***电网引入的干扰对于电源引入的电网干扰可以安装一台带屏蔽层的变比为1：1的隔离变压器，以减少设备与地之间的干扰，还可以在电源输入端串接LC滤波电路。

    (2)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***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之一。

    PLC控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均，(来源：http://www.dqjsw.com.cn）不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。例如电缆屏蔽层必须一点接地，如果电缆屏蔽层两端A，B都接地，就存在地电位差，有电流流过屏蔽层，当发生异常状态如雷击时，地线电流将更大。

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