1756-OA8 1756-OA8 1756-OA8

发布时间:2017-10-09

1756-OA8

1756-OA8

1756-OA8

接地是提高电子设备电磁兼容性(EMC)的有效手段。正确的接地,既能抑制电磁干扰的影响,又能抑制设备向外发出干扰;而错误的接地,反而会引入严重的干扰信号,使PLC系统将无法正常工作。

 

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,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AB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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