MC-4/11/03/400

（5）来自接地系统混乱时的干扰

  接地是提高电子设备电磁兼容性（EMC）的有效手段之一。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，当发生异常状态加雷击时，地线电流将更大。

  此外，屏蔽层、接地线和大地有可能构成闭合环路，在变化磁场的作用下，屏蔽层内有会出现感应电流，通过屏蔽层与芯线之间的耦合，干扰信号回路。若系统地与其它接地处理混乱，所产生的地环流可能在地线上产生不等电位分布，影响PLC内逻辑电路和模拟电路的正常工作。PLC工作的逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存储，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。

 主要经销分散式控制系統(DCS)、可编程控制器(PLC)、工业机器人(配件)、数控系统模块、伺服控制系统组件以及其它工业产品和机电设备。优势品牌:A-B(ROCKWELL)、NATIONAL INSTRUMENTS(NI)、福克斯波罗(FOXBORO)、NI(National Instruments)、艾默生(Emerson)、博世力士乐（BoschRexroth）、罗斯蒙特(Rosemount)、通用(GE)、霍尼韦尔(Honeywell)、瑞恩(Reliance)、西屋(Westinghouse)、Schneider Modicon(施耐德莫迪康)等。同时，我们在很多地方都建立了高效和稳定的供应网络，如：德国，法国，加拿大，美国等地区。我们的产品应用于很多领域，包括设备制造工业，石油化工，动力工业，冶金工业，汽车制造业，航空航天工业……等。

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