描述
在实际应用中,通常将屏蔽和接地结合起来应用,往往能解决大部分的干扰问题。如果将屏蔽层在信号侧与仪表侧均接地,则地电位差会通过屏蔽层形成回路,由于地电阻通常比屏蔽层的电阻小得多,所以在屏蔽层上就会形成电位梯度,并通过屏蔽层与信号导线间的分布电容耦合到信号电路中去,因此屏蔽层也必须一点接地。并且,信号导线屏蔽层接地应与系统接地同侧,如4所示。即当不接地的信号源与接地的二次仪表放大器相连时,屏蔽层应如4a)所示接至放大器的公共端,而当信号源接地、放大器浮地时,屏蔽层应如4b)所示接至信号源公共端。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
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◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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