描述
为了防止电场的干扰,可把信号导线用一层金属网作为屏蔽层包起来,再在其外包一层绝缘层,即可选用金属屏蔽导线作为信号传输导线。屏蔽的目的就是隔断场的耦合,抑制各种场的干扰。但采取屏蔽之后,屏蔽层必须正确接地以减少干扰源与信号导线之间的分布电容,将干扰衰减至最小。
如果屏蔽层是非铁磁性材料,那么对于工频50Hz的磁场无屏蔽效果,可以通过将信号线穿入铁管中,使导线得到磁屏蔽。
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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。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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