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欧洲的PLC**厂商，西门子A&D和施耐德电气，都能提供功能强大的控制器系列，不管是PLC还是工业PC，并同时促进了PLC和工业PC领域的发展。
西门子近期宣布S7-400 PLC系列的重大性能提升，现在的性能是以前的3倍，通信能力是以前的2倍。
西门子还在其的S7-400系列中增加了另一个创新：通信处理器，具有集成的、4端口的Ethernet switch。不需要外部switch，是能用于小型以太网通信的经济型模式。但是，这种通信处理器真正的不同之处在于它是一个从现在向更高阶段发展的中间级，在更高阶段中，西门子将采用PLC和集成Profinet V3 switch的外部设备，能提供实时控制。
施耐德电气已经大幅度的发展了的性能，采用新的Unity编程软件，XML数据形式。在嵌入了web server和多通信口后，新的在功能上越来越像PC。
集成的平台设计
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