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在过去的5年中，PLC的重大变化越来越着眼于"小"的方面：micro和nano PLC的应用不断扩展。现在，微小型的控制器的一般都与般大小，却能实现与10年前的中型控制器相当的功能。
在市场，PLC与工业PC有得一拼，因为工业PC在数据集成和通信能力方面对用户的诱惑力很大。
PC还引入了Ethernet TCP/IP网络和与因特网互连的概念。但是现在，PLC制造商也能宣称，"如果你想要这个，我们也能做到。"
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。
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