1797-CEC

 近年来控制与通讯工程师们致力于新型工业以太网的研究工作，其中有代表性的是FF制定的快速以太网标准，其传输速度为100Mbps。综观工业以太网的研究现状，出现了两个值得注意的发展方向：以太网集线器和具有实时功能的以太网的协议。

a、以太网集线器

    FF将以太网技术加入到H2协议中，并以它作为H2的底层协议，其网络采用星型拓朴结构。

    集线器（HUB）置于网络中心并通过以太网I/O接口挂接现场设备，其中实时现场仪表和普通现场仪表（通过通道组）分别挂接在不同的以太网I/O接口上。以太网I/O接口高速（约100 kHz）扫描所有实时现场仪表和通道组，然后传送数据包到上层控制器。

备货，备货，降降降，火火火，火火火……
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公司名称：厦门泰尼电气有限公司
联系人：小黄（销售代表）
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