最近,关于将以太网用于不同等级控制层的应用方面的讨论很多。以太网在办公室的应用很普遍,以太网常常用于高档控制器的企业网络,因此在控制层以至于某些行业所推荐的在设备层使用以太网似乎是很自然的。目前,使用以太网涉及下列几个方面:低成本,良好的连接性,易于移植到高速网络。要想把以太网用于控制首先需了解以太网的基本知识。1 以太网标准 Recently, there have been many discussions about the use of Ethernet for different levels of control. Ethernet is commonplace in offices, and Ethernet is often used in corporate networks of upscale controllers, so it seems natural to use Ethernet at the device level at the control layer, as recommended by some industries. At present, the use of Ethernet involves the following aspects: low cost, good connectivity, easy portability to high-speed networks. To control Ethernet Ethernet first need to understand the basic knowledge of Ethernet. 1 Ethernet standard