基于Internet的测控网络设计

本文提出了一种新的基于Internet工业测控网络结构--"M&C网络节点".在该结构的基础上一个规模较大、结构复杂的企业测控网络中的一个厂房或车间的所有测控设备可看作是一个具有强大的通信和控制能力的测控节点--"M&C网络节点".通过采用具有通用性、开放性和可靠性的LonWorks现场总线可以非常方便地将安装在一个工业现场安装在一个相对集中区域的所有现场测控单元都集成成为一个节点.通过使用LonWorks串口适配器,"M&C网络节点"具有对工业现场的各种异型PLC设备的兼容性.同时LonWorks以太网适配器被作为"M&C网络节点"的Internet接口."M&C网络节点"的结构设计及两个通信接口(LonWorks串口适配器和LonWorks以太网适配器)的设计在本文中都有详细论述.

Design of M&C Network based on the Internet

A new industry Internet system structure, "M&C Network Node" is presented and designed to construct an M&C network based on the Internet. The "M&C Network Node" has powerful communication and control abilities referring to the wide and complicate M&C network. By using the largely invisible and highly reliable field bus LonWorks, all the local M&C stations installed in the industrial field are integrated into one "M&C Network Node". For connecting the heterogeneous PLC instruments to the LonWorks network a serial adapter (RS232 standard) is designed. The adapter can be seen as the internal communication interface of the "M&C Network Node".The Ethernet interface of the "M&C Network Node" is realized by an Ethernet adapter, which is also designed. The hardware components and the two kinds communication interfaces of this"M&C Network Node" are described in detail in this paper.