【作者】 曲生超；

【导师】 李志宏；

【作者基本信息】 武汉理工大学 ， 控制理论与控制工程， 2007， 硕士

【摘要】 桥梁的实时监控对于保证桥梁的安全运行十分重要，然而，由于桥梁的特殊的地理位置，所以事实上工业现场的条件十分恶劣，如果采用人工方式进行监控和维护显然十分不智。本文的任务就是对桥梁的自动化监控系统进行简单的设计，为日后进一步的设计奠定良好的基础。在设计中底层数据采集和控制器件我们选用了带有CAN接口的智能模块以简化设计过程。同时重点介绍了CAN总线接入以太网技术，通过这样的设计以使底层模块与监控PC能够有效的进行通讯。现场总线是面向工业现场底层设备的数字化网络技术，现场总线系统(FCS)具有数字化、智能化、和可互操作等特点，十分符合工业控制现场的各种要求。CAN总线是现场总线的一种，最初诞生于汽车行业，它是一种有效支持分布式控制和实时控制的串行通信网络，具有可靠性、实时性和灵活性高，价格低等特点，被越来越广泛的应用于各种工业现场。而工业以太网以其固有的传输速率高，易于安装和开放性好的特点也正在工业控制领域起到不可忽视的作用。本文重点设计了CAN／Ethernet网关。在设计中首先简单介绍了CAN总线、Ethernet以及TCP／IP协议的特点及发展，并分析了将CAN总线接入以太网的可行性。网关的硬件设计包括：CAN接口的设计和以太网接口的设计。其中CAN接口在硬件上选用Philip公司生产的CAN控制器SJA1000和高速CAN总线收发器TJA1040，以太网接口采用台湾Realtek公司生产的全双工以太网控制器RTL8019AS，微控制器则采用AT89S52 CMOS 8位单片机。从而构建起系统通讯的硬件平台。软件设计包括CAN接口和以太网接口的底层驱动程序的设计，分别包括CAN接口和以太网接口的的初始化程序和发送接收程序，并初步在单片机上实现精简的TCP／IP协议，包括ARP协议、IP协议、ICMP协议和UDP协议。这样通过网关就可能实现CAN控制协议和TCP／IP协议的转换并使得系统在日后的维护和升级中接入Internet成为可能。更多还原

【Abstract】 The real-time monitorial and control system is very important to make the btidge running safely.But because of the special geographical environment of the bridge,in fact ,the condition of the industry scene is very hard.So it’s obviously that it’s not sagacious to monitory and control the bridge with manpower.The mission of this article is to simplely design the bridge automation monitorial and control system inorder to establish a basis for the future design.We adopt the intelligence module sith CAN interface as the bottom data collecting and control equpment in order to make the design progressing simplely.And mainly introduce the techenology of CAN Bus connectted into Ethernet with which can realize the communition between lower devices and the monitorial PC.Field-bus is a digitial network techenology which face to the lower devices of the industry scene. FCS has the character of digital, intellectualized and co-operation, which is quite suit for the requirment of the ndustry scene. As a kind of the Field- bus, CAN bus I come from automobile industry ,with the charater of highly reliable and low priced, being used more and more extensively.And Ethernet is also playing more and more importment role in the industry control field because its highly transmission rate and well open charater.This article mainly design the gateway of CAN/Ethernet.And firstly introduce the development and charater of CAN bus and Ethernet and TCP/IP.And analyse the feasibility of connect the CAN bus and Ethernet.The hardware design of the gateway including the CAN interface and Ethernet interface.And the CAN interface adopts the CAN control chip SJA1000 and the sending and collecting chip TJA1040.The Ethernet interface adopts the Ethernet control chip RTL8019AS.The microcomputer adopts AT89S52.With all of this we can build the hardware platform of the system.The design of the software including the driver program of both the CAN interface and Ethernet interface. And tentatively implement the TCP/IP Protocol in the microcomputer,such as ARP protocol、IP protocol、ICMP protocol、UDP protocol. In this paper,we design the gateway of CAN/Ethernet,including the CAN filed-bus interface and the Ethernet interface and their driver program.Also we implement the TCP/IP Protocol in the microcomputer.At the last,the gateway is used into bridge automation system, thus the lower devices and the monitorial PC can be connected and the data exchange between them can be realized. With this we can realize the conversion of the CAN protocol and TCP/IP protocol,and the system can be connected into internet in the other day if necessary.更多还原