【作者】 赵斌；

【导师】 金建祥； 王为民；

【作者基本信息】 浙江大学 ， 检测技术与自动化装置， 2008， 硕士

【摘要】 现场总线技术适应了工业控制系统分散化、网络化、智能化的发展方向,成为全球工业自动化技术的热点,取得了快速发展。然而,自20世纪80年代以来,这一技术一直掌握在一些著名跨国公司手中,一直垄断着中国现场总线技术和产品市场。“自动控制技术控制着几乎所有的工业生产领域,事关整个国民经济的正常运行,如果不自主研发,中国将永远受制于人。”工业以太网EPA(Ethernet for Plant Automation)标准是我国第一个拥有自主知识产权的现场总线标准,也是我国迄今为止首个被国际标准化组织接收和发布的工业自动化标准,实现了我国工业自动化领域国际标准零的突破。EPA控制网络将是未来工业控制系统的发展方向,但是我国的EPA标准刚刚起步,而当前自动化智能仪表一般都不支持EPA通信,所以研究如何将这些不支持EPA通信的仪表应用于EPA控制网络中对于扩大EPA应用领域、提高EPA应用规模具有重要的现实意义。本课题的研究为如何实现这些智能仪表应用于EPA控制网络提出了一种通用解决方案。本文以浙江中控自动化仪表有限公司生产的C3000智能过程控制器为研究对象,开发了相应的EPA接口卡及监控软件。同时,为了满足智能仪表可扩充性的要求,突破性地采用可编程逻辑器件CPLD配合RAM来实现仪表主机板和EPA卡之间的内部数据交换。配备了此接口卡的C3000过程控制器可以直接应用于EPA控制网络,同时上位机可以通过监控软件对其执行相应的监控操作。此接口卡只需经过少量的改动便可以适用于其他智能仪表,大大缩短了针对其他仪表的EPA接口卡开发周期,加快推广了EPA标准的应用。论文主要完成了以下工作:(1)详细综述了现场总线、智能仪表的发展及现状,并提出了针对智能仪表的EPA接口的设计与开发。(2)简要概括了EPA标准中与本课题相关的一些内容,同时对EPA标准中的各类服务进行了深入的研究,结合已成功开发的C3000过程控制器,分析了本课题中EPA接口卡的具体功能需求。(3)针对EPA接口卡的软、硬件设计进行了深入而细致的分析和阐述。在阐述EPA接口卡功能的基础上,详细比较了各种实现方式的优缺点,最终确立了设计方案。详细分析了EPA接口卡中各部分电路的实现方法,同时指出了设计中需要注意的问题;详细分析了EPA接口卡各功能的软件实现方法,并给出了软件设计流程。软件设计中的难点是各个任务之间的相应协调。(4)分析了EPA接口卡的一些特殊功能,在VC++环境下设计开发了相应的监控软件对这些功能进行测试。深入研究了Windows下的网络编程,比较了各种实现方式的优缺点,确立了最终实现方案。针对EPA接口卡的功能,详细分析了软件功能及实现方法,并给出了软件设计流程。(5)描述了EPA接口卡、监控软件功能测试方法,并对测试结果进行了分析。测试结果表明配备了此接口卡的C3000过程控制器可以应用于EPA控制网络;监控软件与接口卡的通信稳定可靠。论文中所述方法是可行的,EPA接口卡、监控软件的开发是成功的。更多还原

【Abstract】 In accord with the developing tendency of industrial control system, the fieldbus technology become very popular in automation field, and has grown rapidly. But since the 1980s, this technology has been held in the hands of some well-known multinational companies and monopoly of the Chinese fieldbus technology and products market.The EPA (Ethernet for Plant Automation) standard is the first fieldbus standard, which IP (Intellectual Property) belongs to our country entirely. Further more, it is embodied by IEC61158 (Edition 4) formally. It’s an international standard admitted by IEC. EPA control network will be the future industrial development direction of the control system, but the EPA standards in China has just started, and the current intelligent instruments generally do not support the EPA communications. so how to make these instruments used in the EPA control network has important practical significance. The paper achieves a common solution of how to apply intelligent instrument in the EPA control network.This paper designes a EPA interface and Monitor routine that based on the C3000 process controller which has been developed successfully by SUPCON INSTRUMENT. To meet the demand of instrument extensibility, CPLD, together with RAM, was originally used to communicate internal data between the main board of instruments and EPA interface. The EPA interface will equip C3000 process controller the communication capacity based on EPA. Monitor routine equip us to operate the C3000 process controller through the computer. I accomplished the following works.(1) The actuality and trend of the fieldbus and the intelligent instrument are described, the design and development of EPA interface based on intelligent instrument is presented.(2) Contents with reference to the design in EPA standard are described, types of service are researched, associated to the C3000 process controller, the detail functions of EPA interface are analyzed.(3) The in-depth and fine analysis and expatiation of the software and hardware design of EPA interface are introduced in the paper. Based on the requirements of current industrial instruments design, many low power consumption and reliability design methods are adopted synthetically. Based on the description of EPA interface and the comparison of many methods, the blue print is established.(4) Based on the analysis of functions of EPA interface, Monitor routine is developed in Visual C++ to test these functions. Based on the in-depth analysis of Network program in Windows and comparison of many methods, the blue print is established. Functions and realize methods are analyzed based on the function of EPA interface; the flow chart of software design is presented. Methods to describe the EPA device are researched, functions of each block are analyzed deeply.(5) Methods to test the function of EPA interface and Monitor routine are introduced; the results of test are analyzed. The test showed that the C3000 process controller equipped with EPA interface can work in EPA control network well; the communication between EPA interface and Monitor routine is stable and reliable.The methods presented in the dissertation are reliable; the developments of EPA interface and Monitor routine are successful.更多还原