【作者】 张文佳；

【导师】 赵永生；

【作者基本信息】 大连海事大学 ， 控制理论与控制工程， 2006， 硕士

【摘要】 嵌入式系统是继网络技术之后,又一个新兴的技术发展方向。嵌入式系统具有体积小、性能强、功耗低、可靠性高以及面向行业应用的突出特征,目前已经广泛地应用于军事国防、消费电子、网络通信、工业控制等各个领域。 Linux属于开放的操作系统,它对新技术,新协议有良好的适应性,而且具有强大的网络功能。因为它的开放源代码、免费和内核可裁剪等优点,在嵌入式系统中的应用越来越广泛。 嵌入式系统应用需求中最为突出的一个特点是注重应用的时效性,因此,采用成熟、易于二次开发的系统有利于节省时间,从而以最短的时间面向用户。 因此本文的目标就是设计并实现一个Linux平台下的组态的嵌入式底层工业控制软件,用于对常规工业过程的控制。本系统可针对不同的具体工业项目自由组态,满足用户不同的需求,从而大大节省项目的开发时间,为用户争取项目市场提供帮助。 文中对嵌入式系统的定义、特点、分类和发展进行了阐述,并且对当前比较典型的嵌入式操作系统作了分析;对嵌入式工业控制系统的需求作了深入研究,选择技术成熟的PC104嵌入式系统作为系统的硬件平台,Linux操作系统作为系统的软件平台;在对控制系统的功能进行分析的基础上,进行了系统软件的总体设计,主要包括软件功能、数据结构、存储方式和模块划分等;本文设计并实现了基于以太网的ModbusTcp协议,实现了系统的网络通讯功能,使得系统可以与其他支持该协议的组态软件连接,实现分布式网络控制:系统中还利用ModbusTcp协议中为用户保留的功能码,实现了系统参数设定和下载的功能。论文采用了多种Linux的编程技术例如多线程技术等,所实现的系统功能完善,组态灵活,具有通用性。 本文研究的嵌入式底层工业控制系统软件有着广泛的应用领域,通过组态,可用于各种类型的工业控制对象和系统,并且通过简单移植即可应用于不同的硬件平台。本系统的研究和开发具有较高的实用价值。更多还原

【Abstract】 Embedded system is new technological developing direction after the network technology. Because of its outstanding characteristics of small size, high performance, low cost, high reliability and well practicality, it has been applied in many fields such as military, electronics, communication, industrial control etc.As an open operating system, Linux can well adapt with the new technology and protocol, further more, Linux have Powerful network functions. Linux operation system-becomes more and more important in embedded system because of its open-resource, free and flexibility.In an embedded system application, the most prominent feature is a focus on the time. Therefore, the use of the system,can save time.So the goal of this thesis is to design and realize an Embedded industrial control software, which is based on the Linux and can be configured, for the industrial process control. The system may respond to specific industrial projects by configuration to meet different user’s need.In this paper, the author first discusses the definition, characteristic, classification and development of embedded system, and introduces the typical embedded operating system. Then the demand for an embedded industrial control system is researched and the software and hardware platform are choosed. Thirdly, with the programming technology of Linux, the software functions, data structure, storage methods and function modules are designed. Furthermore. ModbusTcp arc realized on the net. Finally an embedded industrial control system software is realized in which several programming technology of linux are applied .The system studied in this paper has extensive application fields, and the cost of a whole set of system is very low. So the researching and developing of this kinds of system has a high practical value.更多还原