OPC数据访问服务器的开发研究及实现

发布时间：2018-07-25 06:57

【摘要】：随着计算机技术的不断发展，，应用于工业控制领域的软件与硬件设备的种类也越来越丰富，系统集成变得越来越复杂与困难。所以，无论是对于客户还是开发者而言，一套统一、通用的标准是非常必要的。 OPC DA主要是提供现场层和应用软件间的纵向的数据集成和互操作。OPC客户端能通过标准接口与一个或多个不同提供商的服务器通信。OPC DX由于定义了一个通用的接口，使得不同总线协议的设备和控制器通过以太网进行直接数据交换成为可能从OPC技术的应用和开发来看，OPC DA数据访问规范是核心，在工业控制系统的实际应用也最广泛，应用软件中OPC DA几乎成了必须的接口标准。基于工业以太网的控制系统己经成为比较流行的趋势，而且OPC DA就做为一种开放的软件技术在系统的集成中获得应用。本论文首先论述了OPC技术的产生背景及其意义，分析了OPC数据存取规范；对OPC技术的核心一一COM技术的实现过程及编程方法进行了详细的剖析，并描述delphi中开发COm的组件的过程。本论文的重点是开发OPC数据访问服务器。因此本论文设计了OPC服务器的结构，解决了开发中的难点，结合第三方开源propckit库，用delphi实现了OPC服务器的基本功能，最后对OPC服务器的测试给出了详细方法。本论文主要做了以下几个方面的贡献：一是认真研究OPC的执行标准与技术细节，掌握OPC的相关技术关键二是研究开源类库propckit，以TOPCItemServer为基类封装出RttiItemServer类。将OPC的item转化为一个类的属性，大大简化的OPC的开发，并以此提出了OPC的通用开发方法。三是提出了OPC技术与数据库系统相结合的技术结构和细节，以及数据库建立方法。四是提出了OPC数据监控系统的总体结构五是以delhi编程的方法测试OPC服务器
[Abstract]:With the development of computer technology, the types of software and hardware used in industrial control field are more and more abundant, and the system integration becomes more and more complex and difficult. So, for both the client and the developer, A common standard is very necessary. OPC DA is primarily designed to provide vertical data integration and interoperability between the field layer and the application. OPC clients can connect with servers of one or more different providers through the standard interface Communication. OPC DX defines a common interface, It makes it possible for devices and controllers of different bus protocols to exchange data directly through Ethernet. From the point of view of the application and development of OPC technology, OPCDA data access specification is the core. It is widely used in industrial control system, and OPC DA has almost become the necessary interface standard in the application software. Industrial Ethernet based control system has become a popular trend, and OPC DA as an open software technology has been applied in system integration. This paper first discusses the background and significance of OPC technology, analyzes the OPC data access specification, analyzes the implementation process and programming method of COM technology, which is the core of OPC technology. The process of developing components of COm in delphi is described. The emphasis of this paper is to develop OPC data access server. Therefore, this paper designs the structure of OPC server, solves the difficulties in the development, combines with the third party open source propckit library, realizes the basic function of OPC server with delphi, and finally gives the detailed method to test the OPC server. The main contributions of this paper are as follows: first, we study the implementation standards and technical details of OPC, and the key to master the relevant technology of OPC is to study the open source class library propckit, and encapsulate the RttiItemServer class with TOPCItemServer as the base class. The item of OPC is transformed into the attribute of a class, which greatly simplifies the development of OPC. Based on this, the general development method of OPC is put forward. Third, the technical structure and details of combining OPC technology with database system, and the method of database establishment are put forward. Finally, the overall structure of OPC data monitoring system is put forward. Fifth, OPC server is tested by delhi programming method.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP368.5

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