Research On Development Of Communication Software Between Pc And Field Devices In A Computer Control System

In computer control system integrations, there often exist such problems as inconsistency among communication protocols of field devices, incompatibility between field devices, and poor portability and serviceability of system communication software. For this reason, this paper conducts researches in the field of field communication software development by introducing the basic ideas of field bus and OPC technologies, sets up a structural model of field communication software, and presents an field communication software development methodology of high convenience, flexibility and practical value.In order to accommodate the need for continuous updating of existing field devices and ongoing evolvement of software development technologies, this paper will discuss the modular and open architecture of field communication software, analyze in detail the main functions of each field communication software layer and the relationship between layer. Module communication interfaces are defined by dividing eachlayer's key function modules, allowing these function modules to be developed into independent communication component to provide a solid foundation for field communication software integration. According to the field communication software framework proposed in this paper, author completed the development of a suite of field communication software in an actual system environment. With this communication software, integration among a variety of field devices of different communication protocols was implemented.The field communication software I developed shields the discrepancies in all kinds of device communication methods, providing a uniform communication interface for applications. It combines all field devices, databases and applications of the system effectively and efficiently, greatly facilitating the integration of computer control systems. In the meanwhile, it overcomes such shortcomings as closure and inefficient rework, and enables the field communication software development to be completed quickly by means of integrating a broad range of communication component, greatly increasing the serviceability, scalability and reusability. The research on the field communication software in this paper provides an easy and convenient solution to field device compatibility, greatly facilitates computer control system integration and has relatively high academic and practical value.