Design And Implementation Of Fieldbus Data Processing System

Fieldbus is connected to the intelligent field devices and automation systems, all-digital,bi-directional, multi-node communication system. Fieldbus is a single decentralized, digital,intelligent measurement and control device as a network node, using the bus is connected toeach other to exchange information to jointly complete the network of automatic controlfunctions and control systems. Fieldbus technology to solve the problem of transmission ofinformation between the intelligent instrument controller, and the implementation of thecomponents of the industrial field digital communications between the field devices as well assite control equipment and advanced control systems.In1984the International Electrotechnical Commission/International StandardsAssociation (IEC/ISA) begin to develop fieldbus standard fieldbus technology in process ofdevelopment, the struggle of the various national interests of the company, the companieshave launched their respective fieldbus technology, between openness and interoperability isalso difficult to unity, which led to the technical standards has yet to form a unifiedspecification.Fieldbus-oriented industrial floor control as a communication network, its limitations areobvious. First of all, fieldbus can not interconnect with the Internet, not remote informationsharing; Secondly, it is not easy to communicate directly with the host computer system, theexisting bus interface card Ethernet card compared to most of the expensive; Finally,constraints fieldbus technology the fundamental problem of development is no uniform dataprotocol standards, system development difficulties, openness is limited, various fieldbusdeveloped a different architecture and standards, excessive system integration costs fieldbusopen restricted.From the system in terms of the existing field bus control system instrumentation, bustransfer equipment and software systems composed of software systems in accordance withthe system functions can be divided into measurement systems, control systems, managementsystems, data processing and service system of the four components. Among them, the dataprocessing and service systems in the field bus control system is usually deployed with thecontrol system with configuration technology in the industrial bus network is running, thesystem real-time data acquisition, data processing and calculation. In addition, two-wayinformation exchange between the data processing system is responsible for automationcontrol network and computer, breaking the closed industrial bus network and the corporateoffice network.To solve the above problem, the paper work into the system program, outline design and detailed design of the three stages. For network traffic data in the systems analysis phase,concurrent processing, the data protocol analysis and application systems, business supportproblem analysis and discussion of network communication technology, data concurrencyissues, the use of protocol version management and intermediate data format forcommunication protocol parsing, the data processing system uses a publish/subscribemechanism to other systems for data dissemination; system outline design stage, according tothe system’s overall building program, the system uses the communication layer, logic layerand application layer composed of three-tier system design and describes the system’sworkflow and functionality defined; the detailed design stage, first of all the system carry outuse-case analysis to determine the system role and use case model, then, according to thesystem implementation of the logic design of work processes, determine the communicationbetween the systems of each level and intermediate data format, and finally, the design datastructure and interface style.This system is developed. NET-based platform. NET platform is developed by Microsoftand a set of agile software development, rapid application development, platformindependence and network transparency in software development platform for developers toprovide a cross-language unified programming environment, its core components,including the three main components: the common language runtime, theservice framework and the upper layer application template. The development of this system.NET platform greatly improves the security of data processing systems, executionefficiency and scalability.