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HMI configuration software clusters and distributed file locking Research and Implementation

Author: FengHao
Tutor: LiYi
School: University of Electronic Science and Technology
Course: Computer System Architecture
Keywords: Configuration software Cluster Distributed Lock
CLC: TP273.5
Type: Master's thesis
Year: 2008
Downloads: 130
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Abstract


With the network technology and the rapid development of digital communications technology, industrial automation field has undergone tremendous changes in the field of automation and gradually formed the open systems and Internet communications network. In a distributed control system, the software technology is an important part. In recent years, the field of industrial configuration software is very active part, it appears and the rise of industrial software design has injected new vitality. Configuration software to solve the traditional closed model control system software to enhance the versatility of the software, in the practical application of the project do not have a lot of repetitive programming work to improve the rate of software reuse. In this paper, the background configuration software, configuration software analysis of the current deficiencies in the application. Configuration software for the specific application configuration file consistency needs, drawing on the flexibility and structure of the cluster system can be extended release, as well as distributed transaction processing two-phase commit protocol, proposed a cluster-based system configuration files Distributed Lock. This paper mainly solves two problems: 1: HMI (Human Machine Interface, abbreviated HMI) cluster structure of the dynamic management and maintenance. 2: Configuration file format and the implementation of a distributed lock interaction protocols, ie distributed locking protocol. The distributed locking protocol with real-time, non-blocking and durable characteristics. At present, this system has been applied to a configuration software. For the first question, the paper first describes the concept and development of configuration software, configuration software discussed common software architecture, features and design ideas, and on this basis to obtain the specific needs of the HMI cluster. Then combined cluster and heartbeat basic principle of the dynamic design of the cluster system management and maintenance protocols, including cluster node startup and on-line protocol, nodes offline and withdraw from the agreement and other cluster nodes normal dynamic management protocol. And taking into account the unusual circumstances nodes in the cluster, node status query protocol design and bootstrap protocol to achieve a master node heartbeat mechanism and method of election. Another important issue for this paper, namely distributed lock Research and Implementation. The system first analyzes distributed lock specific needs and based on the design of this distributed locking semantics and specific forms of implementation, and finally two-phase commit protocol according to the algorithm given in the form of interactive distributed lock procedures. And solve network congestion problems that may arise. In the end, the performance of the system are briefly analyzed, and the actual test results illustrate the practical application of solutions to achieve objectives.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system > Computer control, computer control system
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