【作者】 陈维刚；

【导师】 费敏锐；

【作者基本信息】 上海大学 ， 控制理论与控制工程， 2006， 博士

【摘要】 现场总线和工业以太网技术的发展给工业控制网络的发展带来了新的机遇,但是也带来新的问题和挑战。工业通信网络协议的多样性给生成厂商和用户提供了广阔的生存空间和应用空间,但同时也造成了多标准共存的混乱局面。为了解决上述问题,既要顾及多方的商业、技术利益,又要推动这一领域快速、有序的发展。能够实现多个工业通信网络兼容的多协议转换技术是一个有效、实用的解决方案。鉴于现场总线协议的多样性,本文选择已获得广泛应用的MODBUS/TCP工业以太网协议和在设备层具有代表性的DeviceNet现场总线、Profibus DP现场总线作为研究对象。深入剖析了各个协议的报文通信过程,基于多重组合Petri网理论和随机高级Petri网理论,建立了多协议转换系统原理模型和性能模型。并从理论和实验两个方面对多协议转换系统的性能进行了分析。然后以一小型锅炉为对象,以多协议转换器为核心设备,构建了能够兼容多种工业通信网络的小型过程控制系统。主要取得以下研究成果:1.提出了多重组合Petri网的概念,指出了结构相似的多个Petri网模型可以基于具有相同作用的公共库所或公共变迁实现组合,为多协议转换系统原理模型的建立奠定了理论基础。2.给出了多重组合Petri网的两个特有性质-状态不变性和行为不变性的定义。并分析了在不同组合情况下,多重组合Petri网的有界性、活性、状态不变性和行为不变性。提出了在不同组合情况下,多重组合Petri网满足以上性质的充要条件,为多协议转换系统原理模型的验证提供了依据。3.以MODBUS/TCP工业以太网协议、DeviceNet现场总线协议和Profibus现场总线协议的通信过程为切入点,将各个通信状态机统一成通信准备、报文通信和通信断开三个阶段,建立了各个总线的通信模型。基于结构相似的各个总线通信模型,以公共报文缓冲区为公共库所,建立了S-多重组合Petri网模型,从而得到了多协议转换系统原理模型,并验证了原理模型的正确性。4.基于多协议转换系统原理模型和具有标识变量随机高级Petri网理论,将随机时间因素引入原理模型的各个变迁,得到了多协议转换系统性能模型,并基于性能模型,定性的分析了多协议转换器的利用率和吞吐率。基于对实际系统的测试数据,定量的分析了系统在不同情况下的吞吐率、丢包率,并对分别采用这两种方法得到的分析结果进行了比较。结合基于性能模型的分析结果和基于系更多还原

【Abstract】 The development of fieldbus & industrial Ethernet is very advantageous for industrial control networks, nevertheless it results in some new problems and challenges. The diversity of industrial communication networks provides broad living & applied space, but at the same time it leads to a mess of multiple standards. The above problems are waiting to be solved, moreover, the extensive interests of commerce & technology have to be considered and the development of this technology field should be promoted rapidly. According to these factors the technology of multi-protocol conversion is effective & practical.In this paper, the MODBUS/TCP industrial Ethernet, which is applied widely, and DeviceNet & Profibus DP fieldbuses, which are representative device layer fieldbuses among multiple fieldbus standards, were researched objects. The message communication processes of these protocols were analyzed deeply and the principle & performance model of multi-protocol conversion system were made. Further the performance of multi-protocol conversion system was analyzed as to theory & experiment. Finally a small process control system, in which the core device was multi protocol converter and the controlled object was a small boiler, was constructed. The main contributions are as follows:1. The conception of multiple composition Petri net was presented and it was supposed that multiple similar Petri net models could be composed based on public places or public transitions, which behaved similarly. The above conception laid theoretical foundation for principle model of multi-protocol conversion system. 2. Two specialized conceptions, namely, state constancy and behavior constancy were presented. Under different composition situations, the boundness property, liveness property, state constancy and behavior constancy were all analyzed and the necessary and sufficient conditions for above properties were proposed. These conclusions guaranteed the correctness of principle model of multi-protocol conversion system. 3. According to the communication processes of MODBUS/TCP industrial Ethernet, DeviceNet, and Profibus fieldbuses, all communication state machines were uniformed into three stages, namely communication preparation, message communication and communication abort, and communication models of every protocol were made. Based on these communication models, the s-multi conversion Petri net model, in which the更多还原