动态可重构工业以太网网络节点设计与研究

发布时间：2018-04-06 21:11

本文选题：工业以太网　切入点：基础资源库　出处：《西南大学》2017年硕士论文

【摘要】：由于工业以太网技术显著的优势,其应用范围越来越广泛。但是众多的工业以太网解决方案,致使同一工业现场时常出现多种协议共存,而单一设备仅能适应一种网络。实际现场中,同一工厂不同应用的工程实施时间不同,所采用的网络会有所差异;同一系统各子系统之间所用网络也不尽相同。设计者和使用者时常会受到不同协议之间转换的问题困扰,不得不购置大量适用于不同控制网络的设备,作为不同网络的备件,来维持整个系统的稳定性与完整性。多种网络的并存使得工业设备的开发者和使用者都面临着巨大的考验,亟需一种具有动态适应网络通信变化能力的节点设备。为了使得网络节点设备可以满足多种不同工业以太网的通信需求,节点设备需要具有在线辨识的能力,动态辨识所在网络的协议类型,同时节点设备还需要具有在线重构的功能,在不断开系统的情况下自动重配置节点设备内部的协议类型。节点设备还需要能尽可能多的支持多种工业以太网,对应的基础资源库构建也非常重要。本文将局部动态可重构技术的思想和方法应用到工业以太网中,设计研究局部动态可重构网络节点,使得底层网络节点设备可以兼容多种工业以太网,增强了网络节点设备的复用性和互换性。研究中,构建了针对三种工业以太网的基础资源库;建立了协议辨识算法;对局部动态重构的方法进行研究设计。本文的主要研究工作如下:(1)构建工业以太网的基础资源库。以FPGA技术为基础,对三种工业以太网EtherCAT、Powerlink和Modbus TCP/IP的通信模型及节点结构进行分析,以硬件电路,FPGA的硬件逻辑,片上可编程系统,以及在Nios II软核中的软件设计相结合的方式,研发可独立实现各以太网通信功能的基础资源库。(2)动态重构网络节点的通信协议在线辨识。在接入相应的工业以太网网络后,对网络中的通信帧进行解析,自动识别当前网络的协议类型。根据以太网通信帧的结构,分析辨识原理,设计辨识电路,约定辨识节点,研究辨识节点值获取算法,然后采用C4.5决策树算法自动完成协议类型的识别。(3)动态重构网络节点得工业以太网局部动态硬件可重构。将局部动态硬件可重构技术应用到工业以太网中,按照可重构方法六步骤,重构配置,重构划分,重构辨识,重构规划,重构切换,重构评估,设计研发局部动态可重构网络节点。并分别对这六个步骤进行了详细的研究和开发。最后搭建实物平台,分别建立三种工业以太网的通信网络,将动态重构网络节点依次接入三种网络,通过信号抓取,实物观测,通信仿真来判断动态重构网络节点是否能够在线辨识协议当前网络的类型,自动重构节点内部的协议类型,完成通信。从而验证动态重构网络节点辨识功能、重构功能与通信功能的正确性。
[Abstract]:Because of the obvious advantage of industrial Ethernet technology, its application scope is more and more extensive.However, many industrial Ethernet solutions lead to the coexistence of multiple protocols in the same industrial site, while a single device can only adapt to one network.In practice, different application time of project in the same plant will lead to different network, and the network used among subsystems of the same system will be different.Designers and users often suffer from the problem of conversion between different protocols and have to purchase a large number of equipment suitable for different control networks as spare parts for different networks to maintain the stability and integrity of the whole system.With the coexistence of many kinds of networks, the developers and users of industrial equipments are facing a great challenge. It is urgent to have a kind of node equipment which can adapt to the change of network communication dynamically.In order to make the network node equipment meet the communication requirements of different industrial Ethernet, the node equipment needs to have the ability of on-line identification and dynamically identify the protocol type of the network in which it is located.At the same time, the node equipment also needs to have the function of online reconfiguration, and automatically reconfigure the protocol type of the node device under the condition of continuously opening the system.Node devices also need to be able to support as many industrial Ethernet as possible.This paper applies the idea and method of local dynamic reconfigurable technology to industrial Ethernet, designs and studies local dynamic reconfigurable network nodes, so that the underlying network node devices can be compatible with various industrial Ethernet.The reusability and interchangeability of network node devices are enhanced.In the research, the basic resource base of three kinds of industrial Ethernet is constructed; the protocol identification algorithm is established; and the method of local dynamic reconstruction is studied and designed.The main research work of this paper is as follows: 1) constructing the basic resource base of industrial Ethernet.Based on FPGA technology, the communication model and node structure of three kinds of industrial Ethernet Ethernet Ethernet Powerlink and Modbus TCP/IP are analyzed. The hardware logic of hardware circuit, the on-chip programmable system and the software design in Nios II soft core are combined.Research and development of the basic resource base. 2) dynamically reconstructing the communication protocol online identification of the network nodes which can independently realize the communication function of each Ethernet.After accessing the corresponding industrial Ethernet network, the communication frames in the network are analyzed, and the protocol types of the current network are automatically identified.According to the structure of Ethernet communication frame, the identification principle is analyzed, the identification circuit is designed, the node is agreed to be identified, and the algorithm of obtaining the value of the identification node is studied.Then the C4.5 decision tree algorithm is used to automatically complete the recognition of protocol types. The network nodes are dynamically reconstructed to obtain the local dynamic hardware reconfiguration of industrial Ethernet.The local dynamic hardware reconfigurable technology is applied to industrial Ethernet. According to the six steps of reconfigurable method, reconfiguration configuration, reconfiguration partition, reconfiguration identification, reconfiguration planning, reconfiguration switching, reconfiguration evaluation, etc.Design and development of local dynamic reconfigurable network nodes.The six steps are studied and developed in detail.Finally, the physical platform is built, and the communication networks of three kinds of industrial Ethernet are established respectively. The dynamically reconstructed network nodes are connected to the three kinds of networks in turn, and through the signal grabbing, the physical observation is carried out.Communication simulation is used to determine whether the dynamically reconfigurable network node can identify the current network type on line, automatically reconfigure the protocol type within the node, and complete the communication.In order to verify the dynamic reconfiguration network node identification function, the reconstruction function and the communication function correctness.
【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

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