【作者】 李泳湛；

【导师】 章云；

【作者基本信息】 广东工业大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 把工厂和企业的现场设备接入信息网络统一监控将会成为下一代企业信息化的重要基础之一。目前在工厂和企业应用中,大多数设备利用RS-422、RS-232、RS-485等串行链路以及遵守一定的通信协议将多个设备组成一个控制网络。但这种现场设备控制网络的有效半径比较有限,并且一般是孤立于信息网络以外的,那么将现场设备控制网络连接到企业的信息网络上去具有很大的意义。要实现现场设备控制网络和信息网络的互连,一方面需要解决现场设备控制网络的通信协议与信息网络的通信协议的不同所带来的协议转换的问题,这样就能将传统的串行数据送上信息网络,而无需过早淘汰原有设备,从而提高了现有设备的利用率,节约了投资,还可在既有的网络基础上简化布线复杂度。另一方面,工厂和企业信息网络上普遍应用以太网,为了具备与外界信息网络的互联能力,90%以上的以太网运行TCP/IP协议,为了实现工厂和企业现场设备控制网络到信息网络的统一管理,必须在以太网TCP/IP上遵守通用的而且适合于现场设备管理的应用层协议进行工厂和企业的信息网络的通信,利用基于MODBUS TCP/IP的应用层协议来实现是一个好的解决方案。论文利用Rabbit 3000微处理器以及其功能强大的开发环境,设计了一个可以实现现场设备控制网络和以太网TCP/IP信息网络互连的嵌入式网关,实现了现场设备层和信息管理层的无缝连接。在此基础上,基于工厂和企业中现场设备控制网络与信息网络数据流通的需求和现场设备的统一管理,开发一个基于以太网MODBUS TCP/IP的设备监控系统,实现了对现场设备的集中监控。整个设备监控系统的框架主要由三个客户端/服务器端模式所组成:基于串口通信的MODBUS协议主/从站的客户端/服务器端模式、基于以太网通信的MODBUS TCP/IP协议的客户端/服务器端模式与基于DDE技术的软件客户端/服务器端模式。该设备监控系统经过调试与试用后,能实际应用到潮州市电信大楼的机房专用精密空调联网集中监控系统当中,实现了对潮州市电信大楼的机房专用精密空调的统一联网监控管理和自动地实时地进行空调的有效控制,系统运行稳定。更多还原

【Abstract】 Unified supervisory control of factories and enterprises field equipment by connecting them to the information network will become one of the most important elements that the next generation of enterprise informationization bases on.At present in the factory and enterprise applications,most of the equipment use RS-422、RS-232、RS-485 serial link and communication protocols to connect theirself to a control network.However,the effective radius of the network is relatively limited and generally isolated from the outside of the information network,then connecting the field equipment control network to the information network has great significance.To achieve the interconnection between the scene equipment control network and the information network,on the one hand,the communication protocol of the field equipment control network are different from the one of the Ethernet information network,so it is important to solve the question of protocol conversion,then the traditional serial data can be sent on the Ethernet without the need to prematurely eliminate the original equipment,thereby improving the utilization of existing equipment,saving the investment,and also simplifying the complexity of cabling on the existing network infrastructure.On the other hand,Ethernet has universal application in the information network,and in order to have the information network of Interact capacity,more than 90 percent of Ethernet run TCP/IP protocol,so in order to achieve the unified management of scene equipment control network and information network,we must comply an application layer protocol that the information network can use for communication on Ethemet TCP/IP.MODBUS TCP/IP application layer message transmission protocol is a good solution.This paper based on the Rabbit 3000 microprocessor industrial properties and its powerful development environment,designs a embedded gateway that can realize the communication between the field equipment control network and the Ethernet TCP/IP information network,so the field equipment layer can connect to the information management layer.On this basis,based on the need of data flow between the information network and the control network and the unified management of field equipment in the factories and enterprises,this paper develops the supervisory control and data acquisition system of equipment based on Ethemet MODBUS TCP/IP to realize centralized supervisory control for field equipment.The framework of the whole supervisory control and data acquisition system of equipment is composed with three client/server model:the first client/server model based on MODBUS master/slave station on serial link,the second client/server model based on MODBUS TCP/IP protocol on Ethemet and the third software client/server model based on DDE.After debugging and experimentation,The supervisory control and data acquisition system of equipment can be applied in Chaozhou City CHINA TELECOM Air-conditioning Supervisory Control And Energy-saving System to realize unified Supervisory Control of Air-conditioning and automatic control.The supervisory control and data acquisition system of equipment runs well and stably.更多还原