基于CAN现场总线的分布式控制系统设计 毕业论文 优秀毕业设计及文献综述.doc

摘 要 现场总线是安装在制造或过程区域的现场装置与控制室内自动控制装置之间的数字式、串行、多点通信的数据总线。它在计算机和现场设备之间架起一座通信桥梁,它是全球数字化、双向、多点的通信总线,具有开放式、全分布、互操作性的特点,是当今自动化领域技术发展的热点之一。 CAN(控制器局域网)属于现场总线的范畴，主要用于与其他外围设备或单片机进行通讯的模块，这种接口协议能在较大的燥声环境中进行通信，具有良好的抗干扰性能。 本文采用 CAN 现场总线技术，设计开发了一种分布式测量控制系统。系统中采用了计算机、控制、通信、网络和电路设计等多领域的技术，使系统具有较完备的监测功能和控制功能，稳定的性能、友好的界面。研究内容包括节点硬件、接口卡硬件研制；节点软件、接口卡软件研制；上位机监测和控制软件的研制。研究的具体任务是电源电路、复位电路、晶振电路、串口通信接口电路、CAN总线通讯电路节点、硬件设计图和总体系统图。 本文主要从以下几个方面阐述： 第一章介绍分布式系统、现场总线的概念和特点，并介绍了传统的 RS232 和RS485 串行通信标准。 第二章介绍 CAN 技术的分层结构、帧结构及通信原理。根据其特点提出分布式测量系统的结构。 第三章介绍基于CAN现场总线的分布式控制系统接口卡和节点的电路设计和芯片选用。 最后是全文的工作总结，对系统的完善与相关理论和技术的发展进行了展望。 关健词：现场总线; CAN; 分布式测量系统; PIC单片机; MCP2510CAN控制器 ABSTRACT The field bus is installs in the manufacture or in the process region scene installment and the control room between the automatic control device digital, serial, the multi-spot correspondence data bus.It puts up a correspondence bridge between the computer and the scene equipment, it is the global digitization, bidirectional, the multi-spot correspondence main line, has, the entire distribution, the Interoperability characteristic open style, is now one of automated domain technological development hot spots. CAN (controller area network) belongs to the field bus category, mainly uses in with other auxiliary equipment or the monolithic integrated circuit carries on the communication the module, this kind of connection agreement can carry on the correspondence in the big dry sound environment, has the good resistance to interference. A distributed measurement and control system was developed based on CAN field bus. The technologies in some fields including computer, control, communication, network and circuit design were used which enable a comparatively rich functions in monitor and control, in addition to stable performance and friendly interface. Research content includes the research on hardware of node and CAN-PC interface card, software both running on node and interface card, and software running on PC for monitor and co