PROFIBUS智能通信接口設(shè)計

本文共45頁 14018字

摘 要
針對現(xiàn)場總線在我國的應(yīng)用和發(fā)展現(xiàn)狀，在研究PROFIBUS-DP現(xiàn)場總線基本理論(主要包括系統(tǒng)組成、協(xié)議結(jié)構(gòu)、數(shù)據(jù)存取機(jī)制、從站通信原理)，并在此基礎(chǔ)上，提出了通過用軟件實(shí)現(xiàn)數(shù)據(jù)鏈路層協(xié)議開發(fā)智能化從站接口的方案。研究過程中利用先進(jìn)的編程工具和編程語言完成系統(tǒng)軟件開發(fā)。整個設(shè)計過程經(jīng)歷了系統(tǒng)方案的設(shè)計，系統(tǒng)軟硬件的設(shè)計，以及系統(tǒng)測試幾個階段。
本文采用單片機(jī)的串行口(UART)與主站進(jìn)行通信，由軟件實(shí)現(xiàn)數(shù)據(jù)鏈路層協(xié)議，即在51系列單片機(jī)中集成PROFIBUS-DP從站的部分協(xié)議，通過運(yùn)行單片機(jī)中的程序，實(shí)現(xiàn)DP從站協(xié)議，從而代替專用協(xié)議芯片。
最后本文對課題的設(shè)計工作進(jìn)行了總結(jié)，并對 PROFIBUS-DP智能通信接口的設(shè)計進(jìn)行實(shí)驗與實(shí)現(xiàn)。

關(guān)鍵字： 現(xiàn)場總線；PROFIBUS；通信接口；通信協(xié)議；OEM2；

ABSTRACT
Exactly according to the current status of Fieldbus development and application in our country, studying the basic theory of PROFIBUS-DP (including system composing, protocol structure, data access mechanism and slave station communication principle), based on which this paper puts forward development proposal for the PROFIBUS-DP intelligent slave station’s communication interface. During the research of the thesis, use advanced programming tool and program language to develop software of the system. The whole research and design has come through the following stages: design of system scheme, design of hardware and software, and system test.
This paper is use the MCU serial port (UART) and the main station for communications, actualize the protocol of data link layer by the software.That is integrating parts of PROFIBUS Slave Station protocol in the 51 series CMOS. So it can replace the special protocol chip and realizes the function of intelligent slave station.
Finally, this paper summarizes the whole work of the design, and brings forward the experimentation and actualization for the design of PROFIBUS-DP intelligent slave station interface.

Keywords：Fieldbus；PROFIBUS；Communication Interface；Communication Protocol；OEM2；

目 錄
摘 要 I
ABSTRACT II
第1章 緒論 1
1.1 引言 1
1.2現(xiàn)場總線的概念 2
1.3現(xiàn)場總線的特點(diǎn) 2
第2章 PROFIBUS原理 4
2.1 PROFIBUS類型 4
2.2 PROFIBUS-DP協(xié)議 5
2.2.1 PROFIBUS-DP協(xié)議結(jié)構(gòu) 5
2.2.2 PROFIBUS-DP報文格式 6
2.2.3 PROFIBUS-DP通信方式 8
2.2.4 PROFIBUS-DP波特率自適應(yīng) 9
2.3 PROFIBUS－DP物理層 9
2.3.1 RS-485傳輸技術(shù) 9
2.3.2總線連接器 10
2.3 PROFIBUS－DP數(shù)據(jù)鏈路層 11
2.3.1 PROFIBUS－DP幀格式 11
第3章 PROFIBUS的通信系統(tǒng)設(shè)計 13
3.1 系統(tǒng)概述 13
3. 2系統(tǒng)總體設(shè)計 13
3.2.1 單片機(jī)的選擇 14
3.2.2 接口的設(shè)計 15
3.3通信接口的通信過程 17
3.4 OEM2介紹 17
第4章 接口板的軟件設(shè)計 19
4.1程序流程圖 19
4.2模擬串口的實(shí)現(xiàn) 22
4.2.1 串行通信的基本原理 22
4.2.2 模擬串口程序設(shè)計 23
4.3設(shè)備數(shù)據(jù)庫文件(GSD) 25
第5章 系統(tǒng)仿真與實(shí)驗 26
5.1 KEIL C51開發(fā)系統(tǒng) 26
5.2實(shí)驗結(jié)果 26
第6章 結(jié)論 28
參考文獻(xiàn) 29
致 謝 30
附錄 31

參考文獻(xiàn)
[1] Profibus Specification［S］．Edition 1．0，March 1998．
[2] SIEMENS，SPC3 and DPS2 User Description［M］．Version：1．8，F(xiàn)ed 2000．
[3] EduardoTovar.Real Time Fieldbus Communications Using Profibus.IEEE Industrial Electronics,Vo146 ,Dec1999
[4] SIEMENS. IEC 61158 Working with PROFIBUS-DP Device Description Data Files GSD .Version: 2.2 ,April 2003