【摘要】：在工業(yè)控制系統(tǒng)中,串行通信簡(jiǎn)單、可靠、易于實(shí)現(xiàn),而且具有很好的數(shù)據(jù)傳輸能力,因而廣泛用于工業(yè)控制系統(tǒng)設(shè)備中。但是,這類設(shè)備常常采用集中的管理方式,并不易擴(kuò)展。隨著互聯(lián)網(wǎng)的發(fā)展和廣泛普及,工業(yè)領(lǐng)域的控制模式也發(fā)生了巨大的變化,工業(yè)控制系統(tǒng)正在日趨網(wǎng)絡(luò)化和分散化。于是將工業(yè)控制中的設(shè)備通過以太網(wǎng)組成分布式的工業(yè)控制網(wǎng)絡(luò)系統(tǒng)成為了必然趨勢(shì)。 要將現(xiàn)場(chǎng)控制網(wǎng)絡(luò)和信息網(wǎng)絡(luò)相連,只需要解決由于現(xiàn)場(chǎng)控制網(wǎng)絡(luò)上的通信協(xié)議和信息網(wǎng)絡(luò)上的通信協(xié)議的不同而引起的協(xié)議轉(zhuǎn)換問題,就可以將傳統(tǒng)串行鏈路上的數(shù)據(jù)傳輸?shù)叫畔⒕W(wǎng)絡(luò)上,而不需要淘汰原有的設(shè)備,如此可以提高原有設(shè)備利用率,節(jié)約成本,還可以在已有網(wǎng)絡(luò)的基礎(chǔ)上最大化的簡(jiǎn)化布線的復(fù)雜度。 本文根據(jù)工控環(huán)境的需要,設(shè)計(jì)了低成本的嵌入式串口聯(lián)網(wǎng)服務(wù)器,實(shí)現(xiàn)串口數(shù)據(jù)流與以太網(wǎng)數(shù)據(jù)幀之間的轉(zhuǎn)換,使分散于工控現(xiàn)場(chǎng)的串口設(shè)備接入以太網(wǎng),以實(shí)現(xiàn)工業(yè)監(jiān)控中對(duì)數(shù)據(jù)采集、傳輸及設(shè)備控制的分布式智能管理。 本文介紹了串口聯(lián)網(wǎng)服務(wù)器的意義和作用,實(shí)現(xiàn)了基于ARM Cortex-M3構(gòu)架的32位高性能、低成本微處理器LM3S6911、開源的嵌入式實(shí)時(shí)操作系統(tǒng)Rt-Thread及開源的Lwip協(xié)議的串口聯(lián)網(wǎng)服務(wù)器的完整設(shè)計(jì),并且開發(fā)了上位機(jī)配置軟件。 本設(shè)計(jì)主要包括三個(gè)部分： 1)根據(jù)工控環(huán)境特點(diǎn),選用低功耗、高性能的嵌入式處理器LM3S6911,該處理器結(jié)合了10/100Mbps以太網(wǎng)媒體訪問控制(MAC)以及物理層(PHY),使得本設(shè)計(jì)可以實(shí)現(xiàn)單芯片的解決方案。 2)在移植嵌入式實(shí)時(shí)操作系統(tǒng)Rt-Thread和嵌入式TCP/IP協(xié)議棧Lwip的基礎(chǔ)上,開發(fā)了數(shù)據(jù)交換程序和各接口之間的通信程序。 3)在windows平臺(tái)上,開發(fā)實(shí)現(xiàn)了可供用戶對(duì)串口聯(lián)網(wǎng)服務(wù)器進(jìn)行配置的上位機(jī)軟件。 最后給出了功能及性能測(cè)試結(jié)果。 本文設(shè)計(jì)的工業(yè)串口聯(lián)網(wǎng)服務(wù)器具有體積小、性能高、操作簡(jiǎn)單、成本低等優(yōu)點(diǎn),適用于工控環(huán)境,滿足實(shí)際需求。
[Abstract]:In the industrial control system, the serial communication is simple, reliable, easy to realize, and has good data transmission ability, so it is widely used in industrial control system equipment. However, such devices are often managed centrally and are not easily scalable. With the development and popularization of the Internet, the control mode in the industrial field has changed greatly, and the industrial control system is becoming more and more networked and decentralized. Therefore, it is an inevitable trend to form a distributed industrial control network system by Ethernet. To connect the field control network with the information network, we only need to solve the problem of protocol conversion caused by the difference between the communication protocol on the field control network and the communication protocol on the information network. The data on the traditional serial link can be transmitted to the information network without the need to eliminate the original equipment, which can improve the utilization rate of the original equipment and save the cost. It can also maximize the complexity of simplified routing on the basis of existing networks. According to the need of industrial control environment, a low-cost embedded serial port network server is designed in this paper to realize the conversion between serial data stream and Ethernet data frame, so that the serial port devices scattered in industrial control field can connect to Ethernet. In order to realize the distributed intelligent management of data acquisition, transmission and equipment control in industrial monitoring. This paper introduces the significance and function of serial port network server, and realizes the complete design of 32 bits high performance, low cost microprocessor LM3S6911, open source embedded real time operating system Rt-Thread and open source Lwip protocol serial port network server based on ARM Cortex-M3 architecture. And developed the upper computer configuration software. This design mainly includes three parts: 1) according to the characteristics of industrial control environment, select low power consumption, The high performance embedded processor LM3S6911, which combines 10/100Mbps Ethernet media access control (MAC) and physical layer (PHY), enables this design to implement a single-chip solution. 2) porting embedded real-time operating system Based on Rt-Thread and embedded TCP/IP protocol stack Lwip, The data exchange program and the communication program between the interfaces are developed. 3) on the windows platform, the upper computer software which can be configured for the serial port network server is developed. Finally, the test results of function and performance are given. The industrial serial port network server designed in this paper has the advantages of small volume, high performance, simple operation and low cost. It is suitable for industrial control environment and meets the actual demand.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TP368.1;TP273

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