【正文】 ton(1)=1）。首先一外層有人提出上升（ Button(0)=1）請(qǐng)求并按下上升到三層（ floor(2)=1）按鍵，電梯上升過(guò)程中二層外分別有人按下上升（ Button(1)=1）和下降（ Button(2)=1）的按鈕，同時(shí)三層外有人按下下降（ Button(3)=1）按鈕。當(dāng)電梯回到一層的瞬間三層外又有人按下下降按鈕（ Button(3)=1），此時(shí)電梯在一層做短暫停留后再次回到三層，三層使用者進(jìn)入后按下到達(dá)一層按鈕（ floor(0)=1），電梯再次回到一層。 外部請(qǐng)求按鍵較多，電梯在上升過(guò)程中只能響應(yīng)高于其當(dāng)前所在樓層的請(qǐng)求，反之在下降過(guò)程中只能響應(yīng)低于其當(dāng) 前所在樓層的請(qǐng)求。 使用者在電梯內(nèi)外提出的請(qǐng)求不一致，例如圖 45中進(jìn)行仿真的情況。可以根據(jù)要求打印出各項(xiàng)指標(biāo)參數(shù)和曲線圖及仿真圖，且重復(fù)一次性好。在設(shè)計(jì)過(guò)程中我們首先把整個(gè)電梯設(shè)計(jì)根據(jù)功能分成若干個(gè)功能模塊，然后理清個(gè)模塊的時(shí)序，一以便將各個(gè)功能模塊綜合在一起 ,能夠公用書籍總線，使其能正常工作不受干擾，有些程序在仿真的時(shí)候 其時(shí)序是完全正確的，但是當(dāng)程序下載到芯片上之后就會(huì)發(fā)現(xiàn)錯(cuò)誤了。 展望 三層電梯廣泛應(yīng)用在大型的貨運(yùn)之中。 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)設(shè)計(jì) 21 致 謝 本次畢業(yè)設(shè)計(jì)能夠順利完成，是指導(dǎo)老師、在設(shè)計(jì)過(guò)程中幫助我們的同學(xué)、我的搭檔和我共同努力的結(jié)果，在這里我對(duì)老師、一起努力的同學(xué)和我的搭檔表示真誠(chéng)的感謝！ 隨著畢業(yè)設(shè)計(jì)的完成，自己四年的大學(xué)生活也接近了尾聲，在這四年難忘的歲月中，留下許多美好的回憶，尤其是最后的畢業(yè)設(shè)計(jì)，更是令我記憶深刻。 現(xiàn)在我即將揮別自己的大學(xué)生活，萬(wàn)千感慨上心頭，有對(duì)校園和同學(xué)戀戀不舍，更有對(duì)美好未來(lái)的憧憬。中國(guó)建筑工業(yè)出版社， 1997 [4]張漢杰，王錫鐘編著。 2021年 5月 [7]SIEMENS公司編著，西門子 (中國(guó) )有限公司譯 [Z]。西安交通大學(xué)出版社， 1998 [9]汪曉光，孫曉瑛等編著。北京理工大學(xué)出版社， 2021 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)設(shè)計(jì) I 附 錄 附錄 A 外文資料 Building Programmable Automation Controllers with LabVIEW FPGA Overview Programmable Automation Controllers (PACs) are gaining acceptance within the industrial control market as the ideal solution for applications that require highly integrated analog and digital I/O, floatingpoint processing, and seamless connectivity to multiple processing nodes. National Instruments offers a variety of PAC solutions powered by one mon software development environment, NI LabVIEW. With LabVIEW, you can build custom I/O interfaces for industrial applications using addon software, such as the NI LabVIEW FPGA Module. With the LabVIEW FPGA Module and reconfigurable I/O (RIO) hardware, National Instruments delivers an intuitive, accessible solution for incorporating the flexibility and customizability of FPGA technology into industrial PAC systems. You can define the logic embedded in FPGA chips across the family of RIO hardware targets without knowing lowlevel hardware description languages (HDLs) or boardlevel hardware design details, as well as quickly define hardware for ultrahighspeed control, customized timing and synchronization, lowlevel signal processing, and custom I/O with analog, digital, and counters within a single device. You also can integrate your custom NI RIO hardware with image acquisition and analysis, motion control, and industrial protocols, such as CAN and RS232, to rapidly prototype and implement a plete PAC system. Table of Contents Introduction NI RIO Hardware for PACs Building PACs with LabVIEW and the LabVIEW FPGA Module FPGA Development Flow 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)設(shè)計(jì) II Using NI SoftMotion to Create Custom Motion Controllers Applications Conclusion Introduction You can use graphical programming in LabVIEW and the LabVIEW FPGA Module to configure the FPGA (fieldprogrammable gate array) on NI RIO devices. RIO technology, the merging of LabVIEW graphical programming with FPGAs on NI RIO hardware, provides a flexible platform for creating sophisticated measurement and control systems that you could previously create only with customdesigned hardware. An FPGA is a chip that consists of many unconfigured logic gates. Unlike the fixed, vendordefined functionality of an ASIC (applicationspecific integrated circuit) chip, you can configure and reconfigure the logic on FPGAs for your specific application. FPGAs are used in applications where either the cost of developing and fabricating an ASIC is prohibitive, or the hardware must be reconfigured after being placed into service. The flexible, softwareprogrammable architecture of FPGAs offer benefits such as highperformance execution of custom algorithms, precise timing and synchronization, rapid decision making, and simultaneous execution of parallel tasks. Today, FPGAs appear in such devices as instruments, consumer electronics, automobiles, aircraft, copy machines, and applicationspecific puter hardware. While FPGAs are often used in industrial control products, FPGA functionality has not previously been made accessible to industrial control engineers. Defining FPGAs has historically required expertise using HDL programming or plex design tools used more by hardware design engineers than by control engineers. With the LabVIEW FPGA Module and NI RIO hardware, you now can use LabVIEW, a highlevel graphical development environment designed specifically for measurement and control applications, to create PACs that have the customization, flexibility, and highperformance of FPGAs. Because the LabVIEW FPGA Module configures custom circuitry in hardware, your system can process and generate synchronized analog and digital signals rapidly and deterministically. Figure 1 illustrates many of the NI RIO devices that you can configure using the LabVIEW FPGA Module. NI RIO Hardware for PACs Historically, programming FPGAs has been limited to engineers who have indepth 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)設(shè)計(jì) III knowledge of VHDL or other lowlevel design tools, which require overing a very steep learning curve. With the LabVIEW FPGA Module, NI has opened FPGA technology to a broader set of engineers who can now define FPGA logic using LabVIEW graphical development. Measurement and control engineers can focus primarily on their test and control application, where their expertise lies, rather than the lowlevel semantics of transferring logic into the cells of the chip. The LabVIEW FPGA Module model works because of the tight integration between the LabVIEW FPGA Module and the mercial offtheshelf (COTS) hardware architecture of the FPGA and surrounding I/O ponents. National Instruments PACs provide modular, offtheshelf platforms for your industrial control applications. With the implementation of RIO technology on PCI, PXI, and Compact Vision System platforms and the introduction of RIObased CompactRIO, engineers now have the benefi