【正文】 s Day! in shops, hotels and restaurants. But few young women will mark the festival with their boyfriends, or take part in traditional activities to pray for cleverness. 。s Day on February 14, characterized by bouquets of roses, chocolates and romantic candlelight dinners, than they do about their homegrown day for lovers. Even Qixi is nowadays referred to as the Chinese Valentine39。s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a y ear on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughters39。s largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。Strefezza Control of a DC Motor by Using Fuzzy Variable Structure Controller[A].第二十七屆中國(guó)控制會(huì)議論文集 [C].2021 [13]姜建芳 .西門(mén)子 S7300/400PLC 工程應(yīng)用技術(shù) [M].北京 :機(jī)械工業(yè)出版 社 .2021 [14]香曉漢 .西門(mén)子 PLC 高級(jí)應(yīng)用實(shí)例精解 [M].北京 :機(jī)械工業(yè)出版社 .2021 [15]廖常初 .S7300/400PLC 應(yīng)用技術(shù)第二版 [M].北京：機(jī)械工業(yè)出版社 .2021 28 附錄 1： 系統(tǒng)控制原理圖 29 附錄 2： PLC 原理圖 30 請(qǐng)您刪除一下內(nèi)容， O(∩ _∩ )O 謝謝?。?！ Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。北京：機(jī)械工業(yè)出版社 .2021 [9],Peter motion control for process Society Annual Record of the 1989 IEEE,pp:1693～ 1698 [10], Control for Paper Machine TRANSACTIONS ON INDUSTRY APPLICATIONS,JANUARY/FEBRUARY 2021,PP:158163 [11] 趙陽(yáng) .西門(mén)子 S7300 PLC 及工控組態(tài)軟件 WinCC 的應(yīng)用 [J].可編程控制器與工廠自動(dòng)化 .2021 年 ,第 10 期 :2～ 6 [12] P233。 27 [參考文獻(xiàn) ] [1]鄒哲明．化機(jī)漿主體設(shè)備技術(shù)性能的研究 [J]．中國(guó)造紙學(xué)報(bào)， 2021(增下 )： 303～307 [2]李方圓 .西門(mén)子 S7200 的設(shè)計(jì)與應(yīng)用 [J].自動(dòng)化博覽， 2021 年，第 06期 :2～ 5 [3]楊旭 .中國(guó)造紙機(jī) 械制造業(yè)現(xiàn)狀及發(fā)展趨勢(shì) [J].中華紙業(yè)， 2021，（ 12）： 6～ 10 [4]劉桂雄 ,馮云慶 ,申柏華 .現(xiàn)場(chǎng)總線與虛擬儀表技術(shù)相融合的發(fā)展新趨勢(shì) [J].傳感器技 ,。同時(shí)我還要感謝我的父母，是他們的支持讓我完成了四年的大學(xué)學(xué)習(xí)生涯，讓我擁有足夠的知識(shí) 完成這次畢業(yè)設(shè)計(jì)，另外我還要感謝我的同學(xué)，是他們?cè)谖耶厴I(yè)設(shè)計(jì)遇到困難時(shí)給予我及時(shí)的幫助，對(duì)我畢業(yè)設(shè)計(jì)的完成功不可沒(méi)。感謝他在繁忙的工作之余，擠出時(shí)間對(duì) 我的畢業(yè)設(shè)計(jì)提出寶貴的意見(jiàn) 。在這里需要感謝的人很多，是他們讓我 在學(xué)習(xí)與做人方面有了很大的成長(zhǎng)。 26 謝 辭 光陰似箭，四年的大學(xué)生活轉(zhuǎn)眼即逝，經(jīng)過(guò)大四下學(xué)期精心準(zhǔn)備，我終于完成了屬于自己的畢業(yè)設(shè)計(jì)。我也將會(huì)在今后的工作學(xué)習(xí)中不斷充實(shí)自己，不斷完善自己的專(zhuān)業(yè)知識(shí)，為自身的發(fā)展打下堅(jiān)實(shí)的基礎(chǔ)。 相對(duì)于傳統(tǒng)造紙機(jī)械，本系統(tǒng)具有操作簡(jiǎn)便，成本低廉，自動(dòng)化程度高等優(yōu)點(diǎn)。該系統(tǒng)利用 PLC 與變頻器之間的通訊控制，實(shí)現(xiàn)對(duì)三相交流電機(jī)的起動(dòng)、加速、減速與爬行控制。 數(shù) 據(jù) 塊 如 圖 所 示 。 圖 電機(jī)的啟動(dòng)程序 與電機(jī)的啟動(dòng)類(lèi)似，使用專(zhuān)用指令代碼十六進(jìn)制數(shù) 447，有數(shù)據(jù)模塊將其發(fā)送到ABB 變頻 器的專(zhuān)用通訊適配器中，控制變頻器的停止操作。同時(shí)通訊模塊還負(fù)責(zé)將變頻器中的指令數(shù)據(jù)反饋給 PLC，實(shí)現(xiàn) PLC與變頻器之間數(shù)據(jù)的實(shí)時(shí)交換。對(duì)于各個(gè)電機(jī)的控制點(diǎn)如圖 所示。通訊程序主要是用來(lái)交換 PLC與通訊適配器之間的指令數(shù)據(jù)，使 PLC 很好的控制變頻器，使得電動(dòng)機(jī)能很好工作。 22 本設(shè)計(jì)的程序包括主程序塊 OB，數(shù)據(jù)塊 DB，功能塊 FC。如圖 42 所示，造紙機(jī) 的控制程序編寫(xiě)主要包括初始化，加速、減速、啟動(dòng)、停止、爬行。用NPBA12通訊適配器與 ProfibusDP網(wǎng)連接在一起，適配器相當(dāng)于變頻器。 圖 PLC的硬件組態(tài) 圖中選用 CPU 3152DP，其自帶 ProfibusDP 接口，同時(shí)滿足所需的控制要求。選定 315DDP 為主站系統(tǒng)，添加到系統(tǒng)文件中的 NPBA12 通訊適配器的 GSD文件作為從站，連接到 ProfibusDP網(wǎng)上，并選定使用的 PPO 類(lèi) 型，設(shè)定站點(diǎn)網(wǎng)絡(luò)地址 ,保存編譯并退出 Hardwre Configure 環(huán)境。即將 NPBA12 的 GSD(設(shè)備數(shù)據(jù)庫(kù) )文件 ，文件名為 )導(dǎo)人 STEP7的編程環(huán)境中，為后面的相關(guān)工作做好準(zhǔn)備。 添加通訊適配器 STEP7 編程軟件環(huán)境下的硬件組態(tài)與編程準(zhǔn)備工作：確定系統(tǒng)所需的 SIMATIC S7300 PLC 所使用模塊的具體型號(hào)，包括數(shù)字輸入模塊，數(shù)字輸出模塊，電源模塊，CPU 模塊，模擬量輸出模塊。本次設(shè)計(jì)使用到的是 Step7 版本 ，使用其強(qiáng)大功完成對(duì)本系統(tǒng)的軟件設(shè)計(jì) PLC 和變頻器控制系統(tǒng)采用了 Profibus— DP 現(xiàn)場(chǎng)總線控制模式后，不但整個(gè)系統(tǒng)接線簡(jiǎn)單，而且運(yùn)行穩(wěn)定，操作簡(jiǎn)便，反饋的信息全面，可實(shí)時(shí)掌握電機(jī)的各種狀態(tài)信息，可根據(jù)現(xiàn)場(chǎng)的工藝要求在后臺(tái)隨時(shí)修改參數(shù)，大大減 少了人力和物力資源，真正實(shí)現(xiàn)了“分散控制，集中管理”。 STEP 7 編程 軟件用于 西門(mén)子 系列工控產(chǎn)品包括 SIMATIC S M C7 和基于 PC的 Win AC 的編程、監(jiān)控和參數(shù)設(shè)置，是 SIMATIC 工業(yè)軟件的重要組成部 分 。依據(jù)造紙機(jī)系統(tǒng)的要求此處選用型號(hào)為 HLP2B80 的數(shù)顯表，經(jīng)濟(jì)實(shí)用，能很好滿足要求。應(yīng)用范圍：配電箱，工業(yè)自動(dòng)化，自動(dòng)化變電站，樓宇自動(dòng)化。 本次設(shè)計(jì)的系統(tǒng)中模擬量輸出模塊選用型號(hào)為 6ES7 3325HF000AB0。這里參考系統(tǒng)要求選用型號(hào)為 6ES7