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基于plc的液位控制畢業(yè)設(shè)計(jì)開題報(bào)告-展示頁

2025-04-03 12:43本頁面
  

【正文】 em behavior and functionality is tested through simulation. In general, a plete verification is impossible. Hence, a systematic approach as exemplified for the PLC program design may impact the logical hardware design. SIEMENS PLC SIMATIC S7300 series PLC applied to all walks of life and various occasions in the detection, monitoring and control of automation, its power to both the independent operation of, or connected to a network able to achieve plex control. The photoelectric products with isolation, high electromagnetic patibility。 IEC 61499, 1998。五、主要參考文獻(xiàn)(按作者、文章名、刊物名、刊期及頁碼列出)四、主要參考資料:[1] 于海生. 微型計(jì)算機(jī)控制技術(shù)[M].北京:清華大學(xué)出版社,2005[2] 王再英. 過程控制系統(tǒng)與儀表[M].北京:機(jī)械工業(yè)出版社,2005[3] [M].北京:清華大學(xué)出版社,2005[4] 過程控制實(shí)驗(yàn)室指導(dǎo)手冊(cè)[5]:重慶大學(xué)出版社,2002. [6](PC)編程、應(yīng)用和維修[M].北京:清華大學(xué)出版社,1995.指導(dǎo)教師 年 月 日系意見:AbstractA systematic approach to designing PLC software can overe deficiencies in the traditional way of programming manufacturing control systems, and can have wide ramifications in several industrial applications. Automation control systems are modeled by formal languages or, equivalently, by state machines. Formal representations provide a highlevel description of the behavior of the system to be controlled. State machines can be analytically evaluated as to whether or not they meet the desired goals. Secondly, a state machine description provides a structured representation to convey the logical requirements and constraints such as detailed safety rules. Thirdly, welldefined control systems design outes are conducive to automatic code generation An ability to produce control software executable on mercial distinct logic controllers can reduce programming leadtime and labor cost. In particular, the thesis is relevant with respect to the following aspects. In modern manufacturing, systems are characterized by product and process innovation, bee customerdriven and thus have to respond quickly to changing system requirements. A major challenge is therefore to provide enabling technologies that can economically reconfigure automation control systems in response to changing needs and new opportunities. Design and operational knowledge can be reused in realtime, therefore, giving a significant petitive edge in industrial practice. Studies have shown that programming methodologies in automation systems have not been able to match rapid increase in use of puting resources. For instance, the programming of PLCs still relies on a conventional programming style with ladder logic diagrams. As a result, the delays and resources in programming are a major stumbling stone for the progress of manufacturing industry. Testing and debugging may consume over 50% of the manpower allocated for the PLC program design. Standards [IEC 60848, 1999。5月6日至5月12日:在導(dǎo)師的指導(dǎo)和幫助下進(jìn)一步對(duì)論文進(jìn)行修改、定稿。4月22日至4月28日: 確定論文的基本框架,準(zhǔn)備撰寫論文。4月8日至4月14日:利用s7300組態(tài)軟件繪制液位控制控制邏輯圖。3月25日至3月31日:利用MATLAB仿真軟件調(diào)試合適的控制參數(shù)。1月7日至1月13日:利用s7300監(jiān)控軟件繪制液位控制系統(tǒng)監(jiān)控流程圖。12月24日至12月28日:分析文獻(xiàn)資料,完成開題報(bào)告。四、目標(biāo)、主要特色及工作進(jìn)度三、畢業(yè)設(shè)計(jì)(論文)工作內(nèi)容及完成時(shí)間:12月10日至12月16日:利用圖書館的數(shù)據(jù)庫資源,查閱國內(nèi)外相關(guān)文獻(xiàn)資料。系統(tǒng)通過PLC控制液位的高度,實(shí)現(xiàn)的方法是,通過液位傳感器把檢測(cè)到的信號(hào)變成相應(yīng)的電信號(hào)傳到PLC模擬輸入通道中,由PLC經(jīng)過PID算法計(jì)算得出的輸出信號(hào),經(jīng)過信號(hào)處理輸出到執(zhí)行器電動(dòng)調(diào)節(jié)閥中控制閥門的開度,使得液位達(dá)到指定的高度,這個(gè)過程需要一定的時(shí)間,輸出的信號(hào)和電動(dòng)調(diào)節(jié)閥的開度成正比,反之控制器參數(shù)選擇不合適,則會(huì)使得控制質(zhì)量變壞,達(dá)不到預(yù)期的效果,所以PID參數(shù)的選擇是很重要的,要很好的去整定,系統(tǒng)可以設(shè)定比例積分微分的參數(shù),觀察積分的效果,使用比例控制、比例積分控制和比例積分微分控制進(jìn)行試驗(yàn),將他們得到的結(jié)果進(jìn)行對(duì)比,就可以知道3個(gè)環(huán)節(jié)分別的作用系統(tǒng)的控制圖如圖2所示:其中SV給定信號(hào),由用戶通過計(jì)算機(jī)設(shè)定,PV為控制變量,它們的差是PID調(diào)節(jié)器的輸入偏差信號(hào),經(jīng)過PLC的PID運(yùn)算后輸出,調(diào)節(jié)器的輸出信號(hào)經(jīng)過PLC的D/A轉(zhuǎn)換成420ma的模擬電信號(hào)后輸出到電動(dòng)調(diào)節(jié)閥中調(diào)節(jié)閥的開度,以控制水的流量,使得水箱的液位保持設(shè)定值。經(jīng)過多年的發(fā)展,國內(nèi)PLC生產(chǎn)廠家約有三十家,但都沒有形成頗具規(guī)模的生產(chǎn)能力和名牌產(chǎn)品,更多廠家見附件1 研究內(nèi)容及實(shí)驗(yàn)初步方案目前采用的是水箱液位的PID調(diào)節(jié),有兩級(jí)水箱,如果控制一個(gè)水箱是單回路反饋PID控制。但是,按照Automation Research Corp的預(yù)測(cè),盡管全球經(jīng)濟(jì)下滑,PLC市場將會(huì)復(fù)蘇,估計(jì)全球PLC市場在2000年為76億美元,到2005年底將回到76億美元,并繼續(xù)略微增長3) 國內(nèi)外PLC的生產(chǎn)廠家全世界PLC生產(chǎn)廠家約200家,生產(chǎn)300多種產(chǎn)品。預(yù)計(jì)到2005年全國PLC需求
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