【正文】 義且可重復(fù)使用，并且可集　　中進行更改　　動態(tài)面板　　可組態(tài)智能工具，如：圖形導(dǎo)航和圖形化運動對象，　　可方便地組態(tài)大批量數(shù)據(jù)（如，變量編輯器）等　　利用用戶 ID 和密碼實現(xiàn)訪問保護　　配方管理　　報表系統(tǒng)　　為全球推廣提供語言支持：　　在一個項目中管理 32 種語言　　支持多語言文本和自動翻譯的文本庫　　文本的導(dǎo)入/導(dǎo)出過程十分簡單，從而便于翻譯　　個性化擴展選件：　　Sm@rt客戶端/服務(wù)器概念　　通過 Internet 進行服務(wù)與診斷　　OPC 服務(wù)器通訊過程診斷記錄和跟蹤操作員動作和組態(tài) 通訊連接上位機與PLC通過MPI連接，給每臺PLC站點賦予不同的地址。 系統(tǒng)通訊示意圖 人機界面根據(jù)設(shè)計要求，界面得設(shè)計實時監(jiān)控面板、控制畫面、報警畫面，要求界面形象、生動、美觀。每個大棚設(shè)置一個手動按鈕和一個自動按鈕，按下手動按鈕時手動操作同時跳到相應(yīng)大棚手動控制畫面，按下自動按鈕后自動操作跳到自動操作畫面。 控制選擇畫面跳到手動畫面時為手動操作，按下按鈕執(zhí)行相應(yīng)操作。 手動控制畫面跳到實時監(jiān)控時為自動控制，溫度濕度值為下位檢測到的數(shù)據(jù)，溫濕度上下限可在上位修改。 自動監(jiān)控畫面結(jié) 論整個設(shè)計報告思路，首先講述了溫室大棚的一般概況及工作原理；其次講述了溫室大棚自動控制的工作原理及硬件系統(tǒng)和組成；第三論述溫室大棚的系統(tǒng)硬件的設(shè)計與研究，及其硬件各系統(tǒng)的作用；第四講述軟件系統(tǒng)的設(shè)計方案；最后總結(jié)在設(shè)計中得到的寶貴經(jīng)驗及發(fā)現(xiàn)發(fā)現(xiàn)的問題。溫室大棚自動控制系統(tǒng)是近年來逐步發(fā)展起來的一種資源節(jié)約型高效農(nóng)業(yè)發(fā)展技術(shù)，它是在普通日光溫室的基礎(chǔ)上，結(jié)合現(xiàn)代化計算機自控技術(shù)、智能傳感技術(shù)等高科技手段發(fā)展起來的。溫室控制主要是根據(jù)外界環(huán)境的溫度、濕度等氣候因素，來控制溫室內(nèi)的溫度、濕度，創(chuàng)造出適合作物生長的最佳環(huán)境。在這種控制中，溫度、濕度等被控量之間存在著強烈的相互關(guān)系，某個被控量的改變，會影響到其他被控量的變化。所以對這些參數(shù)的控制是至關(guān)重要的。本控制系統(tǒng)由西門子S7300 PLC，溫度檢測電路，濕度檢測電路、控制系統(tǒng)組成?，F(xiàn)場控制柜由手動操作，遠程控制分為手動控制和自動操作，溫度檢測電路將檢測到的溫度轉(zhuǎn)換成電壓信號，PLC通過比較輸入溫度與設(shè)定溫度來控制卷簾系統(tǒng)電路，當棚內(nèi)溫度在設(shè)定范圍內(nèi)時，PLC不對卷簾設(shè)備發(fā)出動作。下位程序通過step7編程實現(xiàn)。上位用wincc flexible。通過不斷調(diào)試，最終達到上下位連調(diào)。溫室環(huán)境控制的目的是把各被控變量(溫室大棚環(huán)境因子)，如溫度、濕度等，維持在作物生長發(fā)育要求的范圍內(nèi)。該設(shè)計還具有對溫室大棚內(nèi)環(huán)境溫度、濕度的預(yù)設(shè)功能。溫室環(huán)境控制系統(tǒng)正在不斷吸收相關(guān)領(lǐng)域新的理論和方法，結(jié)合溫室作物種植的特點，不斷創(chuàng)新，逐步完善。我相信在不斷的發(fā)現(xiàn)在問題、解決問題中中國的溫室產(chǎn)業(yè)將走上更加輝煌的道路。致謝行文至此，我的這篇論文已接近尾聲；歲月如梭，我四年的大學時光也即將敲響結(jié)束的鐘聲。離別在即，站在人生的又一個轉(zhuǎn)折點上，心中難免思緒萬千，一種感恩之情油然而生。生我者父母。感謝生我養(yǎng)我，含辛茹苦的父母。是你們，為我的學習創(chuàng)造了條件；是你們，一如既往的站在我的身后默默的支持著我。沒有你們就不會有我的今天。謝謝你們，我的父親母親！在這四年中，老師的諄諄教導(dǎo)、同學的互幫互助使我在專業(yè)技術(shù)和為人處事方面都得到了很大的提高。感謝蘭州理工大學在我四年的大學生活當中對我的教育與培養(yǎng)，感謝蘭州理工大學電信學院的所有專業(yè)老師，沒有你們的辛勤勞動，就沒有我們今日的滿載而歸，感謝大學四年曾經(jīng)幫助過我的所有同學。在制作畢業(yè)設(shè)計過程中我曾經(jīng)向老師們和同學們請教過不少的問題，老師們的熱情解答和同學們的熱心幫助才使我的畢業(yè)設(shè)計能較為順利的完成。在此我向你們表示最衷心的感謝。參考文獻[1][J].農(nóng)業(yè)裝備技術(shù)，2004,30(6):79.[2][J].傳感器世界，2002,8(2):811.[3]王風云，尚明華，[J].山東農(nóng)業(yè)科學，2005(5):6365.[4] [M].北京：機械工業(yè)出版社[M].2009[5] Programming with STEP 7 [M]. [6] [M].北京：機械工業(yè)出版社[M].2009[7] 崔堅. [M].2005 [8][J].農(nóng)村機械化，1998(4）:78.[9] 劉鍇，周海，深入淺出西門子S7300 PLC [M]. 北京航空航天大學出版 社:2005(8):153174[10]朱偉興，[J] .農(nóng)業(yè)工程學: 報,1999,15(4):162166.[11][J].溫室園藝,2003(11):2425.[12]李莉，[J].農(nóng)業(yè)機械學報,2007,38(2):195200.[13]左志宇，毛罕平，[J].農(nóng)機化研究，2003(4):104107.[14]李迎霞，[J].農(nóng)業(yè)工程學報，2004,20(2)：267272.[15] 高鴻斌，孔美靜，赫孟合. 西門子PLC與工業(yè)控制網(wǎng)絡(luò)應(yīng)用[M].電子工業(yè)出版社,2006.[16][17]張志峰，王堅，趙靜..現(xiàn)場總線ProfibusDP2004(4):3537.外文翻譯外文原文ONE、PLC overview Programmable controller is the first in the late 1960s in the United States, then called Plc programmable logic controller (Programmable Logic Controller) is used to replace relays. For the implementation of the logical judgment, timing, sequence number, and other control functions. The concept is presented Plc General Motors Corporation. Plc and the basic design is the puter functional improvements, flexible, generic and other advantages and relay control system simple and easy to operate, such as the advantages of cheap prices bined controller hardware is standard and overall. According to the practical application of target software in order to control the content of the user procedures memory controller, the controller and connecting the accused convenient target.In the mid1970s, the Plc has been widely used as a central processing unit microprocessor, import export module and the external circuits are used, largescale integrated circuits even when the Plc is no longer the only logical (IC) judgment functions also have data processing, PID conditioning and data munications functions. International Electro technical Commission (IEC) standards promulgated programmable controller for programmable controller draft made the following definition : programmable controller is a digital electronic puters operating system, specifically for applications in the industrial design environment. It used programmable memory, used to implement logic in their internal storage operations, sequence control, timing, counting and arithmetic operations, such as operating instructions, and through digital and analog input and output, the control of various types of machinery or production processes. Programmable controller and related peripherals, and industrial control systems easily linked to form a whole, to expand its functional design. Programmable controller for the user, is a noncontact equipment, the procedures can be changed to change production processes. The programmable controller has bee a powerful tool for factory automation, widely popular replication. Programmable controller is useroriented industries dedicated control puter, with many distinctive features.First, high reliability, antiinterference capability。Second，programming visual, simple。Third, adaptability good。Fourth functional improvements, strong functional interface.TWO、History of PLCProgrammable Logic Controllers (PLC), a puting device invented by Richard E. Morley in 1968, have been widely used in industry including manufacturing systems, transportation systems, chemical process facilities, and many others. At that time, the PLC replaced the hardwired logic with softwired logic or socalled relay ladder logic (RLL), a programming language visually resembling the hardwired logic, and reduced thereby the configuration time from 6 months down to 6 days [Moody and Morley, 1999].Although PC based control has started to e into place, PLC based control will remain the technique to which the majority of industrial applications will adhere due to its higher performance, lower price, and superior reliability in harsh environments. Moreover, according to a study on the PLC market of Frost and Sullivan [1995], an increase of the annual sales volume to 15 million PLCs per year with the hardware value of more than 8 billion US dollars has been predicted, though the prices of puting hardware is steadily dropping. The inventor of the PLC, Richard E Morley, fairly considers the PLC market as a 5billion industry at the present time.Though PLCs are widely used in industrial practice, the programming of PLC based control systems is still very much relying on trialanderror. Alike software engineering, PLC software design is facin