【正文】 K4復(fù)位繼電器Q037冷卻水壓力上限指示燈Q014Q040潤油壓力上限指示燈Q015Q041Q016Q042Q017Q043Q020自動指示燈Q044Q021手動指示燈Q045Q022加壓指示燈Q046Q023降壓指示燈Q047 程序流程圖 控制系統(tǒng)程序流程圖 部分控制程序如下：// 上電初始化，調(diào)用子程序LD CALL SBR0LD S , 1LD S ，1// 變頻器頻率上限時增開空壓機(jī)LD AD= VD250, VD208AN TON T37, 50// 符合增開條件時，工頻空壓機(jī)運(yùn)行數(shù)加1LD T37AB= VB301, 1EU= INCB VB301// 頻率下限時減開空壓機(jī)LDD= VD250, 1000AN TON T38, 30// 符合減開條件時，工頻機(jī)運(yùn)行數(shù)減1LD T38AB VB301, 0EU= DECB VB301// 變頻器復(fù)位LD O O = // 產(chǎn)生當(dāng)前空壓機(jī)工頻啟動脈沖信號LD T34EU= R , 1Network 17 LD S , 1Network 18 LD TON T39, 30Network 19 // 產(chǎn)生下一臺空壓機(jī)變頻運(yùn)行啟動信號LD T39EU= R , 1R , 1在山東省田莊煤礦實習(xí)一個多月，讓我了解了煤礦的生產(chǎn)流程、先后接觸了壓風(fēng)機(jī)、通風(fēng)機(jī)、變電所、提升系統(tǒng)等。在壓風(fēng)機(jī)房實習(xí)期間、找到壓風(fēng)機(jī)的各項技術(shù)參數(shù)，又上網(wǎng)學(xué)習(xí)了壓風(fēng)機(jī)的構(gòu)造和工作原理，溫習(xí)曾經(jīng)學(xué)過的PLC等課程，為畢業(yè)設(shè)計做準(zhǔn)備。在這半年的畢業(yè)設(shè)計當(dāng)中，我受益很多，畢業(yè)設(shè)計是對本科生的一個知識的總結(jié)過程，包含著很多需要我們學(xué)習(xí)的東西：綜合能力，畫圖能力，查閱文獻(xiàn)的能力，統(tǒng)籌編輯的能力等等。作為一個即將畢業(yè)的學(xué)生，我們應(yīng)該嚴(yán)肅的對待畢業(yè)設(shè)計。我在畢業(yè)設(shè)計中，聽從老師的指教，一步一個腳印的去做，不至于后期的慌亂。畢業(yè)設(shè)計讓我學(xué)會很多東西，把本科階段所學(xué)的理論知識綜合的應(yīng)用。加強(qiáng)了自己的理論知識，為今后的學(xué)習(xí)和工作打下了良好的基礎(chǔ)。畢業(yè)設(shè)計告訴我，在以后的工作和生活中，要堅持嚴(yán)謹(jǐn)認(rèn)真的態(tài)度、多了解所從事行業(yè)的知識和動態(tài)，才可能有所發(fā)展。 謝本文作者在初期準(zhǔn)備（包括在田莊煤礦的實習(xí)）期間，了解了田莊煤礦壓風(fēng)機(jī)房的各項資料，又閱讀和參考了有關(guān)PLC以及空壓機(jī)的相關(guān)書籍。在指導(dǎo)教師和同學(xué)們的幫助下，將所學(xué)到的理論知識與相關(guān)控制系統(tǒng)相結(jié)合，終于設(shè)計出了基于PLC的煤礦空壓機(jī)控制系統(tǒng)。但是由于時間的關(guān)系，控制系統(tǒng)還有很多可以完善的地方都沒有進(jìn)行進(jìn)一步完善。本人所能做到的就是將設(shè)計基于PLC的煤礦空壓機(jī)控制系統(tǒng)過程中的經(jīng)驗和教訓(xùn)記錄下來。因此，在設(shè)計及論述過程中難免有錯誤和不妥之處，敬請各位老師和同學(xué)批評指正。在此期間，指導(dǎo)老師隋濤老師給予了我很大的幫助，為我提供了不少參考資料、設(shè)計建議和改進(jìn)思路，從而使我能順利的完成這次畢業(yè)設(shè)計，所以在此表示深深的謝意。最后還要向文中引用到其學(xué)術(shù)論著及研究成果的眾多學(xué)者前輩與同行鳴謝，也感謝將為本文審稿的所有老師，你們提出的寶貴意見將使我受益匪淺!9．附錄 系統(tǒng)圖紙 外文文獻(xiàn)翻譯Programmable logic controllerA programmable logic controller (PLC) or programmable controller is a digital puter used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or lighting fixtures. PLCs are used in many industries and machines. Unlike generalpurpose puters, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in batterybacked or nonvolatile memory. A PLC is an example of a real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result. The PLC was invented in response to the needs of the American automotive manufacturing industry. Programmable logic controllers were initially adopted by the automotive industry where software revision replaced the rewiring of hardwired control panels when production models changed. Before the PLC, control, sequencing, and safety interlock logic for manufacturing automobiles was acplished using hundreds or thousands of relays, cam timers, and drum sequencers and dedicated closedloop controllers. The process for updating such facilities for the yearly model changeover was very time consuming and expensive, as electricians needed to individually rewire each and every relay. In 1968 GM Hydramatic (the automatic transmission division of General Motors) issued a request for proposal for an electronic replacement for hardwired relay systems. The winning proposal came from Bedford Associates of Bedford, Massachusetts. The first PLC, designated the 084 because it was Bedford Associates39。 eightyfourth project, was the result. Bedford Associates started a new pany dedicated to developing, manufacturing, selling, and servicing this new product: Modicon, which stood for MOdular DIgital CONtroller. One of the people who worked on that project was Dick Morley, who is considered to be the father of the PLC. The Modicon brand was sold in 1977 to Gould Electronics, and later acquired by German Company AEG and then by French Schneider Electric, the current owner. One of the very first 084 models built is now on display at Modicon39。s headquarters in North Andover, Massachusetts. It was presented to Modicon by GM, when the unit was retired after nearly twenty years of uninterrupted service. Modicon used the 84 moniker at the end of its product range until the 984 made its appearance. The automotive industry is still one of the largest users of PLCs. Early PLCs were designed to replace relay logic systems. These PLCs were programmed in ladder logic, which strongly resembles a schematic diagram of relay logic. This program notation was chosen to reduce training demands for the existing technicians. Other early PLCs used a form of instruction list programming, based on a stackbased logic solver. Modern PLCs can be programmed in a variety of ways, from ladder logic to more traditional programming languages such as BASIC and C. Another method is State Logic, a very highlevel programming language designed to program PLCs based on state transition diagrams. Many early PLCs did not have acpanying programming terminals that were capable of graphical representation of the logic, and so the logic was instead represented as a series of logic expressions in some version of Boolean format, similar to Boolean algebra. As programming terminals evolved, it became more mon for ladder logic to be used, for the aforementioned reasons. Newer formats such as State Logic and Function Block (which is similar to the way logic is depicted when using digital integrated logic circuits) exist, but they are still not as popular as ladder logic. A primary reason for this is that PLCs solve the logic in a predictable and repeating sequence, and ladder logic allows the programmer (the person writing the logic) to see any issues with the timing of the logic sequence more easily than would be possible in other formats. Early PLCs, up to the mid1980s, were programmed using proprietary programming panels or s