【正文】 根據(jù)抱閘電機的抱閘時間來設(shè)置進料電機的低速運行時的速度。建議使用該系統(tǒng)時先對系統(tǒng)的誤差進行校驗，當(dāng)誤差符合實際要求時再使用該系統(tǒng)。壓塊和剪切刀通過液壓系統(tǒng)控制，系統(tǒng)對液壓變量泵的控制要求不高，一般都處于額定運行狀態(tài)。光電開關(guān)的信號給板材計數(shù)器對板材進行計數(shù)同時光電開關(guān)的信號使PLC的高速計數(shù)器復(fù)位。為使剪板機的自動化程度更高，此次設(shè)計的板長和車載板數(shù)都可根據(jù)實際修改。由于缺乏實際經(jīng)驗和能力有限，此次設(shè)計還有諸多不足之處，尤其是在剪板機的工作效率方面。在以后的工作過程中我仍想致力于向PLC控制技術(shù)發(fā)展。謝辭在設(shè)計完成之際，我要特別感謝我的指導(dǎo)老師馬壯老師的熱情關(guān)懷和悉心指導(dǎo)。在我做設(shè)計和撰寫論文的過程中，馬老師傾注了大量的心血和汗水，無論是在論文的構(gòu)思和資料的收集方面還是在成文定稿方面，我都得到了馬老師悉心細(xì)致的教誨和無私的幫助。 在論文的寫作過程中，也得到了許多同學(xué)的寶貴建議，在此一并致以誠摯的謝意。感謝所有關(guān)心、支持、幫助過我的良師益友。 最后，向在百忙中抽出時間對本文進行評審并提出寶貴意見的各位老師表示衷心地感謝！參考文獻[1] (第3版)[M].北京:機械工業(yè)出版社,2008.[2] [M].北京:機械工業(yè)出版社,1996.[3] [M].北京:機械工業(yè)出版社,1997[4] [M].北京:化學(xué)工業(yè)出版社,2003.[5] [M].1989[6] 李清香,丁時峰,[J].機械設(shè)計與制造,2007(11):156~157.[7] 原魁,劉偉強,(第2版)[M].北京：冶金工業(yè)出版社,2005.[8] 齊占慶,[M].北京:機械工業(yè)出版社,2002.[9] 、應(yīng)用、實驗[M].北京:機械工業(yè)出版社,1997.[10] [M].北京北京航空航天大學(xué)出版社,2007.[11] [M].北京:機械工業(yè)出版社,2001.[12] 何利民,(第2版)[M].北京:中國建筑工業(yè)電力出版社,2002.[13] (第2版)[M].北京:中國輕工業(yè)出版社,2003.[14] 《工廠常用電氣設(shè)備手冊》(第2版)[M].北京:中國電力出版社,1998.[15] ,and ,PLC Tools: Design,Formal,Validation,and Code Generation for Programmable Controllers,Proceedings of the IEEE Conference on System,Man,and Cybernetics,.[16] ,Programming Industrial Control Systems Using IEC Publishing,.[17] 張玲．自動剪板機的PLC控制系統(tǒng)設(shè)計[J]．科技致富向?qū)?2010(5):82[18] 張志娟．PLC在自動剪板機中的精確定長裁剪方法[J]．機床電器,2010(3):2627附錄主程序：開始計數(shù)：中斷1中斷1：中斷2：中斷3：外文資料PLCs(programmable logical controller) face ever more plex challenges these days. Where once they quietly replaced relays and gave an occasional report to a corporate mainframe, they are now grouped into cells, given new jobs and new languages, and are force to pete against a growing array of control products . For this year’s annual PLC technology update, we queried PLC makers on these topics and more.Higher level PLC programming languages have been around for some time, but lately their popularity has been mushrooming. As Raymond Leveille, vice president amp。general manager, Siemens Energy amp。Automation, Inc., Programmable Controls Division, points out:” As programmable controls are being used for more and more dophisticated operations, languages other than ladder logic bee more practical, efficient, and powerful. For example, it’s very difficult to write a trigonometric function using ladder logic.” Languages gaining acceptance include Boolean, control system flowcharting, and such function chart languages as Graphcet and its variations. And there’s increasing interest in languages like C and BASIC.Thus far, PLCs have not been used extensively for continuous process control. Will this continue?” The feeling that I’ve gotten,” says Ken Jannotta, manager, product planning, Series One and Series Six prodects, at GEFanuc North America,” is that PLCs will be used in the process industry but not necessarily for process conrtol.”Several vendorsobviously betting that the opposite will happenhave introduce PLXs optimized for process applications. Rich Ryan, manager, mercial marketing, Allenbradly Programmable Controls Div., cites PLCs increasing use in such industries as food, chemical, and petroleun. Ryan feels there are two types of applications in which they’re appropriate.” one,” he says,” is where the size of the process control system that’s being automated doesn’t justify DCS[distributed control systems].With the starting price tags of those products being relatively high, a programmable controller makes sense for small, low loop count applications. The second is where you have to integrate the loop close with the sequential logic. Batch controllers are prime examples, where the sequence and maintaining the process variable are intertwined so closely that the benefits of having a programmable controller to do the sequential logic outweighs some of the disadvantages of not having a distributed control system.”Bill Barkovitz, president of Triconex, predicts that “all future controllers that e out in the process control system business will embrace a lot more PLC technology and a lot more PLC functionality than they ever did before.”Communications are vital to an individual automation cell and to the automated factory as a whole. We’ve heard a lot about MAP in the last few years, and a lot of panies have jumped on the bandwagon. Many, however, were disappointed when a fullydefined and pleted MAP specification didn’t appear immediately. Says Larry Komarek Right now, map is still a moving target for the manufacture, a specification that is not final. Presently, for example, people are introducing products to meet the MAP standard. Yet products will be obsolete when the new standard for is introduced.”Because of this, many PLC vendors are holding off on full MAP implementations. Omron, for example, has an ongoing MAPpatibility program。 but Frank New burn , vice president of Omron’s Industrial Division, reports that because of the lack of a film definition, Omron’s PLC don’t yet talk to MAP.Since it’s unlikely that an individual PLC would talk to broadband MAP anyway, makers are concentrating on proprietary networks. According to Sal Provanzano, user fear that if they do get on board and vendors withdraw form MAP, they will be the ones left holding a munications structure that’s not supported.While there are concerns about the lack of patible munications between PLCs from different vendors, the connection at the other end –the I/O –is even more fragmented. With rare exceptions, I/O is still proprietary. Yet there are those who feel that I/O will eventually bee more universal. GE Fanuc is hoping to do that with its Genius smart I/O line. The independent I/O makers are pulling in the same direction.Many say that I/O is such a highvalue item that PLC makers will always want to keep is propri