【正文】
所有設備都有缺點,大多數(shù)設備在錯誤的模式中度過了它們大部分的時間。與傳統(tǒng)的系統(tǒng)變動情況的耗時和昂貴相比,PLC的設計師提供了系統(tǒng)的內(nèi)置備用內(nèi)存儲量、備用I/O和一些備用多芯電纜向,多數(shù)的變動能迅速和相對便宜的完成,另一個好處是,所有的變化PLC都有記錄,程序的調(diào)試和修改不會因為沒有被記錄而遺失,這是一個經(jīng)常發(fā)生在常規(guī)系統(tǒng)中的問題。沒有任何設備在第一次就正常工作。PLC的程序多數(shù)在這個階段完成。下一階段是安裝,安裝是一種繁瑣和昂貴的工作,例如安裝傳感器、執(zhí)行器、限制開關系統(tǒng)和主機的連接。一個的PLC系統(tǒng)使用最簡單的標準件螺栓連接在一起。在這個階段輸入和輸出芯片十分便宜,所以可以內(nèi)置一個很健全的備用容量,它允許用來補充遺漏項目和為未來的擴充做準備。第一個階段是設計,對工廠的需要進行研究和制定控制策略,傳統(tǒng)的運行平臺的設計和制造必須在設計進行前完成。t because unrecorded lost. This is a regular system often happens in the problem. There is an additional fifth stage, maintenance, once started work, and hand over the production has produced maintenance. All equipment all have weaknesses, most equipment in the wrong mode spent much of their time. PLC system provides a very powerful tool to help diagnose failure.PLC的控制優(yōu)勢任何控制系統(tǒng)從概念到進入工廠工作都要經(jīng)歷四個階段。電氣自動化,2004(2),5556[9]周百聰,基于PLC的X62W型萬能銑床電控系統(tǒng)的改造,機電產(chǎn)品開發(fā)與創(chuàng)新, 2005(6),150151[10]邱公偉,可編程序控制器網(wǎng)絡通信及應用,北京清華大學出版社,2003, 15[11]李啟光,用PLC改造繼電器電氣線路中的技術研究,北京機械工業(yè)學院,2004(2),66-67 [12]李亞東,用PLC實現(xiàn)位置控制的方法,上海交通大學學報,2002(4),491493[13]王培良,發(fā)電機自動檢測的PLC電氣控制系統(tǒng),電氣自動化,2004(1),6061[14]李桂芹,提高PLC電氣控制系統(tǒng)可靠性的措施, 電氣自動化,2006(1),5758[15]梁首發(fā),PLC與工控機應用分析,工業(yè)儀表與自動化裝置,2001(1)4045[16]江梅,PLC在鏜銑床控制系統(tǒng)中的應用,冶金動力,2001(3)6264[17]王淑英,電器控制與PLC控制技術,機械工業(yè)出版社,2005(1)7579[18]陳在平、趙相賓,可編程控制器技術與應用系統(tǒng)設計,機械工業(yè)出版社,2002(6)134外文資料PLC control advantage Any control system from concept to enter factory work have to undergo four stages. PLC system in each stage has advantage. The first stage is designed to plant needs, study and formulate control strategy, the traditional operating platform design and manufacture must be finished before in design. PLC system just need is a vague about the size of the machine may idea and I/O number of requirements (much input and output interface). In this phase input and output chip very cheap, so can a builtin very sound reserve capacity, it allows used to supplement omission for future expansion project and prepare it. Secondly, the traditional design scheme is, eve