PLC的研究歷程和發(fā)展方向發(fā)布時間：12-11-25 來源： 點擊量：47437 更多
MDD093A-N-060-N2L-110GA0可編程序控制器的英文為Programmable Controller，在二十實際七十至八十年代一直簡稱為PC。由于到90年代，個人計算機發(fā)展起來，也簡稱為PC;加之可編程序的概念MDD093A-N-060-N2L-110GA0所涵蓋的范圍太大，所以美國AB公司首次將可編程序控制器定名為可編程序邏輯控制器(PLC，Programmable Logic Controller)，為了方便，仍簡稱PLC為可編程序控制器。有人把可編程序控制器組成的系統(tǒng)稱為PCS可編程序控制系統(tǒng)，強調可編程序控制器生產廠商向人們提供的已是完整的系統(tǒng)了。
PLC的發(fā)展和市場情況
1968年美國GM(通用汽車)公司提出取代繼電器控制裝置的要求，MDD093A-N-060-N2L-110GA0第二年美國數字公司研制出了第一土改可編程序控制器，滿足了GM公司裝配線的要求。隨著集成電路技術和計算機技術的發(fā)展，現在已有第五代PLC產品了。
MDD093A-N-060-N2L-110GA0在以改變幾何形狀和機械性能為特征的制造工業(yè)和以物理變化和化學變化將原料轉化成產品為特征的過程工業(yè)中，除了以連續(xù)量為主的反饋控制外，特別在制造工業(yè)中存在了大量的開關量為主的開環(huán)的順序控制，它按照邏輯條件進行順序動作號按照時序動作;另外還有與順序、時序無關的按照邏輯關系進行連鎖保護動作的控制;以及大量的開關量、脈沖量、計時、計數器、模擬量的越限報警等狀態(tài)量為主的——離散量的數據采集監(jiān)視。由于這些控制和監(jiān)視的要求，所以PLC發(fā)展成了取代繼電器線路和進行順序控制為主的產品。在多年的生產實踐中，逐漸形成了PLC、DCS與IPC三足鼎立之勢，如表1，還有其它的單回路智能式調節(jié)器等在市場上占有一定的百分比。
MDD093A-N-060-N2L-110GA0在八十年代至九十年代中期，是PLC發(fā)展最快的時期，年增長率一直保持為30~40%。由于PLC人機聯(lián)系處理模擬能力和網絡方面功能的進步，擠占了一部分DCS的市場(過程控制)并逐漸壟斷了污水處理等行業(yè)，但是由于工業(yè)PC(IPC)的出現，特別是近年來現場總線技術的發(fā)展，IPC和FCS也擠占了一部分PLC市場，所以近年來PLC增長速度總的說是漸緩。目前全世界有200多廠家生產300多品種PLC產品，主要應用在汽車(23%)、糧食加工(16.4%)、化學/制藥(14.6%)、金屬/礦山(11.5%)、紙漿/造紙(11.3%)等行業(yè)。
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MDD071C-N-030-N2S-095GB0
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