品牌:英維思 | 產地:美國 |
公司名稱:廈門仲鑫達自動化設備有限公司
聯係人:張玉(先生)
聯係電話:05925856210
聯係手機:18030132583
工作QQ :2516501928
電子郵箱:2516501928@qq.com
公司網址:http://www.zxdadsqc.com
傳真:0592-5165561(請備注“張玉”收)以便我及時聯係您!
地 址:廈 門 市 思 明 區 湖 光 大 廈 18 樓 A 單 元
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目前,上有200多廠家生產300多品種PLC產品,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。為了使各位初學者更方便地了解PLC,本文對PLC的發展、基本結構、配置、應用等基本知識作一簡介,以期對各位網友有所幫助。
一、PLC的發展歷程 在工業生產過程中,大量的開關量順序控制,它按照邏輯條件進行順序動作,並按照邏輯關係進行連鎖保護動作的控制,及大量離散量的數據採集。傳統上,這些功能是通過氣動或係統來實現的。1968年美國GM(通用汽車)公司提出取代繼電氣控制裝置的要求,第二年,美國數字公司研制出了基於集成電路和電子技術的控制裝置,採用程序化的手段應用於電氣控制,這就是第一代可編程序控制器,稱Programmable Controller(PC)。 個人計算機(簡稱PC)發展起來後,為了方便,也為了反映可編程控制器的功能特點,可編程序控制器定名為Programmable Logic Controller(PLC),現在,仍常常將PLC簡稱PC。 PLC的定義有許多種。國際電工委員會(IEC)對PLC的定義是:可編程控制器是一種數字運算操作的電子係統,專為在工業環境下應用而設計。它採用可編程序的存貯器,用來在其內部存貯執行邏輯運算、順序控制、定時、計數和算術運算等操作的指令,並通過數字的、模擬的輸入和輸出,控制各種類型的機械或生產過程。可編程序控制器及其有關設備,都應按易於與工業控制係統形成一個整體,易於擴充其功能的原則設計。 上世紀80年代至90年代中期,是PLC發展快的時期,年增長率一直保持為30~40%。在這時期,PLC在處理模擬量能力、數字運算能力、人機接口能力和網絡能力得到大幅度提高,PLC逐漸進入過程控制領域,在某些應用上取代了在過程控制領域處於統治地位的DCS係統。 PLC具有通用性強、使用方便、適應面廣、可靠性高、抗幹擾能力強、編程簡單等特點。PLC在工業自動化控制特別是順序控制中的地位,在可預見的將來,是無法取代的。
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