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PLC對社會的作用和影響
　　近10年來，我國的PLC研制、生產、應用也發展很快。特別是在應用方面，在引進一些成套設備的同時，也配套引進不少PLC。如上海寶剛**期工程，就采用了250臺，第二期也采用了108臺。又如天津化纖廠、秦川電站、北京吉普車生產線、西安的彩電和冰箱生產線等等都采用了PLC控制。總之，我國PLC的應用已獲得令人矚目的經濟效益和社會效益。
（1） 什么是PLC？
　　20世紀70年代后期，隨著微電子技術和計算機技術的迅猛發展，可編程序邏輯控制器更多地具有計算機功能，不僅用邏輯編程取代硬接線邏輯，還增加了運算、數據傳送和處理等功能，真正成為一種電子計算機工業控制裝置，而且做到了小型化和超小型化。這種采用微電腦技術的工業控制裝置的功能遠遠超出邏輯控制、順序控制的范圍，故稱為可編程序控制器，簡稱PC。但由于PC容易和個人計算機混淆，故人們仍習慣地用PLC作為可編程序控制器的縮寫
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