可編程序控制器(Programmable Controller)原本應(yīng)簡稱PC，為了與個(gè)人計(jì)算機(jī)專稱PC相區(qū)別，所以可編程序控制器簡稱定為PLC(Programmable Logic Controller)，但并非說PLC只能控制邏輯信號。PLC是專門針對工業(yè)環(huán)境應(yīng)用設(shè)計(jì)的，自帶直觀、簡單并易于掌握編程語言環(huán)境的工業(yè)現(xiàn)場控制裝置。

　　PLC的基本組成

　　PLC基本組成包括中央處理器(CPU)、存儲器、輸入/輸出接口(縮寫為I/O，包括輸入接口、輸出接口、外部設(shè)備接口、擴(kuò)展接口等)、外部 設(shè)備編程器及電源模塊組成，見圖1。PLC內(nèi)部各組成單元之間通過電源總線、控制總線、地址總線和數(shù)據(jù)總線連接，外部則根據(jù)實(shí)際控制對象配置相應(yīng)設(shè)備與控 制裝置構(gòu)成PLC控制系統(tǒng)。

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