美國(guó)AB模塊
可編程序控制器(Programmable Controller)原本應(yīng)簡(jiǎn)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(jiǎn)稱定為PLC(Programmable Logic Controller)，但并非說(shuō)PLC只能控制邏輯信號(hào)。PLC是專門針對(duì)工業(yè)環(huán)境應(yīng)用設(shè)計(jì)的，自帶直觀、簡(jiǎn)單并易于掌握編程語(yǔ)言環(huán)境的工業(yè)現(xiàn)場(chǎng)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(chǔ)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(jiàn)圖1。PLC內(nèi)部各組成單元之間通過(guò)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(duì)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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