可編程邏輯控制器(Programmable Logic Controller,簡(jiǎn)稱PLC),一種具有微處理機(jī)的數(shù)字電子設(shè)備,用于
自動(dòng)化控制的數(shù)字邏輯控制器,可以將控制指令隨時(shí)加載內(nèi)存內(nèi)儲(chǔ)存與執(zhí)行?删幊炭刂破饔蓛(nèi)部
CPU,指令及資料內(nèi)存、輸入輸出單元、電源模組、數(shù)字模擬等單元所模組化組合成。
廣泛應(yīng)用于工業(yè)控制領(lǐng)域。在可編程邏輯控制器出現(xiàn)之前,一般要使用成百上千的
繼電器以及計(jì)數(shù)器才能組成具有相同功能的自動(dòng)化系統(tǒng),而現(xiàn)在,經(jīng)過(guò)編程的簡(jiǎn)單的可編程邏輯控制器模塊基本上已經(jīng)代替了這些大型裝置?删幊踢壿嬁刂破鞯南到y(tǒng)程序一般在出廠前已經(jīng)初始化完畢,用戶可以根據(jù)自己的需要自行編輯相應(yīng)的用戶程序來(lái)滿足不同的自動(dòng)化生產(chǎn)要求。
最初的可編程邏輯控制器只有電路邏輯控制的功能,所以被命名為可編程邏輯控制器,后來(lái)隨著不斷的發(fā)展,這些當(dāng)初功能簡(jiǎn)單的計(jì)算機(jī)模塊已經(jīng)有了包括
邏輯控制,
時(shí)序控制、模擬控制、多機(jī)通信等許多的功能,名稱也改為可編程控制器(Programmable Controller),但是由于它的簡(jiǎn)寫(xiě)也是PC與個(gè)人電腦(Personal Computer )的簡(jiǎn)寫(xiě)相沖突,也由于多年來(lái)的使用習(xí)慣,人們還是經(jīng)常使用可編程邏輯控制器這一稱呼,并在術(shù)語(yǔ)中仍沿用PLC這一縮寫(xiě)
丁巳重陽(yáng)前三日,夢(mèng)亡婦淡妝素服,執(zhí)手哽咽。語(yǔ)多不復(fù)能。但臨別有云:“銜恨愿為天上月,年年猶得向郎圓”。婦素未工詩(shī),不知何以得此也。覺(jué)后感賦長(zhǎng)調(diào):
瞬息浮生,薄命如斯,低徊怎忘?記繡榻閑時(shí),并吹紅雨,雕闌曲處,同倚斜陽(yáng)。夢(mèng)好難留,詩(shī)殘莫續(xù),贏得更深哭一場(chǎng)。遺容在,只靈飆一轉(zhuǎn),未許端詳。
重尋碧落茫茫,料短發(fā),朝來(lái)定有霜。便人間天上,塵緣未斷,春花秋葉,觸緒還傷。欲結(jié)綢繆,翻驚搖落,減盡荀衣昨日香。真無(wú)奈,倩聲聲鄰笛,譜出回腸。
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