104X905BA603 104X905BA603 104X905BA603
PLC問(wèn)世以來(lái),盡管時(shí)間不長(zhǎng),但發(fā)展迅速。為了使其生產(chǎn)和發(fā)展標(biāo)準(zhǔn)化,***際電工委員會(huì)(IEC) 后頒布了PLC標(biāo)準(zhǔn)的草案 稿, 二稿,并在1987年2月通過(guò)了對(duì)它的定義:
“可編程控制器是 種數(shù)字運(yùn)算操作的電子系統(tǒng),專為在工業(yè)環(huán)境應(yīng)用而設(shè)計(jì)的。它采用 類可編程的存儲(chǔ)器,用于其內(nèi)部存儲(chǔ)程序,執(zhí)行邏輯運(yùn)算、順序控制、定時(shí)、計(jì)數(shù)與算術(shù)操作等面向用戶的指令,并通過(guò)數(shù)字或模擬式輸入/輸出控制各種類型的機(jī)械或生產(chǎn)過(guò)程??删幊炭刂破骷捌溆嘘P(guān)外部設(shè)備,都按易于與工業(yè)控制系統(tǒng)聯(lián)成 個(gè)整體,易于擴(kuò)充其功能的原則設(shè)計(jì)。”
為了避免與個(gè)人計(jì)算機(jī)PC(Personal Computer)相混淆,所以改為PLC(Programmable Logic Controller)即可編程邏輯控制器,但從功能上講,現(xiàn)在的PLC早已不是原來(lái)意義上的“PLC”了。
總之,可編程控制器是 臺(tái)計(jì)算機(jī),它是專為工業(yè)環(huán)境應(yīng)用而設(shè)計(jì)制造的計(jì)算機(jī)。它具有豐富的輸入、輸出接口,并且具有較強(qiáng)的驅(qū)動(dòng)能力。但可編程控制器產(chǎn)品并不針對(duì)某 具體工業(yè)應(yīng)用,在實(shí)際應(yīng)用時(shí),其硬件需根據(jù)實(shí)際需要進(jìn)行選用配置,其軟件需根據(jù)控制要求進(jìn)行設(shè)計(jì)編制。
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廈門(mén)莫格電氣自動(dòng)化
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