P0971WV DNBT ??P0971WV DNBT ??P0971WV DNBT ?
PLC問世以來，盡管時間不長，但發(fā)展迅速。為了使其生產(chǎn)和發(fā)展標(biāo)準(zhǔn)化，美國電氣制造商協(xié)會NEMA（National Electrical Manufactory Association）經(jīng)過四年的調(diào)查工作，于1984年首先將其正式命名為PC（Programmable Controller），并給PC作了如下定義：
聯(lián)?系?人：李素云???
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“PC是一個數(shù)字式的電子裝置，它使用了可編程序的記憶體儲存指令。用來執(zhí)行諸如邏輯，順序，計時，計數(shù)與演算等功能，并通過數(shù)字或類似的輸入/輸出模塊，以控制各種
機械或工作程序。一部數(shù)字電子計算機若是從事執(zhí)行PC之功能的，亦被視為PC，但不包括鼓式或類似的機械式順序控制器。”
以后國際電工委員會(IEC)又先后頒布了PLC標(biāo)準(zhǔn)的草案第一稿，第二稿,并在1987年2月通過了對它的定義：
“可編程控制器是一種數(shù)字運算操作的電子系統(tǒng)，專為在工業(yè)環(huán)境應(yīng)用而設(shè)計的。它采用一類可編程的存儲器，用于其內(nèi)部存儲程序，執(zhí)行邏輯運算,順序控制，定時，計數(shù)與算術(shù)操作等面向用戶的指令，并通過數(shù)字或模擬式輸入/輸出控制各種類型的機械或生產(chǎn)過程?？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)成一個整體，易于擴充其功能的原則設(shè)計。”
總之，可編程控制器是一臺計算機，它是專為工業(yè)環(huán)境應(yīng)用而設(shè)計制造的計算機。它具有豐富的輸入/輸出接口，并且具有較強的驅(qū)動能力。但可編程控制器產(chǎn)品并不針對某一具體工業(yè)應(yīng)用，在實際應(yīng)用時，其硬件需根據(jù)實際需要進行選用配置，其軟件需根據(jù)控制要求進行設(shè)計編制。
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