A06B-6151-H075#H580
A06B-6151-H075#H580
A06B-6151-H075#H580
什么是PLC，可編程序控制器的定義
可編程序控制器，英文稱Programmable Controller，簡稱PC。但由于PC容易和個人計算機（Personal Computer）混淆，故人們?nèi)粤?xí)慣地用PLC作為可編程序控制器的縮寫。它是一個以微處理器為核心的數(shù)字運算操作的電子系統(tǒng)裝置，專為在工業(yè)現(xiàn)場應(yīng)用而設(shè)計，它采用可編程序的存儲器，用以在其內(nèi)部存儲執(zhí)行邏輯運算、順序控制、定時/計數(shù)和算術(shù)運算等操作指令，并通過數(shù)字式或模擬式的輸入、輸出接口，控制各種類型的機械或生產(chǎn)過程。PLC是微機技術(shù)與傳統(tǒng)的繼電接觸控制技術(shù)相結(jié)合的產(chǎn)物，它克服了繼電接觸控制系統(tǒng)中的機械觸點的接線復(fù)雜、可靠性低、功耗高、通用性和靈活性差的缺點，充分利用了微處理器的優(yōu)點，又照顧到現(xiàn)場電氣操作維修人員的技能與習(xí)慣，特別是PLC的程序編制，不需要專門的計算機編程語言知識，而是采用了一套以繼電器梯形圖為基礎(chǔ)的簡單指令形式，使用戶程序編制形象、直觀、方便易學(xué)；調(diào)試與查錯也都很方便。用戶在購到所需的PLC后，只需按說明書的提示，做少量的接線和簡易的用戶程序編制工作，就可靈活方便地將PLC應(yīng)用于生產(chǎn)實踐。
可編程序控制器一直在發(fā)展中，所以至今尚未對其下最后的定義。國際電工學(xué)會（IEC）曾先后于1982.11；1985.1和1987.2發(fā)布了可編程序控制器標準草案的第一，二，三稿。
在第三稿中，對PLC作了如下定義：可編程序控制器是一種數(shù)字運算操作電子系統(tǒng)，專為在工業(yè)環(huán)境下應(yīng)用而設(shè)計。它采用了可編程序的存儲器，用來在其內(nèi)部存儲執(zhí)行邏輯運算、順序控制、定時、計數(shù)和算術(shù)運算等操作的指令，并通過數(shù)字的，模擬的輸入和輸出，控制各種類型的機械或生產(chǎn)過程。可編程序控制器及其有關(guān)的外圍設(shè)備，都應(yīng)按易于與工業(yè)控制系統(tǒng)形成一個整體、易于擴充其功能的原則設(shè)計。
定義強調(diào)了PLC是：1 數(shù)字運算操作的電子系統(tǒng)——也是一種計算機
2 專為在工業(yè)環(huán)境下應(yīng)用而設(shè)計
3 面向用戶指令——編程方便
4 邏輯運算、順序控制、定時計算和算術(shù)操作
5 數(shù)字量或模擬量輸入輸出控制
6 易與控制系統(tǒng)聯(lián)成一體
7 易于擴充
福州卓凱電子科技有限公司聯(lián)系人：林工
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