AB 1756-DNB
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(jì)算機(jī)（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(yùn)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(jì)，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(yùn)算、順序控制、定時/計(jì)數(shù)和算術(shù)運(yùn)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(jī)械或生產(chǎn)過程。PLC是微機(jī)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(jī)械觸點(diǎn)的接線復(fù)雜、可靠性低、功耗高、通用性和靈活性差的缺點(diǎn)，充分利用了微處理器的優(yōu)點(diǎn)，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(jì)算機(jī)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(shí)踐。
可編程序控制器一直在發(fā)展中，所以至今尚未對其下zui后的定義。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(biāo)準(zhǔn)草案的*，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(yùn)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(jì)。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(yùn)算、順序控制、定時、計(jì)數(shù)和算術(shù)運(yùn)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(jī)械或生產(chǎn)過程?？删幊绦蚩刂破骷捌溆嘘P(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(kuò)充其功能的原則設(shè)計(jì)。
廈門莫格電氣自動化有限公司
：張 美 霞
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IDEC * 100-240VAC 1.7A POWER SUPPLY * PS5R-SD24
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HAUG GMBH MULTISTAT POWER PACK FOR IONIZING UNIT 01.7759.000
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MITSUBISHI ELECTRIC POWER SUPPLY MODULE A61P 405J
INTERNATIONAL POWER 24VDC 7.2A DC POWER SUPPLY IHE24-7.2
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LAMARCHE PC BOARD P60-122 ECN6387
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