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103620

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103620

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，故人們仍習慣地用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字運算操作的電子系統裝置，專為在工業現場應用而設計，它采用可編程序的存儲器，用以在其內部存儲執行邏輯運算、順序控制、定時/計數和算術運算等操作指令，并通過數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過程。PLC是微機技術與傳統的繼電接觸控制技術相結合的產物，它克服了繼電接觸控制系統中的機械觸點的接線復雜、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點，又照顧到現場電氣操作維修人員的技能與習慣，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的簡單指令形式，使用戶程序編制形象、直觀、方便易學；調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應用于生產實踐。

可編程序控制器一直在發展中，所以至今尚未對其下最后的定義。國際電工學會（IEC）曾先后于1982.11；1985.1和1987.2發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字運算操作電子系統，專為在工業環境下應用而設計。它采用了可編程序的存儲器，用來在其內部存儲執行邏輯運算、順序控制、定時、計數和算術運算等操作的指令，并通過數字的，模擬的輸入和輸出，控制各種類型的機械或生產過程。可編程序控制器及其有關的外圍設備，都應按易于與工業控制系統形成一個整體、易于擴充其功能的原則設計。

定義強調了PLC是：1 數字運算操作的電子系統——也是一種計算機

                  2 專為在工業環境下應用而設計

                  3 面向用戶指令——編程方便

                  4 邏輯運算、順序控制、定時計算和算術操作

                  5 數字量或模擬量輸入輸出控制

                  6 易與控制系統聯成一體

                  7 易于擴充

福州卓凱電子科技有限公司聯系人：林工
24小時咨詢熱線：17705012279

TEL：0591-22989937
QQ：879520885

傳真：0591-22989937
公司地址：福州市閩侯西江濱大道77號正榮潤園一號樓1205室
產品價格以電話或者QQ詢價為準，發布價格及圖片不做參考

ALLEN-BRADLEY MEMORY BOARD 8000-MB / 900052 REV. 6

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