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可編程控制器的組成介紹（以FX2N系列PLC為例）

外部的開關信號、模擬信號以及各種傳感器檢測信號作為PLC的輸入變量，它們經PLC的輸入端子進入PLC的輸入存儲器，收集和暫存被控對象實際運行的狀態信息和數據；經PLC內部運算與處理后，按被控對象實際動作要求產生輸出結果；輸出結果送到輸出端子作為輸出變量，驅動執行機構。PLC的各部分協調一致地實現對現場設備的控制。

（1）中央處理器CPU

CPU的主要作用是解釋并執行用戶及系統程序，通過運行用戶及系統程序完成所有控制、處理、通信以及所賦予的其它功能，控制整個系統協調一致地工作。常用的CPU主要有通用微處理器、單片機和雙極型位片機。

（2）存儲器模塊

隨機存取存儲器RAM用于存儲PLC內部的輸入、輸出信息，并存儲內部繼電器（軟繼電器）、移位寄存器、數據寄存器、定時器／計數器以及累加器等的工作狀態，還可存儲用戶正在調試和修改的程序以及各種暫存的數據、中間變量等。

只讀存儲器ROM用于存儲系統程序�？刹脸�可編程序的只讀存儲器EPROM主要用來存放PLC的操作系統和監控程序，如果用戶程序已完全調試好，也可將程序固化在EPROM中。

（3）輸入輸出模塊

可編程序控制器是一種工業控制計算機系統，它的控制對象是工業生產過程，與DCS相似，它與工業生產過程的聯系也是通過輸入輸出接口模塊(I/O)實現的。I/O模塊是可編程序控制器與生產過程相聯系的橋梁。

PLC連接的過程變量按信號類型劃分可分為開關量（即數字量）、模擬量和脈沖量等，相應輸入輸出模塊可分為開關量輸入模塊、開關量輸出模塊、模擬量輸入模塊、模擬量輸出模塊和脈沖量輸入模塊等。

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