IC200ALG230 主機(jī)部分包括*處理器（CPU）、系統(tǒng)程序存儲(chǔ)器和用戶程序及數(shù)據(jù)存儲(chǔ)器。CPU是PLC的核心，它用以運(yùn)行用戶程序、監(jiān)控輸入/輸出接口狀態(tài)、作出邏輯判斷和進(jìn)行數(shù)據(jù)處理，即讀取輸入變量、完成用戶指令規(guī)定的各種操作，將結(jié)果送到輸出端，并響應(yīng)外部設(shè)備（如電腦、打印機(jī)等）的請求以及進(jìn)行各種內(nèi)部判斷等。PLC的內(nèi)部存儲(chǔ)器有兩類，一類是系統(tǒng)程序存儲(chǔ)器，主要存放系統(tǒng)管理和監(jiān)控程序及對用戶程序作編譯處理的程序，系統(tǒng)程序已由廠家固定，用戶不能更改；另一類是用戶程序及數(shù)據(jù)存儲(chǔ)器，主要存放用戶編制的應(yīng)用程序及各種暫存數(shù)據(jù)和中間結(jié)果。

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