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1756-L55M12

1756-L55M12

1756-L55M12

 PLC內存有用戶及系統(tǒng)兩大部分。用戶內存主要用以存儲用戶程序，個別的還將其中的一部分劃為系統(tǒng)所用。系統(tǒng)內存是與CPU配置在一起的。CPU既要具備訪問這些內存的能力，還應提供相應的存儲介質。 

   用戶內存大小與可存儲的用戶程序量有關。內存大，可存儲的程序量大，也就可進行更為復雜的控制。從發(fā)展趨勢看，內存容量總是在不斷增大著。大型PLC的內存容量可達幾十k，以至于一百多k。系統(tǒng)內存對于用戶，主要體現(xiàn)在PLC能提供多少內部器件。不同的內部器件占據(jù)系統(tǒng)內存的不同區(qū)域。在物理上并無這些器件，僅僅為RAM。但通過運行程序進行使用時，給使用者提供的卻實實在在有這些器件。 現(xiàn)貨，現(xiàn)貨，降降降，火火火，火火火……
現(xiàn)貨，現(xiàn)貨，降降降，火火火，火火火……
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