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6SE7023-4TC84-1HF3湖北咸寧
6SE7023-4TC84-1HF3湖北咸寧
系統(tǒng)程序存儲器——存放系統(tǒng)工作程序（監(jiān)控程序）、模塊化應(yīng)用功能子程序、命令
解釋、功能子程序的調(diào)用管理程序和系統(tǒng)參數(shù)
*不能由用戶直接存取
用戶存儲器 用戶程序存儲器——存放用戶程序。即用戶通過編程器輸入的用
戶程序。
功能存儲器（數(shù)據(jù)區(qū)）——存放用戶數(shù)據(jù)
PC的用戶存儲器通常以字（16位/字）為單位來表示存儲容量。
注意：系統(tǒng)程序直接關(guān)系到PC的性能，不能由用戶直接存取，所以，通常PC產(chǎn)品資料中
所指的存儲器形式或存儲方式及容量，是指用戶程序存儲器而言。
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