赫斯曼 RS2-FX/FX
CPU模塊中的存儲器
存儲器分為系統(tǒng)程序存儲器和用戶程序存儲器,系統(tǒng)程序相當于個人計算機中的操作系統(tǒng),它使PLC具有基本的智能,能完成PLC設計者的規(guī)定的各種工作。系統(tǒng)程序由PLC的生廠家設計并固定化在ROM(只讀存儲器)中,用戶不能讀取。用戶程序由用戶設計,它使PLC能完成用戶要球的特定功能,用戶程序存儲器的容量以字節(jié)(B)為單位。
(1).隨機存取存儲器(RAM)
用戶可以用編程裝置讀出RAM中的內(nèi)容,也可以將用戶程序寫入RAM,因此RAM又叫讀/寫存儲器。RAM的工作速度高、價格便宜、改寫方便。
(2).只讀存儲器(ROM)
ROM的內(nèi)容只能讀出,不能寫入。
(3).可以電檫出可編程的只讀存儲器(EEPROM)
S7-200用EEPROM來存儲用戶程序和長期保存的重要數(shù)據(jù)。
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