140DDI15310 Quantum

140DDI15310

為什么在某些情況下，保留區會被重寫

在 STEP7 的硬件組態中，可以把幾個操作數區定義為“保留區”。這樣可以在掉電以后，即使沒有備份電池的話，仍能保持這些區域中的內容。如果定義一個

塊為“保留塊”，而它在 CPU 中不存在或只是臨時安裝過，那么這些區域的部分內容會被重寫。在電源接通/斷開之后，其他內容會在相關區里找到。

二六、為何不能把閃存卡的內容加載入 S7300CPU

你的項目在閃存卡上。現在要用它加載 S7300。但加載結束后發現 CPU 的 RAM 中仍是空的。出現此問題的原因是你的程序里有無法處理的，"錯誤的"組織塊（比

如說，OB86 沒有 DP 接口）。在重新設置和重新啟動 CPU 后,RAM 仍是空的。診斷緩沖區對這個"無法加載"的塊會提示一些信息。

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