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NI PXI-4072以高達1毫秒/秒的速率提供模擬輸出
停止模式到運行模式的轉(zhuǎn)換
CPU從停止模式到運行模式的轉(zhuǎn)換過程中執(zhí)行以下操作:
■確認掃描模式和程序 編制模式選擇
■確認程序使用的變量和實際配置的變量范圍
■重新初始化外部程序塊和獨立C程序所使用的數(shù)據(jù)空間
■清空非保持型的存儲區(qū)域
閃存操作
CPU在以電池為后備電源的RAM中存儲應(yīng)用程序和硬件配置。對于PAC系統(tǒng)來說，你也可以選擇將邏輯，硬件配置，變量數(shù)據(jù)存入閃存本地閃存。PAC系統(tǒng)CPU提供了足夠的閃存空間來存儲所有的用戶可空間(10MB)里的數(shù)據(jù)，并且能夠滿足更高的要求。變量表不計入用戶空間。關(guān)于哪些內(nèi)容計入用戶空間，請參考附錄B。CPU上電時,會讀取邏輯和配置，變量表數(shù)據(jù)。缺省情況是從RAM讀取。然而邏輯/配置，變量表每--類數(shù)據(jù)都可以配置為總從閃存讀取或有條件從閃存讀取。要在編程軟件中配置這些參數(shù)，選擇CPU硬件配置中的設(shè)定鍵。如果選擇有條件的將閃存作為的數(shù)據(jù)來源，只在檢測到內(nèi)存崩潰或者沒有電池時從閃存讀取數(shù)據(jù)(上電時)。建議使用此方式，因為閃存是穩(wěn)定的而且不需要電池作為后備電源來保持數(shù)據(jù)。
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