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NI PXI-4072以高達(dá)1毫秒/秒的速率提供模擬輸出
停止模式到運(yùn)行模式的轉(zhuǎn)換
CPU從停止模式到運(yùn)行模式的轉(zhuǎn)換過程中執(zhí)行以下操作:
■確認(rèn)掃描模式和程序 編制模式選擇
■確認(rèn)程序使用的變量和實(shí)際配置的變量范圍
■重新初始化外部程序塊和獨(dú)立C程序所使用的數(shù)據(jù)空間
■清空非保持型的存儲(chǔ)區(qū)域
閃存操作
CPU在以電池為后備電源的RAM中存儲(chǔ)應(yīng)用程序和硬件配置。對(duì)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(chǔ)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(jì)入用戶空間。關(guān)于哪些內(nèi)容計(jì)入用戶空間，請(qǐng)參考附錄B。CPU上電時(shí),會(huì)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(shí)從閃存讀取數(shù)據(jù)(上電時(shí))。建議使用此方式，因?yàn)殚W存是穩(wěn)定的而且不需要電池作為后備電源來保持?jǐn)?shù)據(jù)。
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