BENTLY NEVADA 10513-02建立數(shù)據(jù)庫:數(shù)據(jù)庫是SCADA系統(tǒng)賴以工作的基礎(chǔ),它由一系列數(shù)據(jù)點(diǎn)構(gòu)成,每個(gè)數(shù)據(jù)點(diǎn)實(shí)際上就是一個(gè)功能塊, FIX提供了各種功能塊以滿足不同的需要,這些功能塊或?qū)涌谠O(shè)備讀寫數(shù)據(jù),或?qū)?shù)據(jù)進(jìn)行運(yùn)算和報(bào)警處理。在數(shù)據(jù)庫中建立一個(gè)數(shù)據(jù)點(diǎn)就是定義一個(gè)功能塊,其內(nèi)容包括:功能塊類型,數(shù)據(jù)點(diǎn)的位號(hào)、注釋、零點(diǎn)、量程,接口設(shè)備,I/O地址,數(shù)據(jù)的格式,報(bào)警上、下限等。如:在數(shù)據(jù)庫中添加一個(gè)AI模塊,在其屬性對(duì)話框中定BENTLY NEVADA 72001-01BENTLY NEVADA 10513-02緩沖球罐F0101A液位”,“接口設(shè)備”為“OMR”,“I/O地址”為“D:DM: 232”,“數(shù)據(jù)的格式”為“12AL”,“零點(diǎn)”為“0”,“量程”為“17”,“單位”為“M”;則在數(shù)據(jù)庫中便建立了一個(gè)數(shù)據(jù)點(diǎn)LT-101,它讀取PLC中地址為DM0232的寄存器中的數(shù)據(jù)(0 -4095),并轉(zhuǎn)換為0-17M的數(shù)據(jù)供FIX其它功能塊和流程圖調(diào)用。
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