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先將控制器由STOP位置旋MRES,STOP燈慢閃后將再回到STOP位置，再旋至MRES,STOP燈快閃后，回到RUN位置。 然后下裝硬件組態，下裝過程中程序會將控制器置于STOP狀態，正確下裝結束后會提示重新激活到RUN狀態。
3.程序的編寫:已經建立的項目至少包括一個組織塊（OB1）所有的程序都要在OB1中運行，還要建立數據塊（DB），用于定義程要用到的中間變量。為了減少OB1中的掃描時間，好是建立一些功能塊（FC）,用于編寫具有獨立功能的子程序，當然每個FC功能塊都必須在OB中運行才有效，否則不會被執行。在編寫程序的過程中我們除了I/O點之外，要調用DB塊中定義的。
3.1DB塊的建立
是在硬件組態后的畫面空白處，右鍵選中插入DB塊，為了在FC塊中能夠正確調用，要給DB塊定義符號名稱，比如在這里定義為LC3201。
以一個液位測量回路為例，我們看一下要怎么在DB 塊中定義變量。變送器輸出的4－20MA的量要經過輸入通道映像到程序中，這就是我們接收到的數據，假如是個AI通道，那么它的硬件地址就是PIW288,十進制數值范圍0－27648，是一個WORD型16位的變量，在這里我們終要將其變成一個實型變量（REAL）,轉換的過程依次是先把WORD轉化成INT（16位的整型變量），然后再轉換DINT（32位的雙整型變量），再轉換為32位的REAL(實型變
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IB IL AO 2/SF
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