103S-ASD2-CB10C-KY現貨

本公司專業銷售大型進口各種品牌DCS系統模塊備件：主營產品：DCS集散式控制系統、PLC可編程控制。
主要業務: ABB DCS卡件Ovation系統模塊Foxboro系統卡件Triconex系統模塊
Rexroth力士樂全系列產品Modicon停產模塊 等各類工控產品施耐德140系列CPU,PLC
西門子6DD，6FX，6SC，6FC，6S5系列AB1746，1756，1747，1785系列PLC
GE 通用電氣 發那科

(1) 功能塊FC實參的指針存到調用塊的L堆棧；
(2) 調用塊的地址和返回位置存儲在塊堆棧，調用塊的局部數據壓入L堆棧；
(3) 功能塊存儲臨時變量的L堆棧區被推入L堆棧上部；
(4) 當被調用功能塊FC結束時，先前塊的信息存儲在塊堆棧中，臨時變量彈出L堆棧。
因為功能塊FC不用背景數據塊，不能分配初始數值給功能塊FC的局部數據，所以必須給功能塊FC提供實參。
STEP 7為功能塊FC提供了一個特殊的返回值輸出參數(關鍵字：RET_VAL)。當在文本文件中創建功能塊FC時，你可以在定義功能塊FC命令后輸入數據類型(如BOOL或INT)。對文本文件進行編譯時，STEP 7會自動生成RET_VAL輸出參數。當用STEP 7的程序編輯器(Program Editor)以增量模式創建功能塊FC時，可在FC的變量聲明表中聲明一個輸出參數RET_VAL，并指明其數據類型。
功能塊編程與調用舉例
對功能塊編程分兩步進行：步是定義局部變量(填寫局部變量表)；第二步是編寫要執行的程序，可以用梯形圖或語句表兩種形式編程，并在編程過程中使用定義了的局部變量(數據)。
定義局部變量的工作內容包括：
(1) 分別定義形參、靜態變量和臨時變量(FC塊中不包括靜態變量)；
(2) 確定各變量的聲明類型(Decl.)、變量名(Name)和數據類型(Data Type)，還要為變量設置初始值(Initial Value)(盡管對有些變量初始值不一定有意義)。如果需要還可為變量注釋(Comment)。在增量編程模式下，STEP 7將自動產生局部變量地址(Address)。
寫功能塊程序時，可以用以下兩種方式使用局部變量：
(1) 使用變量名，此時變量名前加前綴“#”，以區別于在符號表中定義的符號地址。增量方式下，前綴會自動產生。
(2) 直接使用局部變量的地址，這種方式只對背景數據塊和L堆棧有效。
在調用FB塊時，要說明其背景數據塊。背景數據塊應在調用前生成，其順序格式與變量聲明表必須保持一致。在增量方式下，調用FB塊時，STEP 7會自動提醒并生成背景數據塊。此時也為背景數據塊設置了初始值，該初始值與變量聲明表中的相同。當然也可以為背景數據塊設置當前值(Current Value)，即存儲在CPU中的數值。
1．二分頻器
假設功能塊FC10是二分頻器產生程序，功能是對不同的輸入位進行二分頻處理。以下給出了FC10的變量聲明表和語句表程序。在程序中使用了跳變沿檢測指令。
1) FC10的變量聲明表(見表5.3)

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1.5 Inch Tri Clamp Diaphram Valve Alfa Laval Crane Saunders Stainless Steel 316L
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103S-ASD2-CB10C-KY

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