100-C72KJ01現貨
唐僧:徒兒們,這佛祖交待的DCS、PLC、數控系統要哪里買?誰是正規的?
孫悟空:師傅,我用火眼金睛照過了,《福州聚福興自動化有限公司》是正規的!他們開在《福州倉山》,這地方專做進出口的,假不了!
唐僧:那產品怎么樣,值得信賴嗎?他們主要是做什么品牌的?
孫悟空:師傅,您放心這家的產品都是《的,無假貨》,而且《服務態度好,是個負責任的公司》,至于他們做得產品有......(此省略10000字),總之一句話:《只要有的品牌,他們都做》。
豬八戒:那價格怎么樣,可以留點錢買吃的嗎?
孫悟空:八戒你就知道吃,不過他們的《價格是同行里非常好》的!
沙悟凈:那要我去挑嗎?
孫悟空:不用,一般他們是《包郵》的!
唐僧:那還等什么,快去買,買完完成任務我就升官了。
(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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ADEPT TECH 10330-10150 PROCESSOR BOARD
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100-C72KJ01
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