100-C72KJ01現(xiàn)貨
唐僧:徒兒們,這佛祖交待的DCS、PLC、數(shù)控系統(tǒng)要哪里買?誰(shuí)是正規(guī)的?
孫悟空:師傅,我用火眼金睛照過(guò)了,《福州聚福興自動(dòng)化有限公司》是正規(guī)的!他們開在《福州倉(cāng)山》,這地方專做進(jìn)出口的,假不了!
唐僧:那產(chǎn)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(chǎn)品都是《的,無(wú)假貨》,而且《服務(wù)態(tài)度好,是個(gè)負(fù)責(zé)任的公司》,至于他們做得產(chǎn)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(jià)格怎么樣,可以留點(diǎn)錢買吃的嗎?
孫悟空:八戒你就知道吃,不過(guò)他們的《價(jià)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(wù)我就升官了。
(1) 功能塊FC實(shí)參的指針存到調(diào)用塊的L堆棧;
(2) 調(diào)用塊的地址和返回位置存儲(chǔ)在塊堆棧,調(diào)用塊的局部數(shù)據(jù)壓入L堆棧;
(3) 功能塊存儲(chǔ)臨時(shí)變量的L堆棧區(qū)被推入L堆棧上部;
(4) 當(dāng)被調(diào)用功能塊FC結(jié)束時(shí),先前塊的信息存儲(chǔ)在塊堆棧中,臨時(shí)變量彈出L堆棧。
因?yàn)楣δ軌KFC不用背景數(shù)據(jù)塊,不能分配初始數(shù)值給功能塊FC的局部數(shù)據(jù),所以必須給功能塊FC提供實(shí)參。
STEP 7為功能塊FC提供了一個(gè)特殊的返回值輸出參數(shù)(關(guān)鍵字:RET_VAL)。當(dāng)在文本文件中創(chuàng)建功能塊FC時(shí),你可以在定義功能塊FC命令后輸入數(shù)據(jù)類型(如BOOL或INT)。對(duì)文本文件進(jìn)行編譯時(shí),STEP 7會(huì)自動(dòng)生成RET_VAL輸出參數(shù)。當(dāng)用STEP 7的程序編輯器(Program Editor)以增量模式創(chuàng)建功能塊FC時(shí),可在FC的變量聲明表中聲明一個(gè)輸出參數(shù)RET_VAL,并指明其數(shù)據(jù)類型。
功能塊編程與調(diào)用舉例
對(duì)功能塊編程分兩步進(jìn)行:步是定義局部變量(填寫局部變量表);第二步是編寫要執(zhí)行的程序,可以用梯形圖或語(yǔ)句表兩種形式編程,并在編程過(guò)程中使用定義了的局部變量(數(shù)據(jù))。
定義局部變量的工作內(nèi)容包括:
(1) 分別定義形參、靜態(tài)變量和臨時(shí)變量(FC塊中不包括靜態(tài)變量);
(2) 確定各變量的聲明類型(Decl.)、變量名(Name)和數(shù)據(jù)類型(Data Type),還要為變量設(shè)置初始值(Initial Value)(盡管對(duì)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(dòng)產(chǎn)生局部變量地址(Address)。
寫功能塊程序時(shí),可以用以下兩種方式使用局部變量:
(1) 使用變量名,此時(shí)變量名前加前綴“#”,以區(qū)別于在符號(hào)表中定義的符號(hào)地址。增量方式下,前綴會(huì)自動(dòng)產(chǎn)生。
(2) 直接使用局部變量的地址,這種方式只對(duì)背景數(shù)據(jù)塊和L堆棧有效。
在調(diào)用FB塊時(shí),要說(shuō)明其背景數(shù)據(jù)塊。背景數(shù)據(jù)塊應(yīng)在調(diào)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(diào)用FB塊時(shí),STEP 7會(huì)自動(dòng)提醒并生成背景數(shù)據(jù)塊。此時(shí)也為背景數(shù)據(jù)塊設(shè)置了初始值,該初始值與變量聲明表中的相同。當(dāng)然也可以為背景數(shù)據(jù)塊設(shè)置當(dāng)前值(Current Value),即存儲(chǔ)在CPU中的數(shù)值。
1.二分頻器
假設(shè)功能塊FC10是二分頻器產(chǎn)生程序,功能是對(duì)不同的輸入位進(jìn)行二分頻處理。以下給出了FC10的變量聲明表和語(yǔ)句表程序。在程序中使用了跳變沿檢測(cè)指令。
1) FC10的變量聲明表(見表5.3)
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100-C72KJ01
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100-C72KJ01
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