1746-F2現(xiàn)貨

福州聚福興自動(dòng)化有限公司銷售的進(jìn)口備件從國外生產(chǎn)廠家直接進(jìn)貨，

實(shí)行扁平化的銷售模式，給客戶節(jié)約了時(shí)間和成本。

我們的目標(biāo)就是國內(nèi)用戶采購國外備件遇到困難和疑難時(shí)都能找到我們。

我們能夠及時(shí)地報(bào)出優(yōu)惠的價(jià)格和迅捷的交貨期；國內(nèi)用戶采購國外備件受到代理壟斷價(jià)格時(shí)，

我們會給用戶提供一個(gè)比較的機(jī)會，并且為客戶提供=的解決方案。由于我們的訂單集中，訂貨量大，

因此我們能提供頗具競爭力的價(jià)格并能夠迅速交貨，我們長期以來致力于解決國內(nèi)用戶采購國外備件中的疑難問題，

并為廣大用戶提供電氣及工控自動(dòng)化成套設(shè)備的購銷、現(xiàn)場調(diào)試等全面周到的服務(wù)。

) 臨時(shí)變量
臨時(shí)變量僅在邏輯塊運(yùn)行時(shí)有效，邏輯塊結(jié)束時(shí)存儲臨時(shí)變量的內(nèi)存被操作系統(tǒng)另行 分配。S7將臨時(shí)變量定義在L堆棧中，L堆棧是為存儲邏輯塊的臨時(shí)變量而專設(shè)的。當(dāng)塊程序運(yùn)行時(shí)，在L堆棧中建立該塊的臨時(shí)變量，一旦塊執(zhí)行結(jié)束，堆棧重新分配，因而信息丟失。
邏輯塊局部數(shù)據(jù)的數(shù)據(jù)類型
在變量聲明表中，要明確局部數(shù)據(jù)的數(shù)據(jù)類型，這樣操作系統(tǒng)才能給變量分配確定的 存儲空間。局部數(shù)據(jù)可以是基本數(shù)據(jù)類型或復(fù)式數(shù)據(jù)類型，也可以是專門用于參數(shù)傳遞 的所謂的“參數(shù)類型”。參數(shù)類型包括定時(shí)器、計(jì)數(shù)器、塊的地址或指針等，見表5.2。表5.2 參數(shù)類型變量
參數(shù)類型 大 小 說 明
定時(shí)器(Timer) 2 B 在功能塊中定義一個(gè)定時(shí)器形參，調(diào)用時(shí)賦予定時(shí)器實(shí)參
計(jì)數(shù)器(Counter) 2 B 在功能塊中定義一個(gè)計(jì)數(shù)器形參，調(diào)用時(shí)賦予計(jì)數(shù)器實(shí)參
塊：
Block_FB
Block_FC
Block_DB
Block_SDB 2 B 在功能塊中定義一個(gè)功能塊或數(shù)據(jù)塊形參變量，調(diào)用時(shí)給功能塊類或數(shù)據(jù)塊類形參賦予實(shí)際的功能塊或數(shù)據(jù)塊編號，如
FC 101、DB 42
指針(Pointer) 6 B 在功能塊中定義一個(gè)形參，該形參說明的是內(nèi)存的地址指針。例如，調(diào)用時(shí)可給形參賦予實(shí)參P#M50.0，以訪問內(nèi)存M50.0
ANY 10 B 當(dāng)實(shí)參的數(shù)據(jù)類型未知時(shí)，可以使用該類型
1) 定時(shí)器或計(jì)數(shù)器參數(shù)類型
在功能塊中定義一個(gè)定時(shí)器或計(jì)數(shù)器類型的形參，功能塊就能使用一個(gè)定時(shí)器或計(jì)數(shù)器，而不需明確具體的定時(shí)器或計(jì)數(shù)器，等到調(diào)用該功能塊時(shí)再確定定時(shí)器或計(jì)數(shù)器號。這使用戶程序能靈活性地分配和使用定時(shí)器或計(jì)數(shù)器。當(dāng)給定時(shí)器或計(jì)數(shù)器參數(shù)類型形參分配實(shí)參時(shí)，在“T”或“C”后跟一個(gè)有效整數(shù)，如T 100。
2) 塊參數(shù)類型
當(dāng)定義一個(gè)作為輸入輸出的塊時(shí)，參數(shù)聲明決定了塊的類型(FB、FC、DB等)。當(dāng)為塊參數(shù)類型形參分配實(shí)參時(shí)，可以使用物理地址，如FC 101，也可使用符號地址，如“valve
3) 指針參數(shù)類型

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1746-F2

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1746-F2

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1746-F2

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