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) 臨時變量
臨時變量僅在邏輯塊運(yùn)行時有效，邏輯塊結(jié)束時存儲臨時變量的內(nèi)存被操作系統(tǒng)另行 分配。S7將臨時變量定義在L堆棧中，L堆棧是為存儲邏輯塊的臨時變量而專設(shè)的。當(dāng)塊程序運(yùn)行時，在L堆棧中建立該塊的臨時變量，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)類型包括定時器、計數(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
定時器(Timer) 2 B 在功能塊中定義一個定時器形參，調(diào)用時賦予定時器實(shí)參
計數(shù)器(Counter) 2 B 在功能塊中定義一個計數(shù)器形參，調(diào)用時賦予計數(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功能塊或數(shù)據(jù)塊形參變量，調(diào)用時給功能塊類或數(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形參，該形參說明的是內(nèi)存的地址指針。例如，調(diào)用時可給形參賦予實(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，可以使用該類型
1) 定時器或計數(shù)器參數(shù)類型
在功能塊中定義一個定時器或計數(shù)器類型的形參，功能塊就能使用一個定時器或計數(shù)器，而不需明確具體的定時器或計數(shù)器，等到調(diào)用該功能塊時再確定定時器或計數(shù)器號。這使用戶程序能靈活性地分配和使用定時器或計數(shù)器。當(dāng)給定時器或計數(shù)器參數(shù)類型形參分配實(shí)參時，在“T”或“C”后跟一個有效整數(shù)，如T 100。
2) 塊參數(shù)類型
當(dāng)定義一個作為輸入輸出的塊時，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，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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