D62/OFEW110N9DK25L/62現貨
臨時變量僅在邏輯塊運行時有效，邏輯塊結束時存儲臨時變量的內存被操作系統另行 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的。當塊程序運行時，在L堆棧中建立該塊的臨時變量，一旦塊執行結束，堆棧重新分配，因而信息丟失。
邏輯塊局部數據的數據類型
在變量聲明表中，要明確局部數據的數據類型，這樣操作系統才能給變量分配確定的 存儲空間。局部數據可以是基本數據類型或復式數據類型，也可以是專門用于參數傳遞 的所謂的“參數類型”。參數類型包括定時器、計數器、塊的地址或指針等，見表5.2。表5.2 參數類型變量
參數類型 大 小 說 明
定時器(Timer) 2 B 在功能塊中定義一個定時器形參，調用時賦予定時器實參
計數器(Counter) 2 B 在功能塊中定義一個計數器形參，調用時賦予計數器實參
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據塊形參變量，調用時給功能塊類或數據塊類形參賦予實際的功能塊或數據塊編號，如
FC 101、DB 42
指針(Pointer) 6 B 在功能塊中定義一個形參，該形參說明的是內存的地址指針。例如，調用時可給形參賦予實參P#M50.0，以訪問內存M50.0
ANY 10 B 當實參的數據類型未知時，可以使用該類型
1) 定時器或計數器參數類型
在功能塊中定義一個定時器或計數器類型的形參，功能塊就能使用一個定時器或計數器，而不需明確具體的定時器或計數器，等到調用該功能塊時再確定定時器或計數器號。這使用戶程序能靈活性地分配和使用定時器或計數器。當給定時器或計數器參數類型形參分配實參時，在“T”或“C”后跟一個有效整數，如T 100。
2) 塊參數類型
當定義一個作為輸入輸出的塊時，參數聲明決定了塊的類型(FB、FC、DB等)。當為塊參數類型形參分配實參時，可以使用物理地址，如FC 101，也可使用符號地址，如“valve
3) 指針參數類型

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