XYCOM FN-X32TS41現(xiàn)貨
 
	
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———————小楊期待您的咨詢
	
	
 
) 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參P#M50.0,以訪問內(nèi)存M50.0
ANY    10 B    當(dāng)實參的數(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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