BOSCH 047961-102401現(xiàn)貨

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態(tài)變量和臨時(shí)變量(暫態(tài)變量)兩種。參數(shù)是在調(diào)用塊和被調(diào)用塊間傳遞的數(shù)據(jù)。靜態(tài)變量和臨時(shí)變量是僅供邏輯塊本身使用的數(shù)據(jù)。表5.1給出了局部數(shù)據(jù)聲明類型，表中內(nèi)容的排列順序也是在變量聲明
表中聲明變量的順序和變量在內(nèi)存中的存儲(chǔ)順序。在邏輯塊中不需使用的局部數(shù)據(jù)類型，可以不必在變量聲明表中聲明。
表5.1 局部數(shù)據(jù)類型
變 量 名 類 型 說 明
輸入?yún)?shù) In 由調(diào)用邏輯塊的塊提供數(shù)據(jù)，輸入給邏輯塊的指令
輸出參數(shù) Out 向調(diào)用邏輯塊的塊返回參數(shù)，即從邏輯塊輸出結(jié)果數(shù)據(jù)
IO參數(shù) In_Out 參數(shù)的值由調(diào)用塊的塊提供，由邏輯塊處理修改，然后返回
靜態(tài)變量 Stat 靜態(tài)變量存儲(chǔ)在背景數(shù)據(jù)塊中，塊調(diào)用結(jié)束后，其內(nèi)容被保留
臨時(shí)變量 Temp 臨時(shí)變量存儲(chǔ)在L堆棧中，塊執(zhí)行結(jié)束變量的值因被其它內(nèi)容覆蓋而丟掉
對于功能塊FB，操作系統(tǒng)為參數(shù)及靜態(tài)變量分配的存儲(chǔ)空間是背景數(shù)據(jù)塊。這樣參數(shù)變量在背景數(shù)據(jù)塊中留有運(yùn)行結(jié)果備份。在調(diào)用FB時(shí)，若沒有提供實(shí)參，則功能塊使用背景數(shù)據(jù)塊中的數(shù)值。操作系統(tǒng)在L堆棧中給FB的臨時(shí)變量分配存儲(chǔ)空間。
對于功能塊FC，操作系統(tǒng)在L堆棧中給FC的臨時(shí)變量分配存儲(chǔ)空間。由于沒有背景數(shù)據(jù)塊，因而FC不能使用靜態(tài)變量。輸入、輸出、IO參數(shù)以指向?qū)崊⒌闹羔樞问酱鎯?chǔ)在操作系統(tǒng)為參數(shù)傳遞而保留的額外空間中。
對于組織塊OB來說，其調(diào)用是由操作系統(tǒng)管理的，用戶不能參與。因此，OB只有定義在L堆棧中的臨時(shí)變量。
1) 形參
為保證功能塊對同一類設(shè)備控制的通用性，用戶在編程時(shí)就不能使用具體設(shè)備對應(yīng)的存儲(chǔ)區(qū)地址參數(shù)(如不能使用I1.0等)，而是使用這類設(shè)備的抽象地址參數(shù)。這些抽象參數(shù)稱為形式參數(shù)，簡稱形參。將該設(shè)備的相應(yīng)實(shí)際存儲(chǔ)區(qū)地址參數(shù)(簡稱實(shí)參)傳遞給功能塊，功能塊在運(yùn)行時(shí)以實(shí)參替代形參，從而可通過調(diào)用功能塊實(shí)現(xiàn)對具體設(shè)備的控制。當(dāng)對另一設(shè)備控制時(shí)，同樣也可通過調(diào)用實(shí)參將其傳遞給功能塊。
形參需在功能塊的變量聲明表中定義，實(shí)參在調(diào)用功能塊時(shí)給出。在功能塊的不同調(diào)用處，可為形參提供不同的實(shí)參，但實(shí)參的數(shù)據(jù)類型必須與形參一致。用戶程序可定義功能塊的輸入值參數(shù)或輸出值參數(shù)，也可定義一參數(shù)作為輸入輸出值。參數(shù)傳遞可將調(diào)用塊的信息傳遞給被調(diào)用塊，也能把被調(diào)用塊的運(yùn)行結(jié)果返回給調(diào)用塊。
2) 靜態(tài)變量
靜態(tài)變量在PLC運(yùn)行期間始終被存儲(chǔ)。S7將靜態(tài)變量定義在背景數(shù)據(jù)塊中，當(dāng)被調(diào)用塊運(yùn)行時(shí)，能讀出或修改靜態(tài)變量；被調(diào)用塊運(yùn)行結(jié)束后，靜態(tài)變量保留在數(shù)據(jù)塊中。由于只有功能塊FB有關(guān)聯(lián)的背景數(shù)據(jù)塊，因此只能為FB定義靜態(tài)變量。功能塊FC不能有靜態(tài)變量。

Accuray 9-083161-001 Circuit Board #26434
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BOSCH 047961-102401

GENUINE APC Symmetra Replacement Battery SYBTU1-PLP C10 NEW for SYBT4
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BOSCH 047961-102401

Alfa Laval Tri Clover TSK5 Lip Seal Housing #2
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BOSCH 047961-102401

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