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IC200UEC108 GE模塊

	價格：5464 元(人民幣)	產(chǎn)地：本地
	最少起訂量：1個	發(fā)貨地：福建廈門市
	上架時間：2022-09-26 09:10:37	瀏覽量：287
	廈門億佳天辰貿(mào)易有限公司
	經(jīng)營模式：	公司類型：私營合伙企業(yè)
	所屬行業(yè)：電工電器成套設(shè)備	主要客戶：
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詳細(xì)介紹

西門子的S7-200的程序結(jié)構(gòu)

過程映像輸入/輸出（I/Q）、變量存儲器V、內(nèi)部存儲器位M、定時器T、計數(shù)器C等屬于全局變量。S7-200的程序組織單元(ProgramOrganizationalUnit，簡稱為POU)包括主程序、子程序和中斷程序。每個POU均有自己的64字節(jié)局部變量，局部變量只能在它所在的POU中使用。與此相反，全局變量可以在各POU中使用。

下面是子程序可以使用的局部變量：

1)TEMP(臨時變量)是暫時保存在局部數(shù)據(jù)區(qū)中的變量。只有在執(zhí)行該POU時，定義的臨時變量才被使用，POU執(zhí)行完后，不再保存臨時變量的數(shù)值。

2)IN是由調(diào)用它的POU提供的輸入?yún)?shù)。

3)OUT是返回給調(diào)用它的POU的輸出參數(shù)(子程序的執(zhí)行結(jié)果)。

4)IN_OUT是輸入_輸出參數(shù)，其初始值由調(diào)用它的POU傳送給子程序，并用同一變量將子程序的執(zhí)行結(jié)果返回給調(diào)用它的POU。

主程序和中斷程序的局部變量中只有臨時變量TEMP。

具有輸入、輸出參數(shù)和局部變量的子程序易于實現(xiàn)結(jié)構(gòu)化編程，對于長期生產(chǎn)同類設(shè)備或生產(chǎn)線的廠家尤為有用。這些廠家的編程人員為設(shè)備的各組件或工藝功能編寫了大量的通用的子程序。即使不知道子程序的內(nèi)部代碼，只要知道子程序的功能和輸入、輸出參數(shù)的意義，就可以通過程序之間的調(diào)用快速“組裝”出滿足不同用戶要求的控制程序。就好像用數(shù)字集成電路芯片組成復(fù)雜的數(shù)字電路一樣。

子程序如果沒有輸入、輸出參數(shù)，它和調(diào)用它的程序之間沒有清晰的接口，很難實現(xiàn)結(jié)構(gòu)化編程。

子程序如果沒有局部變量，它和調(diào)用它的程序之間只能通過全局變量來交換數(shù)據(jù)，子程序內(nèi)部也只能使用全局變量。將子程序和中斷程序移植到別的項目時，需要重新統(tǒng)一安排它們使用的全局變量，以保證不會出現(xiàn)地址沖突。當(dāng)程序很復(fù)雜，子程序和中斷程序很多時，這種重新分配地址的工作量非常大。

如果子程序和中斷程序有局部變量，并且它們內(nèi)部只使用局部變量，不使用全局變量，因為與其他POU沒有地址沖突，不需作任何改動，就可以將子程序移植到別的項目中去。

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