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PAC系統(tǒng)應(yīng)用程序的結(jié)構(gòu)
PAC系統(tǒng)應(yīng)用程序是程序塊結(jié)構(gòu)的。應(yīng)用程序中包括系統(tǒng)內(nèi)的CPU和模塊所需的所有控制邏輯。
應(yīng)用程序在編程軟件中開發(fā)并且傳輸?shù)紺PU中。程序存儲(chǔ)在CPU的穩(wěn)定內(nèi)存中。在CPU掃描過程中(第5章)，CPU從模塊讀取輸入數(shù)據(jù)，并且存儲(chǔ)在輸入存儲(chǔ)器中。然后CPU使用更新了的輸入數(shù)據(jù)完全執(zhí)行一-次應(yīng)用程序。應(yīng)用程序執(zhí)行后產(chǎn)生新的輸出數(shù)據(jù)并將這些數(shù)據(jù)寫入輸出存儲(chǔ)器。
應(yīng)用程序執(zhí)行完后，CPU將輸出模塊寫到模塊中。模塊結(jié)構(gòu)的程序包含一個(gè)_MAIN 塊。程序從MAIN 塊開始執(zhí)行，包括MAIN 塊在內(nèi)，程序多可以有512個(gè)塊。
如何調(diào)用程序塊
在程序邏輯中_ MAIN 塊和其他塊中調(diào)用后，程序塊執(zhí)行。在本例中，LD_ BLK1 一直被調(diào)用?？梢栽O(shè)定程序塊的調(diào)用條件，在輸入量%100500和輸出量%Q00100為ON時(shí)，調(diào)用LD_ BLK2。 詳見第八章的調(diào)用函數(shù)。
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