函數(shù)塊是用戶定義的具有參數(shù)和臨時(shí)數(shù)據(jù)的邏輯塊。用戶可以定義自己的函數(shù)塊，而不必局限于PAC系統(tǒng)指令設(shè)定的標(biāo)準(zhǔn)函數(shù)塊。很多情況下，這個(gè)特性的使用可以使整個(gè)程序的變小。–旦定義了函數(shù)塊，可以生成很多個(gè)程序塊實(shí)例。每個(gè)實(shí)例有自己唯–的函數(shù)塊實(shí)例數(shù)據(jù)，這個(gè)事例中包含除含參變量外的所有輸入輸出參數(shù)。函數(shù)塊在某個(gè)實(shí)例上被調(diào)用時(shí)

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