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若初始值中有順序相同的元素，寫法可以簡化，如要數(shù)組的頭兩個元素設(shè)特定數(shù)值，其余4個為10，則可簡寫為17，23，4(10)，其中4為重復(fù)系數(shù)，10為要重復(fù)的數(shù)值。
3) 訪問數(shù)組
利用數(shù)組中指定元素的下標(biāo)可以訪問數(shù)組數(shù)據(jù)，這時(shí)數(shù)據(jù)塊、數(shù)組符號名及下標(biāo)一起 使用。如圖5.5中聲明的數(shù)組在DB20(符號名：MOTOR)的個字節(jié)處開始，用以下地址訪問數(shù)組中的第二個元素：
MOTOR. Heat_2×3[1，2]
4) 利用數(shù)組傳遞參數(shù)
將數(shù)組作為參數(shù)傳遞時(shí)，要求形式參數(shù)和實(shí)際參數(shù)必須有同樣的數(shù)據(jù)組織結(jié)構(gòu)、相同 的數(shù)據(jù)類型，并按相同的順序排列。
2. 構(gòu)造
構(gòu)造將不同數(shù)據(jù)類型組合成一個整體，見圖5.6。構(gòu)造的元素可以是任何基本數(shù)據(jù)類型或復(fù)式數(shù)據(jù)類型，有數(shù)組或構(gòu)造元素的構(gòu)造能嵌套8層。因此，STEP 7允許用戶將過程中的各種關(guān)聯(lián)數(shù)據(jù)統(tǒng)一組織在一個構(gòu)造中，也為統(tǒng)一處理不同類型數(shù)據(jù)或參數(shù)提供了可能性
1) 建立構(gòu)造
構(gòu)造(STRUCT)只能在數(shù)據(jù)塊或變量聲明表中定義。圖5.7所示為由整數(shù)(存放數(shù)量)、字節(jié)(存放原始數(shù)據(jù))、字符(存放控制碼)、浮點(diǎn)數(shù)(存放溫度)、布爾數(shù)(完成標(biāo)志信號)組成的構(gòu)造。該構(gòu)造的名稱為Stack_1。
2) 賦初始值
按每個元素的類型和名稱給構(gòu)造的每個元素賦初始值。并將其寫入圖5.8中Initial Value(初始值欄)的相應(yīng)行中。例如，可以分配如下初始值：
Amount＝0
Original_data＝B#l6#0
Control_code＝“Z”
Temperature＝98.6
End：＝FALSE
3) 訪問構(gòu)造
(1) 用符號地址訪問：如MOTO.Stack_1.Temperature，其中，MOTO為構(gòu)造所在數(shù)據(jù)塊DB20的符號名。
(2) 用物理地址訪問：如Stack_l從DB20的字節(jié)0開始存放，Amount的物理地址是DB20.DBW0，Temperature的地址為DB20.DBD4。
4) 利用構(gòu)造傳遞參數(shù)
構(gòu)造可以作為參數(shù)來傳遞。將構(gòu)造作為參數(shù)傳遞時(shí)，要求形式參數(shù)和實(shí)際參數(shù)必須有同樣的數(shù)據(jù)組織結(jié)構(gòu)、相同的數(shù)據(jù)類型，并按相同的順序

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PK296A2A-SG36

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PK296A2A-SG36

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PK296A2A-SG36