SHX68R52UC現(xiàn)貨
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主營產(chǎn)品:DCS集散式控制系統(tǒng)、PLC可編程控制器、數(shù)控系統(tǒng)、測量傳感器、高壓開關(guān)柜、控制柜、變頻柜。
DCS集散式控制系統(tǒng)主要經(jīng)營品牌:FOXBORO、TRICONEX、Westinghouse OVATION、XYCOM、Sienmens Moore、Rockwell Reliance、MOTOROLA等等。
PLC可編程控制器主要經(jīng)營品牌:Allen-Bradley、Schneider Modicon、Sienmens等等。
數(shù)控系統(tǒng)主要經(jīng)營品牌:FANUC、OKUMA、YASKAWA、Sienmens、Mitsubishi等等。
主營產(chǎn)品:Fanuc,Foxboro,Ovatin,Allen-Bradley,Siemens等各類工控產(chǎn)品,歡迎來電咨詢
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,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,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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