ACS550-01-06A9-4/ACS510-01-07A2-4現貨
2011年12月23日,北京――安捷倫科技于12月21日在北京新云南皇冠假日酒店成功舉辦安捷倫測量測試-,本次會議以追隨科技發展的腳步為主題,全天的主題報告包括上午的科技介紹、下午的無線通信論壇和射頻微波論壇兩個分論壇。來自無線通信、微波與射頻、航空航天與國防科技等熱門電子測試測量領域的工程師、研發人員、項目經理、芯片組設計師、認證研究人員等行業內人士,共計400多人參加了本次-。
單子,得之,我幸。不得,我力爭到底,如此而已。
好價格就在這里,不容遲疑。
我司產品應用于以下領域:
★《dcs集散控制系統》
☆《發電廠dcs監控系統》
☆《plc可編程輸送控制系統》
★《智能平鋼化爐系統制造》
☆《電氣控制系統》造紙,印染生產線,變電站綜合自動化控制系統
☆《智能型消防供水控制系統》
★《化工廠藥液恒流量計算機控制系統》
主營:dcs集散式控制系統,plc可編程控制器,數控系統,(cpu處理器,模塊,卡件,控制器,伺服驅動,驅動器,馬達電機, 內存卡, 電源,機器人備件等)各類工控備品備件產品。
【品質保證】【質量可靠】【確保】【確保低價】
【現貨多多】【驚喜多多】【立馬下手】【人人都有】
若初始值中有順序相同的元素,寫法可以簡化,如要數組的頭兩個元素設特定數值,其余4個為10,則可簡寫為17,23,4(10),其中4為重復系數,10為要重復的數值。
3) 訪問數組
利用數組中指定元素的下標可以訪問數組數據,這時數據塊、數組符號名及下標一起 使用。如圖5.5中聲明的數組在DB20(符號名:MOTOR)的個字節處開始,用以下地址訪問數組中的第二個元素:
MOTOR. Heat_2×3[1,2]
4) 利用數組傳遞參數
將數組作為參數傳遞時,要求形式參數和實際參數必須有同樣的數據組織結構、相同 的數據類型,并按相同的順序排列。
2. 構造
構造將不同數據類型組合成一個整體,見圖5.6。構造的元素可以是任何基本數據類型或復式數據類型,有數組或構造元素的構造能嵌套8層。因此,STEP 7允許用戶將過程中的各種關聯數據統一組織在一個構造中,也為統一處理不同類型數據或參數提供了可能性
1) 建立構造
構造(STRUCT)只能在數據塊或變量聲明表中定義。圖5.7所示為由整數(存放數量)、字節(存放原始數據)、字符(存放控制碼)、浮點數(存放溫度)、布爾數(完成標志信號)組成的構造。該構造的名稱為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) 訪問構造
(1) 用符號地址訪問:如MOTO.Stack_1.Temperature,其中,MOTO為構造所在數據塊DB20的符號名。
(2) 用物理地址訪問:如Stack_l從DB20的字節0開始存放,Amount的物理地址是DB20.DBW0,Temperature的地址為DB20.DBD4。
4) 利用構造傳遞參數
構造可以作為參數來傳遞。將構造作為參數傳遞時,要求形式參數和實際參數必須有同樣的數據組織結構、相同的數據類型,并按相同的順序
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ACS550-01-06A9-4/ACS510-01-07A2-4