點擊圖片查看大圖190E-BNB2-DB63C現(xiàn)貨
本公司專業(yè)銷售大型進口各種品牌DCS系統(tǒng)模塊備件：主營產(chǎn)品：DCS集散式控制系統(tǒng)、PLC可編程控制。
主要業(yè)務: ABB DCS卡件Ovation系統(tǒng)模塊Foxboro系統(tǒng)卡件Triconex系統(tǒng)模塊
Rexroth力士樂全系列產(chǎn)品Modicon停產(chǎn)模塊 等各類工控產(chǎn)品施耐德140系列CPU,PLC
西門子6DD，6FX，6SC，6FC，6S5系列AB1746，1756，1747，1785系列PLC
GE 通用電氣 發(fā)那科
L LD4 AR1+P#2.0→AR1
+ L#16 ACC1+(．．_0001_0 000)
T LD4 調整模入模塊地址指針，指向下一通道Acc1+(bb bbbb bxxx)
L LD8
+ L#16
T LD8 調整數(shù)據(jù)塊存儲地址指針，指向下一存儲地址
L LW0 將循環(huán)次數(shù)計數(shù)器LW0的值裝入累加器1
LOOP NEXT 若累加器1的值不為0，將累加器減1繼續(xù)循環(huán)；若累加
器為0，則結束
在FC100中，寄存器間接尋址指令OP NDB[LW0]使用了臨時本地數(shù)據(jù)LW0，變量表中定義的臨時變量雖然也在L堆棧中，但不能用于存儲器間接尋址，從這里也可看出臨時本地數(shù)據(jù)與臨時變量的區(qū)別。程序中LW2、LD4和LD8起的作用也可用臨時變量替代。
下面舉例說明如何使用FC100。在某應用中，機架0的4號槽位安裝了一個8模入模塊(地址256開始)，若要將前6個模入模塊信號讀回，存入DB50.DBW10開始的6個字單元中，可按下列形式調用FC100：
CALL FC100
PIW_Add：= 256
CH_LEN：= 6
DB_No：= 50
DBW_Addr：= 10
數(shù)據(jù)塊
數(shù)據(jù)塊定義在S7 CPU存儲器中，用戶可在存儲器中建立一個或多個數(shù)據(jù)塊。每個數(shù)據(jù)塊可大可小，但CPU對數(shù)據(jù)塊數(shù)量及數(shù)據(jù)總量有限制，如對于CPU314，用作數(shù)據(jù)塊的存儲器多為8 KB(8192 B)，用戶定義的數(shù)據(jù)總量不能超出這個限制。對數(shù)據(jù)塊必須遵循先定義后使用的原則，否則，將造成系統(tǒng)錯誤。
1. 定義數(shù)據(jù)塊
在編程階段和運行程序中都能定義數(shù)據(jù)塊。大多數(shù)數(shù)據(jù)塊是在編程階段用STEP 7開發(fā)軟件包定義的，定義內容包括數(shù)據(jù)塊號及塊中的變量(包括變量符號名、數(shù)據(jù)類型以及初始值等)，定義完成后，數(shù)據(jù)塊中變量的順序及類型決定了數(shù)據(jù)塊的數(shù)據(jù)結構，變量的數(shù)量決定了數(shù)據(jù)塊的大小。數(shù)據(jù)塊在使用前，必須作為用戶程序的一部分下載到CPU中。
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190E-BNB2-DB63C
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190E-BNB2-DB63C
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