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6FX1128-1BBOO西門子模塊
6FX1128-1BBOO西門子模塊
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上架日期:2016-02-24 10:51:13
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    6FX1128-1BBOO

    6FX1128-1BBOO

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    BCD碼數(shù)據(jù)外部輸入應(yīng)用設(shè)計(jì)舉例 1.1 設(shè)計(jì)思路   首先介紹SIEMENS(西門子)公司PLC S7—200的物理存儲(chǔ)區(qū)結(jié)構(gòu),一般情況下,物理存儲(chǔ)區(qū)是以字節(jié)為單位的,所以存儲(chǔ)單元為字節(jié)單元,操作數(shù)長度是字或雙字時(shí),標(biāo)識(shí)符后給出的存儲(chǔ)單元參數(shù)是字或雙字內(nèi)的最低字節(jié)單元號(hào)。圖1(a)給出了字節(jié)、字、雙字的相互關(guān)系及表示方法。當(dāng)使用數(shù)據(jù)寬度為字或雙字時(shí),應(yīng)保證沒有生成任何重疊的存儲(chǔ)器字節(jié)分配,例如,字地址編碼應(yīng)采用MW10、MW12、MW14······等偶數(shù)字地址或MW11、MW13、MW15·······等奇數(shù)字地址,由于存儲(chǔ)器字MW10占用MB10、MB11兩個(gè)字節(jié),而MW11則要占用MB11、MB12兩字節(jié),存在字節(jié)地址重疊單元MB11,所以字地址編碼時(shí)奇偶不能兼用,以免造成數(shù)據(jù)讀寫錯(cuò)誤。圖1(b)給出數(shù)據(jù)存儲(chǔ)結(jié)構(gòu),數(shù)據(jù)的高位用MSB表示,低位用LSB表示。 [align=center] 圖1(a) 以字節(jié)單元為基準(zhǔn)標(biāo)記存儲(chǔ)器單元 圖1(b) 存儲(chǔ)器中字節(jié)、字、雙字之間的關(guān)系[/align]   其次,以德國SIEMENS(西門子)公司的S7—200 PLC為例。構(gòu)成加熱控制系統(tǒng),加熱時(shí)間采用三位十進(jìn)制數(shù)的BCD碼撥盤從PLC外部輸入。PLC輸入/輸出接點(diǎn)分配如下表所示:   附表:PLC輸入/輸出接點(diǎn)地址分配

    加熱系統(tǒng)的加熱元件用PLC輸出點(diǎn)Q0.0控制,系統(tǒng)起動(dòng)按鈕由I1.4輸入,復(fù)位按鈕由I1.5輸入。 [align=center] 圖2(a) 主程序流程


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