描述

6RB2110-0FF01

在它上面我曾經(jīng)吃過虧，一個晚上幾個小時，翻來覆去倒騰好幾次變量，都是因為這個減號。這里，我只需要提兩件事大家可以測試一下：你在單獨起變量名字的時候，不管在S7中還是WINCC中，都是合法的可以使用的，但如果使用WINCC7.2的變量表復(fù)制粘貼功能，你從WINCC復(fù)制到EXCEL還是可以的，但倒過來復(fù)制的時候，所有變量名里面的減號都給變成了下劃線(_)。還有是，如果是模擬量需要進行變量歸檔，如果又使用了壓縮歸檔，那么在壓縮以后，不知道啥時候變量名也給變成了下劃線(_)!是的。原來最好用的是下劃線。其實也只有下劃線最好用，所以所有人在命名的時候本來也都喜歡用它，最終一個完整的位號加功能鏈接起來后的變量就會到泛濫的程度，這就就又出現(xiàn)問題了。比如：LS_DT_8_LEAK_FLS_DT_9_LEAK_FLS_DT_12_LEAK_FLS_DT_13_LEAK_F這些變量名，在WINCC中使用是沒有問題的，但如果我要用到變量前綴功能呢？如果WINCC程序處理中需要通過變量的分隔符來確定位號和功能，這么多下劃線可就亂套了。在去年年底的一個項目中，我曾經(jīng)非常痛苦的每天晚上花4-5個小時來處理幾千個變量的變量表，配合方每發(fā)來一次更新的變量表，我就要處理一次，以達到程序可用的規(guī)范。更換掉不可以使用的字符，更換掉不合適的使用了下劃線的變量。直到最后，項目已經(jīng)完工了，突然想到了一個更容易的解決方案，既然濫用下劃線，那索性更濫用好了，分隔符的地方，使用連續(xù)兩個下劃線(__)可好？比如上面的變量名就變成：LS_DT_8__LEAK_FLS_DT_9__LEAK_FLS_DT_12__LEAK_FLS_DT_13__LEAK_F我只要和配合方在遞交變量點表的時候提前約定這樣一個規(guī)范不就OK了么！然后轉(zhuǎn)過年來，又一個WINCC報表項目，我查了下項目中的變量的命名方式，直接提出了這樣的要求，所以變量名字就變成了：FT-2128__LFT-2128__SFT-2128__DFT-2128__MFT-BCEG01__LFT-BCEG01__SFT-BCEG01__DFT-BCEG01__M當(dāng)然朋友在做的時候是一頭霧水，不明白為啥要這樣，現(xiàn)在看到這里，應(yīng)該也明白了吧！至于變量名中還有的減號，因為變量已經(jīng)建立，已經(jīng)既成事實，就只好將錯就錯了。

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PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換一年質(zhì)保大量現(xiàn)貨? 國內(nèi)實力庫存商家

6RB2110-0FF01

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