DataPtr數(shù)據(jù)指針：

如果是讀指令，讀回的數(shù)據(jù)放到這個數(shù)據(jù)區(qū)中 ；

2. 如果是寫指令，寫出的數(shù)據(jù)放到這個數(shù)據(jù)區(qū)中 。

Done 完成位：讀寫功能完成位 。

Error錯誤代碼： 只有在 Done位為1時，錯誤代碼才有效。

常用的控制字：

047E ：運行準備

047F ：正轉(zhuǎn)啟動

0C7F ：反轉(zhuǎn)啟動

04FE ：故障確認

5.2.2 寫速度設定值 6、分配庫存儲區(qū)

在編譯程序之前，首先要為Modbus庫分配可用的全局 V存儲器地址，如圖6-1所示。

一步：選擇 “程序塊" ->“ 庫" 右鍵，選擇“庫存儲區(qū)"；

第二步：點擊 “建議地址"， 選擇 V存儲器的地址；

第三步：點擊 “確定"退出。 、調(diào)試程序

程序編輯完成后，要調(diào)試程序，如下圖7-1所示。

一步：點擊“保存“，保存好編輯的程序；

第二步：點擊“編譯“，編譯程序；

第三步：點擊“下載“，把程序下載到PLC的CPU當中； 第四步：點擊“運行“，啟動程序。控制字：VW100=16#047F 說明啟動命令已經(jīng)給了。

狀態(tài)字：VW300=16#EF37 說明變頻器的狀態(tài)，參見 r0052。

主設定值：VW200=16#1000 說明速度設定值已經(jīng)給了，16#0-4000對應轉(zhuǎn)速 0-P2000的值。

速度實際值：VW302=16#1000 說明電機實際轉(zhuǎn)速已經(jīng)運行到 375rpm。 斜坡上升時間：VW400=1000，從寄存器列表中可以看到 40322的寄存器的定 標系數(shù)是 100，所以參數(shù) P1120=1000/100=10。

斜坡下降時間：VW402=2000，讀的下降時間；VW500=2000，設定的下降時 間；VW402=VW500，說明寫指令已經(jīng)生效。從寄存器列表中可以看到 40323 的寄存器的定標系數(shù)是 100，所以參數(shù) P1121=2000/100=20。

9、Modbus錯誤代碼

Done完成位：Modbus功能塊的完成位，用于確定功能塊的操作是否完成；

Error 錯誤代碼：只有在Done位為1時，錯誤代碼才有效。

strategy for the immediate future only. With a short-term brａnd image, you will be losing out on one of the most significant aspects of branding, and that is the benefit which can be gained from having a brａnd that lasts, that survives the storms and comes out floating beautifully, if you'll pardon the metaphor.

Most brａnd images only tend to be truly successful once they have been weathered a bit. A new name, a new logo, a new image might attract some attention initially simply because of its novelty. However, novelty, like fashion, becomes tired and yesterday's news. What comes after novelty? Not a great deal, unless you've planned for the longer journey. Plan your corporate brａnd with a view to making it last beyond the immediate future, and see it as a means of taking your business well into the future.

Another aspect of a corporate branding strategy which should be considered very seriously is consistency. People appreciate a brａnd image that is consistent wherever that business happens to be featured. This includes everything from your letter headed notepaper to your storefront, from your portfolio leaflets to your website, and from your business card to your trade show stands.

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Consider a website for example, where your banner image can be 800 pixels wide, and a couple of hundred or more high - plenty of room for a long name, a long slogan and a few images. But what of your business cards? Can you achieve the same impact and immediate brａnd recognition within a space just a few centimeters square?

A good plan when it comes to creating a successful corporate brａnd is to consider not only the market place, but also your