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樓主  發(fā)表于: 2008-07-20 09:27
S7200與S7300之間采用MPI通訊方式時(shí)， S7200 PLC中不需要編寫(xiě)任何與通訊有關(guān)的程序，只需要將要交換的數據整理到一個(gè)連續的V 存儲區當中即可，而S7300中需要在OB1（或是定時(shí)中斷組織塊OB35）當中調用系統功能X_GET（SFC67）和X_PUT(SFC68)，實(shí)現S7300 與S7200之間的通訊，調用SFC67和SFC68時(shí)VAR_ADDR參數填寫(xiě)S7200的數據地址區，這里需填寫(xiě)P#DB1.××× BYTE n 對應的就是S7200 V存儲區當中VB××到VB（××＋n）的數據區。

首先根據S7300的硬件配置，在STEP7當中組態(tài)S7300站并且下載，注意S7200和S7300出廠(chǎng)默認的MPI地址都是2，所以必須先修改其中一個(gè)PLC的站地址，例如將S7300 MPI地址設定為2，S7200地址設定3，另外要分別將S7300和S7200的通訊速率設定一致，可設為9.6K，19.2K，187.5K三種波特率。

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