1771-VHSCK控制器
S7200與S7300之間采用MPI通訊方式時， S7200 PLC中不需要編寫任何與通訊有關(guān)的程序，只需要將要交換的數(shù)據(jù)整理到一個連續(xù)的V 存儲區(qū)當(dāng)中即可，而S7300中需要在OB1（或是定時中斷組織塊OB35）當(dāng)中調(diào)用系統(tǒng)功能X_GET（SFC67）和X_PUT(SFC68)，實(shí)現(xiàn)S7300 與S7200之間的通訊，調(diào)用SFC67和SFC68時VAR_ADDR參數(shù)填寫S7200的數(shù)據(jù)地址區(qū)，這里需填寫P#DB1.××× BYTE n 對應(yīng)的就是S7200 V存儲區(qū)當(dāng)中VB××到VB（××＋n）的數(shù)據(jù)區(qū)。
首先根據(jù)S7300的硬件配置，在STEP7當(dāng)中組態(tài)S7300站并且下載，注意S7200和S7300出廠默認(rèn)的MPI地址都是2，所以必須先修改其中一個PLC的站地址，例子程序當(dāng)中將S7300 MPI地址設(shè)定為2，S7200地址設(shè)定3，另外要分別將S7300和S7200的通訊速率設(shè)定一致，可設(shè)為9.6K，19.2K，187.5K三種波特率.
分別在STEP7 MicroWin32 和STEP7當(dāng)中監(jiān)視S7200和S7300 PLC當(dāng)中的數(shù)據(jù)，
通過CP5611，STEP7 MicroWin32， Set PG/PC Interface可以讀取S7200和S7300的站地址，
站地址0代表的時進(jìn)行編程的PG，即當(dāng)前連接PLC的PC。
公司名稱：廈門潤星貿(mào)易有限公司
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