西門子 200Plc 通過 PPI 協(xié)議與組態(tài)王通訊失敗，為何？
請檢查如下設置是否正確：
1）用戶編程電纜的撥碼設置：在編程電纜的撥碼中，第 5 個端子是設置通訊協(xié)議的：撥碼設置為 0，表示 PPI/Freeport ；撥碼設置為 1，表示 PPI(master)；用戶使用 PPI 協(xié)議和組態(tài)王通訊時，撥碼選擇 PPI/Freeport 對應撥碼值即可；
2）PPI 通訊傳輸?shù)氖?11 位的數(shù)據(jù)，也就建議客戶撥碼選擇 8 數(shù)據(jù)位 1 停止位偶校驗（撥碼默認為 11 位），并且 PLC 的波特率和 PPI、組態(tài)王要一致；
3）要求編程軟件必須是離線時啟動運行組態(tài)王。
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