6ES7331-7NF00-0AB0 模擬量輸入模塊 8路

如何使用 SFC65，SFC66，SFC67 和 SFC68 進行通信

對于單向基本通信，使用系統功能 SFC67（X_GET）從一個被動站讀取數據，使用系統功能 SFC68（X_PUT）將數據寫入一個被動站（服務器）。這些塊只有在主

動站中才調用。對于一個雙向基本通信，調用站中的系統功能 SFC65（X_SEND），在該站中想將數據發送到另一個主動站。在同樣為主動的主動接收站中，數

據將通過系統功能 SFC66（X_RCV）記錄。

兩種類型的基本通信中，每次塊調用可以處理多 76 字節的用戶數據。對于 S7-300CPU，數據傳送的數據一致性是 8 個字節，對于 S7-400CPU 則是全長。如果

連接到 S7-200，考慮到 S7-200 只能用作一個被動站。

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