A20B-2900-0560

A20B-2900-0560

支持診斷的信號模塊和功能模塊將檢測內部和外部錯誤，并生成診斷中斷（可通過調用中斷 OB 對其進行響應）。與錯誤事件有關的 OB 編碼和開始信息提供有關錯誤原因和位置的初始信息。

然后可以通過在此錯誤 OB 中調用 SFB54（讀取附加的中斷信息）獲得詳細的錯誤事件信息。

SFB54 功能

SFB54“RALARM”將從支持診斷的所有模塊讀取中斷數據，而不管這些模塊是插入到中央機架中還是用在 PROFIBUS DP 或 PROFINET IO 中。

此信息將寫入到輸出參數 STATUS、ID、LEN、TINFO 和 AINFO。可以在 TINFO 目標區域中找到 OB 啟動和管理信息。頁眉信息和附加的中斷信息（例如，發生短路）位于 AINFO 目標區域中。

通過在 OB82 中調用 SFB54 進行診斷

如果支持診斷的模塊檢測到錯誤，它將向 CPU 輸出診斷中斷請求（不管是進入事件還是離開事件）。這要求已對相關模塊啟用診斷中斷。操作系統調用 OB82 以對診斷請求進行響應。

OB82 的局部變量包含邏輯基址和關于故障模塊的四個字節的診斷數據。如果未對 OB82 進行編程，則 CPU 狀態將更改為 STOP。

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