Check your communication with the PLC. A08526 indicates the PLC is not sending the correct control word (bit 10 must be high).
Diagnosing 0A7991 requires a systematic elimination of possibilities. Here are the five most common physical and parametric causes. siemens fault 0a7991
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According to Siemens Technical Support documentation (List Manuals), fault code falls under the umbrella of "Motor blocked" or "Vapor lock" . Depending on the application: Check your communication with the PLC
Once finished, the alarm will automatically clear, and parameter p1900 will reset to 0 . the alarm will automatically clear