Read Log data in Datalayer in PLC

[WesleyTsai]

Hello, I would like to read Log data in PLC, but the data return is always wrong data.

I used these 2 functions "DL_ReadNodeValue" and "common_log_diagnosis_fbs_DiagnosisIdentification" to read MainDiagnosisNumber, DetailedDiagnosisNumber and Entity back to PLC.

But the data return only "(" in Main Diagnosis, "timestamp" in Detailed Diagnosis and no data return in Entity.

I using the same programs to read PLC info by CXA_PLC_fbs fuction, the results returned correctly without problem. Could you help me check whether there is any mistake of the fuction of read diagnosis log?

Thanks.

[bostroemc · Accepted solution]

Data layer node diagnosis/get/actual/log is associated to schema types/diagnosis/identification-timestamp.  The POU for this schema is common_log_diagnosis_fbs_DiagnosisIdentificationWithTimestamp, not common_log_diagnosis_fbs_DiagnosisIdentification.

After the initial call to DL_ReadNodeValue, use common_log_diagnosis_fbs_DiagnosisIdentificationWithTimestamp to get the root structure, then a pointer to common_log_diagnosis_fbs_DiagnosisIdentification to get the inner structure:

EDIT: Tested with ctrlX CORE 2.6.x, but should apply equally with ctrlX CORE 1.20.x.

[HmiGuide]

Please always tell which ctrlX version you are using, while newer ctrlX version have more FB's which might help you.

[WesleyTsai]

I have already tried it in ctrlX CORE 2.4.0, it could use without problem.

Thanks a lot.