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PI Interface for OPC Alarms and Events

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  • Last UpdatedOct 21, 2026
  • 1 minute read

System Errors and PI Errors

System errors are associated with positive error numbers. Errors related to PI are associated with negative error numbers.

Error Descriptions on Windows

On Windows descriptions of system and PI errors can be obtained with the pidiag utility:

Windows: \PI\adm\pidiag – e error_number