Meaning
Systematic review of the historical data and event records generated by a supervisory control and data acquisition system. A scada log audit verifies the integrity of sensor readings, operator interventions and automated alarms over a specific production period. This process identifies discrepancies between the intended machine behavior and the actual performance recorded in the digital archive.
It provides a defensible trail for regulatory compliance and safety investigations.
Data Integrity
Engineers examine the timestamps and values to ensure that no tampering or data loss has occurred. During a scada log audit, the team looks for patterns of stale data that might indicate a failing sensor or a communication bottleneck. This verification is essential for trust in the automated reports used by management to make capacity decisions.
Incident Reconstruction
Detailed analysis of the sequence of events helps find the root cause of a production failure or a safety trip. If a machine breaks down, the scada log audit reveals whether the operator ignored a warning or if the system failed to trigger an alarm. This forensic capability distinguishes between human error and mechanical fatigue.
Performance Benchmark
Long-term trends extracted from the records show how the efficiency of the plant changes as the equipment ages. A scada log audit compares the current cycle times against the pilot results established when the line was first commissioned. This comparison highlights where the production yield is slipping and where maintenance is most needed to restore the original demonstrated rate.
