AVEVA Historian Server Practice Exam 2025 – Complete Study Resource

The method that records when the value has changed outside a defined range is known as Delta with value deadband. This approach is designed to minimize unnecessary data logging by ignoring small fluctuations within a specified deadband, or tolerance range. When the value changes beyond this range, it indicates a significant variation that needs to be captured; this is why the method accurately records changes that are meaningful for analysis, making it highly effective for identifying trends or occurrences outside of expected operational parameters.

In contrast, other methods like Delta with swinging door may record data based on previous values and defined thresholds, but they do not specifically focus on changes outside a predefined range. Similarly, Cyclic methods log data at regular intervals, regardless of value changes, and Forced methods allow for data recording upon manual triggering rather than specific value conditions. Therefore, Delta with value deadband is the most suitable choice for recording significant changes that exceed defined limits.