What method records when value changes beyond a defined rate?

The correct answer is the method known as "Delta with swinging door." This method is designed to efficiently monitor and record changes in data values that exceed a pre-established rate, allowing for selective logging based on significance rather than continuous logging of every minor fluctuation.

The "swinging door" concept enables the system to track only those changes that fall outside a dynamically adjusted range (the "door") around the last recorded value. As a result, if the data changes significantly — surpassing a defined threshold or rate — it will be recorded. This not only helps in managing the volume of data more effectively but also focuses on capturing meaningful variations that are essential for analysis and decision-making processes.

In comparison, the other methods focus on different criteria. For instance, the cyclic method records data at fixed time intervals, which may lead to capturing a lot of insignificant changes. The delta with value deadband, on the other hand, records changes based on a set value threshold rather than a rate of change. Finally, the forced method records data regardless of any conditions, which can lead to excessive and redundant data collection. Thus, "Delta with swinging door" stands out as the most appropriate method for tracking significant changes effectively while maintaining data efficiency.