i4connected Knowledge Base

This article describes how Gap Detection and Interpolation mechanisms operate within the i4connected system.

The Gap Detection feature enables the detection of missing data points in a signal’s measurements. The Interpolation feature calculates the missing data points in a gap by dividing the difference (between the last received data before the gap and the first one after) by the gap time span (divided into 15-minute periods).

The Gap interval is defined when adding or editing signals.

The Gap interval

The server recognizes a gap every time when (at least) one measurement is not collected for a 15-minute period. As the adapter might be collecting historical batched data, the gap detection is only triggered when a new value is collected, thus ending the gap. When the server detects the gap, a new Gap detected alarm is raised from the source device, with start and end times equal to the gap size.

Let's take as an example the image below:

Gap detection plot

The dashed line represents the detected gap. In this example, the gap is detected between 0:15 and 1:45. The Gap detected alarm would be raised with the start time equal to 0:15 and the end time equal to 1:45.

To enable Gap Detection set the Interpolate property of the signal to not null. The options of the Interpolate property are: