i4connected Knowledgebase 5.6

The Gap Detection feature

Abstract

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

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

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

As stated before, the Gap Detection feature enables detecting missing data points in a signal’s measurements. The Gap interval is defined when adding or editing signals.

Gap_interval.jpg

The Gap interval

The server recognises a gap every time when (at least) one measurement is not collected for a 15 minutes 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:

GapDetection1.png

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:

  • null: Gap Detection and Interpolation disabled;

  • false: Gap Detection enabled, Interpolation disabled;

  • true: Gap Detection and Interpolation enabled.