The Trend (method of least squares, time-based or normalized) rule type models a trend line in the measurement series. The gradient of the trend line is monitored.
Rule type variant: Trend Rule Type
Example
In the case of an injector, the supply of fluid is controlled by the decrease in the fill level. The rate of the decrease in liquid in the machine is calculated as a trend based on past data (e.g. from the previous minute, as an example period of time).
If a loss of fluid occurs and the current fill level is therefore outside the previous trend line, an event is triggered.