Trend Rule Type

The Trend rule type checks whether the measured value trends away from the calculated target fit line:

• Calculation of the Target fit line:

  Line between the oldest measured value and the sum of the oldest measured value and the configured target value

• Calculation of the Current best fit line:

  Line calculated from all measured values

• Comparison of the two lines:

  If the current best adjustment line is above or below the target adjustment line, an event is triggered.

Rule type variant: Trend (Method of Least Squares, Time-Based or Normalized) Rule Type

Example

There is a temperature sensor in the machine. Over time, the temperature rises steadily. The difference within one minute should not exceed 5°C.

If the temperature suddenly rises faster than the trend within one minute, an event is triggered.