L-Gate User Manual 129 LOYTEC
Version 3.2 LOYTEC electronics GmbH
3. Add data points to be trended. Click on Add … which opens a data point selector
window.
4. Select the data points and click OK. For each of the attached data points, a line appears
in the list below the add button. The trended data points will also appear with the trend
icon
in the data point manager.
Tip! Data points can also be attached to a trend by selecting a data point in the data point tab,
drag it onto a trend object and drop it on the trend object.
5. Data points can be removed from the trend by clicking Remove.
6. If COV mode was selected, the COV increment is displayed in the COV delta column.
This value can be increased to produce less trend data. Note, that it cannot be lowered
under the trended data point’s own COV increment. Go to the data point configuration
to change the COV increment in this case.
7. If the trended value of the data point shall be aggregated over the log interval, select
the desired aggregation in the Type column. Available options are Min, Max, Avg.
Tip! For creating multiple curves with min, average, and maximum values, add the same data
point three times and select the different aggregation types.
8. In addition, a special Trend Enable data point can be selected. If configured, the trend
log will only log data, if the value of this data point evaluates true, i.e., is not zero.
Click the … button to select a data point.
9. To remove the enable data point, click the Remove button.
10. When done with the data point setup, click Save Changes to leave the dialog.
Tip! A shortcut to creating a trend log object and attaching a data point is to select a data point
in the data point manager, right-click on it and choose Trend Datapoint from the context
menu. This generates a trend log and links that data point to it.
6.14.3 Trend Triggers
Local trend objects in CEA-709 can be operated in trigger mode. In this mode, one or more
trigger data points cause the generation of a snapshot containing the values of the trended
data points at the time instant the trigger is activated. For a trend object, one or more trigger
conditions can be defined. Depending on the trigger data point type, the trigger conditions
can be refined.
Note, that the behavior of the trigger data point is influenced by the COV properties of the
data point. If the Only notify on COV property is checked, the data point triggers only if
its value changes to the value of the trigger condition. If that property is not checked, the
data point triggers on every write with a value that matches the trigger condition.
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