The following picture shows the default form to edit a trending.
| Field | Description |
|---|---|
| Enabled | Enable (default) or disable the trending. A disabled trending does not log any values until it is enabled again. |
| Name* | The name of the trending (mandatory). |
| Description | Trending description. |
| Item * | Select an item from the item tree. The trending logs the values of this item. |
| Type * | Type of the trending (Mandatory). All: Log all value changes of the item. Average: Log the average value of the item. COV: Log the value of the item when it changes. Delta: Log the delta (difference) of the item's value. Max: Log the maximum value of the item. Meter sampling: Log data in a predefined interval between 5 minutes and 1 hour. Min: Log the minimum value of the item. Pulse: Log the number of received values of the item. Sampling: Log data in a definable interval. Depending on the selected type additional form fields may appear. |
| Max age [days] | Max age of trending data in days. 0 (default): Ignore age of data. Select a number how many days to keep the data of the trending. Older data will be deleted. |
Interval [s] Interval [min] | Time interval in seconds. Time interval in minutes. |
| COV type | Absolute (default): Defines the threshold value as absolute value. Percentage: Defines the threshold value as relative value. |
| Threshold | Log data in the trending when the change of value is grater than the threshold. |
Scaling | Disabled (default): Scaling is turned off. Enabled: Scaling is turned on and a scaling function appears for configuration. |
| Min-Max Validation | Disabled (default): Validation is deactivated. Enabled: Validation is activated. Values outside the min-max range are ignored and not logged to the trending. Additional form fields appear. |
| Min allowed value | Minimum value. |
| Max allowed value | Maximum value. |
| Time program | Disabled (default): Time program is deactivated. Enabled: Time program is activated. The trending logs data in the period defined by Start date/time and End date/time. |
| Start date/time | Start of time range. |
| End date/time | End of time range. |
| Chart | Graphical presentation of the trending data. |
| Range | Default range to view in chart view: Day, Week, Month, Year, Custom. |
| Color | Trending color. |
| Y axis scaling | Dynamic (default): The system will define the best scaling depending on the values. This is a relative representation of the values. 0-based: All trending values appear in an absolute representation. |
| Y axis label | Label of the y axis. |
| Aggregation | Enabled (default): Aggregated values appear in the chart. The aggregated value is the average value for a certain period. Disabled: All values appear in the chart - without aggregation. |