Points dialog
The Points dialog is used to configure the data points for a Trend Control screen object. The value of each data point is represented as a pen in the trend display. You can dynamically change which data points are visible during runtime, regardless of how many data points are associated with the screen object.
Accessing the dialog
To access the Points dialog for a specific Trend Control screen object, first access the Object Properties dialog for that screen object and then click Points.
The dialog in detail
Figure 1. Points dialog
The following table summarizes the properties of each data point:
| Column Name | Description |
|---|---|
| Point | A unique ID number for the point, which is assigned automatically when the point is created in this interface. |
| Label | The label associated with the Point can be displayed on the Legend, during runtime, providing a short reference to the user for each Point. |
| Color | The color of the pen usedColor of the pen used to draw the values of the Point on the Trend Control object. |
| Data Source | The data source for this point. Tag is available by default, but all other sources must be configured in the Data Sources dialog. |
| Tag/Field | The meaning of this parameter depends on the Data Source type associated with the data point:
|
| Min Scale / Max Scale | The scale of the Y-axis for this point. This overrides the default scale that is set in the Axes dialog.
Note: The Min Scale and Max Scale properties can hold real numeric values up to six decimal places. If you need more precision than that, then you must configure the Min Scale and Max Scale properties with Real tags and then store the values in those tags.
|
| Style | The line and marker styles for this point; click the  button to open the Pen Style dialog.
|
| Options | Additional options for this point; click the button to open the Options dialog.
|
| SPC | Calculated statistics to be used in statistical process control (SPC); click the button to open the SPC dialog.
|
| Hide | Tag trigger — when the value is TRUE, the data point is hidden in the trend display. |