Configure scatter plot properties

You can set up a scatter plot to show time labels on the data points and use an opacity gradient for line traces to indicate the sequence of data points in time.

Also, you can override the tags’ data retrieval settings so that full or delta mode retrieval is always used in scatter plots.

To configure scatter plot properties:

1. On the Chart menu, click Properties. The Trend Properties dialog box appears.

2. Click the XY Scatter Plot tab.

   

3. In the Data point labeling area, configure the following options:

   Type of labeling	Selected Option	Result
   	Start/End markers only	Start/end markers are displayed, with no time labels on the data points
   	Start/End markers with time labels on current tag	Start/end markers are displayed, along with time labels on the data points
   	Start marker only	Start markers are displayed, but end markers are not displayed
   	End marker only	End markers are displayed, but start markers are not displayed
   	No marker and time labels	No markers or time labels are displayed
   Number of labels	The number of time labels that appear on the chart. The valid range is from 2 to 15, with a default value of 6. The labels are spaced evenly over the time period between the earliest and the latest data point in the chart. (Therefore, they may not be spaced evenly in distance.)
   Marker Size	The size to display the start/end markers in the chart. The valid range increases in size from from 1 to 5, with a default value of 1.

4. In the Trace gradient area, configure the following options:

   Type of gradient	Select Opacity gradient if you want the opacity of the line trace in a scatter plot to change based on the time stamp of the data points that it connects. For example, the trace could be fully opaque at the most recent data point and almost transparent at the oldest data point. Select None if you want the trace to have the same opacity at all data points.
   Starting percent	The opacity of the trace at the oldest data point. 0 means transparent, 100 means fully opaque.
   Ending percent	The opacity of the trace at the most recent data point.

5. Select the Always use Full or Delta retrieval check box if you always want to use Full or Delta mode retrieval for all tags in a scatter plot regardless of the retrieval settings that are configured at the application or tag level. Full retrieval is used when retrieving data from a Historian with a version of 9.0 or higher. Delta retrieval is used for earlier server versions. We recommend to keep this option enabled unless the nature of your data makes full retrieval impractical.

6. Click OK.