Trend Chart Overview
The trend chart widget allows you to plot real time data and historical data from Historian servers. You can plot the data using the context of a model or browse for a Historian server. You can then add tags to the chart.
The model contains asset types and assets. The assets have properties associated with them, which are, in turn, associated with tags defined in Historian.
The following image shows an example of a trend chart.
The following table provides the tasks that you can perform on a trend chart.
| Task | Procedure |
|---|---|
| Access the properties used in a trend chart. | The properties used in a trend chart appear in the Legend section. |
| Remove a property from a trend chart. | In the Legend section, in the row containing the property, select  . |
| Increase the area of a trend chart. |
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| Pause the data flow of a trend chart. | In the toolbar, select  . You can resume the data flow by selecting  . This option is available only for the live mode. |
| View the delta value between two data points. | In the toolbar, select  , and select the two data points whose delta value you want to view. The delta value appears in the Legend section. |
| Drill down a trend chart. | In the toolbar, select  to drill down a trend chart for more granular information. You can select  to zoom out of the chart. If you want to zoom in or zoom out a single axis, select the axis in the drop-down list box adjacent to If you want to enlarge an area on the chart, select |
| Pan across a trend chart. | In the toolbar, select  , and then drag the mouse pointer to the area on that chart that you want to view. |
| Mark a trend chart view as favorite. It is an easy way to view the trend chart for commonly used configuration settings. | In the toolbar, select  , enter a name for the view, and then select Add. To access a favorite view, in the drop-down list box adjacent to , select the view. |
| View the statistics of tags plotted on a trend chart. | In the toolbar, select  . The statistical data of the Historian tags used in the trend chart appear below the chart. You can remove the statistical data from below the chart by selecting again. |
| Export the trend chart data. | In the toolbar, select  , and then select  . The trend chart data is exported as a CSV file as defined by the Historian sampling mode for a selected duration. |
| Print a trend chart. | In the toolbar, select , and then select  . |
| Reset the trend chart options. | In the toolbar, select , and then select  . Any changes you have made to the duration, axis preferences, and properties are reverted. |
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. Recommendations While Using a Trend Chart
When you create a trend chart, we recommend that you apply the following guidelines:
- When you add a trend chart to a page using the page designer, use separate containers for the breadcrumb and the chart. For the trend chart, set the height to 100%.
- When accessing a trend chart on a mobile device:
- Use a device with medium to high resolution.
- Use the device in landscape mode.
- To print a trend chart using an Android device, use the screen capture feature rather than selecting .
- Configure the trend chart using a desktop rather than an Android device. This is because when you attempt to search for an asset or a Historian tag on an Android device, the in-built keyboard of the device appears, which may not allow you to enter the search criteria.
- When you view the delta between two data points, the value may not be clearly readable on a mobile device with low to medium resolution. Therefore, we recommend that you view the delta value on a desktop or a mobile device with high resolution.
- When you view statistical data, the trend chart area may be limited. To avoid this issue, plot up to two properties on the trend chart.
- To pan across the trend chart or drill down the trend chart on an iPad, use the Zoom feature of the iPad rather than selecting , , or , respectively.