Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 619)

23 • S ETTING UP TRENDS
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About the Trend graphic library
The Trend graphic library contains a real-time trend, and objects for controlling the trend.
You can use the trend and objects as they are, or you can modify them to suit your needs.
To use the objects, drag and drop them into a graphic display.
To open the Trend graphic library
1. In FactoryTalk View Studio, in the Explorer window, open the Graphics folder.
2. In the Libraries folder, right-click Trend, and then select Open.
Working with trends at run time
How you can interact with a trend at run time depends on the options you set up in the
Runtime tab of the Trend Properties dialog box.
You might be able to do some or all of the following:
 View and modify trend properties.
 Modify legend properties.
 Pan or zoom on the trend chart.
 Use the trend chart’s shortcut menu.
For details about options in the Runtime tab, click Help.
Collecting data in the background at run time
Real-time trends collect data only while the trend is shown. This means that a real-time
trend will not contain any data, when the graphic display opens.
This can be a problem if the trend chart is not open for the entire time the application is
running, or if other graphic displays are opened before the trend display.
If you want a trend to contain data when the graphic display opens, you can use a data log
model, or you can run startup macro, to load and update the display in the background.
This loads data into the data buffer for the trend.
You can run a startup macro when the HMI server runs. For information about setting up startup
components for an HMI server in various types of networks, see Chapter 6, Working with
network distributed applications, Chapter 7, Working with network station applications, and
Chapter 8, Working with local station applications.