Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 433)

16 • C REATING GRAPHIC DISPLAYS
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FactoryTalk View graphics are resolution independent. This means that no matter what
resolution you use to create graphic displays, they are resized automatically to suit the
monitor on which they are shown at run time.
Showing the last known values of HMI tags
You can set up a graphic display to show the last known value for each HMI tag in the
display, until current values arrive from the programmable controller.
In many applications, selecting this option will help to show graphics more quickly.
At run time, if a display is not set up to show the last known value of HMI tags, objects
with values that have not yet been updated appear in outline form. The outline indicates
that data is not current, or is in error.
Graphic objects might appear in outline form the first time a display starts, if the HMI
tags used in the display are not initialized.
Once the tags are initialized and values arrive, the objects appear in their normal form.
However, if data is unavailable or in error, the objects will remain in outline form.
Setting the update rate for tags
The maximum tag update rate is the fastest rate at which data servers can send tag value
changes to the graphic display.
Set the update rate as fast as, or faster than, the rate at which the values of tags used in the
expressions change, unless it is desirable to miss changes in tag values.
The default update rate is one second. This means that data servers will not send tag value
updates faster than once every second.
Specifying the size of the graphic display
You can use the current size of the display or specific the width and height in pixels. Click
Use Current Size to specify that the size of the display in the edit window will be its
natural size at run time. Click Specify Size in Pixels to specify a width and height in
pixels for the display. For more information, refer to the FactoryTalk View Site Edition
Help.
Preventing scroll bars on the main window
If a graphic display is larger than the FactoryTalk View SE Client main window, scroll
bars will appear on the window when the display is started.
The last acquired value can be shown for HMI tags only. For other kinds of tags, the last value
cannot be retained.