Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 71)

3 • P LANNING AN APPLICATION
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 Use high-contrast color combinations, such as light text on dark-colored backgrounds.
Usability
 If you’re designing for a touch screen, place important buttons where they will not be
blocked by a pop-up window. Users can’t press a covered button.
Also ensure that buttons are large enough and spaced far enough apart for users to
touch them easily, even when wearing work gloves.
 Ensure there is always a clear way to move between displays.
Planning how to use trends
When designing trends, consider how they will be used in the application. For example,
a trend might be used to:
 Analyze process trends.
 Monitor production efficiency.
 Archive process variables to ensure compliance with government regulations.
Based on such considerations, you can determine which tags need to be plotted on the
same trend, from a data log model, against time, or against another tag.
For more information, see Chapter 23, Setting up trends.
Planning run-time language switching
When designing an application that will support multiple languages, consider:
 How operators will switch between languages at run time.
For example, you can create buttons that run the Language command when pressed,
for each language the application supports.
 Whether operators will need to switch languages. If so, ensure that they have
sufficient security privileges to open graphic displays that contain language switching
buttons.
 Displaying the different languages consistently and effectively in graphic displays.
For example, if you use a caption to identify a button set up to switch to French, the
caption will change whenever a language switch occurs. To avoid this, use an image
of the French flag on the button, instead.
For more information, see Chapter 13, Setting up language switching.