Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 55)

3 • Plan applications
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Some people are color blind to red and green so don’t rely on color alone to establish
meaning.
 Use high contrast color combinations, such as yellow on blue.
Display Types
 On Top display type is used to position the display in front of any other display that is
already open at run-time.
 Replace display type is used to have the display close any open displays on the screen
at run-time. Replace displays do not close displays of the type On Top that have the
Cannot Be Replaced option selected. Only one Replace display can be open at a time.
Usability
 If you’re designing for a touch screen, don’t place important buttons where they’ll be
blocked by an On Top display. The user can’t press a covered button. Also, ensure the
button is large enough for users to touch easily.
 Ensure there is always a clear way to move between displays.
 Keep the intended user in mind and design displays so they are easy to understand and
use. Ask the users to test the displays.
Plan languages
Before setting up languages, plan:
 Which languages you need to use.
 Which Windows fonts support these languages.
 For applications running on a personal computer which Windows fonts support
these languages.
 For applications running on a PanelView Plus terminal which languages the fonts
resident on the terminal support.
 How different languages will affect design elements in your graphic displays, such as
object size and message length.
 Whether operators need to switch languages at run time, and if so, under what
conditions. This will help you determine where to locate Language Switch buttons in
your application.
 How to show operators which button to press to switch to their languages. For
example, by using a text label in French, or a French flag, to alert a French operator.
For information about setting up language switching, see Chapter 12.