Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 508)

F ACTORY T ALK V IEW M ACHINE E DITION U SER ’ S G UIDE
25-2
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 Global object parameters
To use the same graphic display with different sets of tags, use tag placeholders with
parameter files or parameter lists. Using tag placeholders can be quicker than duplicating
a display and setting up the objects in it to use a different set of tags, especially when the
display uses a lot of tags. Using parameter files or parameter lists also reduces the size of
the run-time application file.
You can use tag placeholders wherever you would normally assign a tag to an object,
including in expressions and embedded variables. You can also use tag placeholders in the
expressions you create to animate objects.
Tag placeholders can provide a way to use one graphic display to represent a number of
similar operations. For example, suppose you are creating displays for a plant that cans
corn and peas. The machinery used in both processes is identical. Instead of creating two
displays and specifying corn-related tags in one display and pea-related tags in another,
you can create one display and not specify any tag names. Where a tag name is required,
type a tag placeholder.
Use parameter files or parameter lists to specify which tags to substitute for which
placeholders when a display opens at run time. For information about using parameter
files, see page 25-4.
For information about using parameter lists, see page 25-7.
You can also use tag placeholders with global objects. You can assign tag placeholders to
the connections for base objects, and to connections for reference objects with the
LinkConnections property set to False. For more information about global objects, see
page 25-10.
You can use tag placeholders in:
 The graphic display that opens when the application is first run. Specify the graphic
display to open, and the parameter file or parameter list to use with it, in the Startup
editor.
 Graphic displays that are opened using Goto display buttons. Specify the graphic
display to open, and the parameter file or parameter list to use with it, when you set up
the button.
 Graphic displays that are opened using display list selectors. Specify the graphic
displays to open, and the parameter files or parameter lists to use with them, when you
set up the display list selector.
 The graphic display that opens when a logout button is pressed.
 The graphic display specified in the Project Settings Runtime tab when auto logout
is enabled.
 Displays specified in the Display tab of the Global Connections editor.