Rockwell Automation Logix5000 Program Parameters Programming Manual - Manual (Page 23)

Connecting program parameters Chapter 1
5. In the Tag box, choose the drop-down arrow.
6. (optional) On the Tag Browser, clear all but the Show controller tags
check box to limit the number of available parameters that appear in the list.
7. In the list of available parameters, double-click the desired parameter.
8. Click OK.
A Public parameter is an encapsulated version of a controller scope tag, and
typically it is used for large data structures that need to be shared among programs.
Public parameter connection types and uses
Public parameters can be connected to Input parameters, Output parameters, and
InOut parameters. Public parameters function like controller scope tags, but are at
the program level. The key benefit to using Public parameters over controller
scope tags is better encapsulation. It is an excellent option for code modules or
objects that contain data that must be globally available to other code modules.
Public parameters
Rockwell Automation Publication 1756-PM021A-EN-P - October 2014 23