Rockwell Automation Logix5000 Controllers I/O and Tag Data Programming Manual - Manual (Page 44)

Chapter 2 Organize tags
In version 13 or later, the Logix Designer application lets you automatically build
descriptions out of the descriptions in your user-defined data types. This greatly
reduces the amount of time you have to spend documenting your project.
As you organize your user-defined data types, keep in mind the following features
of the Logix Designer application.
Item Description
Pass through of descriptions—When possible, the Logix Designer application looks for an available
description for a tag, element, or member.
− Descriptions in user-defined data types ripple through to the tags that use that data type.
− Description of an array tag ripples through to the elements and members of the array.
Append description to base tag—the Logix Designer application automatically builds a description for
each member of a tag that uses a user-defined data type. It starts with the description of the tag and then
adds the description of the member from the data type.
Describe a user-defined
data type
44 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014