Rockwell Automation 20D-DL2-CKS1 Import/Export Project Components - Manual (Page 57)

Chapter 7
Additional considerations for tags
This chapter explains import and export of referenced tags.
Tip: Starting with version 24 of Logix Designer application, you can use program parameters to share data between
programs in much the same way that you use controller-scoped tags. Program parameters are imported and
exported in the same way as tags in most instances. For more information on program parameters, see
Logix5000
Controllers Program Parameters Programming Manual , publication 1756-PM021 .
Tags are not exported to an .l5x file themselves, but they are exported to the .l5x
file as part of a program, equipment phase, or Add-On Instruction export
(program-scoped tags with a program export, equipment phase-scoped tags with
an equipment phase export, and parameters and local tags with an Add-On
Instruction export).
Tags may also be exported to an .l5x file as references from another component
being exported (controller-scoped tag references with a program or equipment
phase export or program-scoped and controller-scoped tag references with a rung
or routine export). The definitions for the referenced tags are exported to the .l5x
file by default if they exist in the project.
When exporting logic, especially if it is intended for general use, be aware that
logic that references a bit member of a tag or member of a user-defined data type
tag cannot be replaced during import to reference another bit or user-defined data
type member. If you expect to connect the logic reference to another bit or
member of a tag, consider editing the logic before export so the reference is to a full
tag name (and alias if need be) so that the reference can be connected to the
desired tag on import.
When you import a program, the program-scoped tags are imported with the
program automatically (the same as they are for equipment phase). When you
import an Add-On Instruction, the parameters and local tags are imported with
the Add-On Instruction automatically.
During program or equipment phase imports, referenced controller-scoped tags
may also be imported. For routine and rung imports, referenced tags may be
imported as well. You configure how referenced tags are imported during import
configuration. By default, referenced tags that collide with project components are
not imported.
Keep the following considerations in mind when importing tags.
Introduction
Export considerations
Import considerations
Rockwell Automation Publication 1756-PM019E-EN-E - October 2014 57