Rockwell Automation 20D-DL2-CKS1 Import/Export Project Components - Manual (Page 12)

Chapter 1 Import and export logic components
4. (Optional) In the File description, edit the default description or type a
description, if desired.
A default description is supplied for some component exports.
Tip: The file description can be viewed in a tooltip during import when selecting which file to import.
5. Click Export.
This section covers general considerations for all component-type imports. See the
chapters for specific components (program, routine, rungs, Add-On Instructions,
user-defined data types, and tags) for additional export and import considerations
for that component, whether it is imported directly or as a reference during
another component import.
Important: When editing online, if the program scan time is large, or the number of modified rungs is large, you might
see HMI and Logix Designer communication timeouts when edits are finalized.
The timeout is caused by the (scan time) x (number of changed rungs). You could have a large program with
a very fast scan, or a lot of rungs (but you modified only a few), and you do not see a timeout.
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 the
Logix5000 Controllers Program Parameters Programming Manual, publication 1756-PM021 .
Online Import
Topic Consideration
Tag data values When overwriting tags while online, data values are not written to the online project. Data
values for overwritten tags while online are written only to the offline project.
Data values for tags created while online are written to the offline and online project.
Select the Preserve existing tag values in offline project check box to prevent tag values
from being overwritten in the offline project.
Locking controller edits When performing an online import, the controller is locked, preventing other workstations
connected to the controller from making edits until the import completes. If another
workstation has the controller locked, an online import cannot be initiated.
Tag attributes Tag attributes (for example, External Access, Constant, and Style) are written to the online
project and the offline project.
If existing tags are to be overwritten with new attributes that are incompatible with existing
user logic, the import is not allowed.
Import considerations
12 Rockwell Automation Publication 1756-PM019E-EN-E - October 2014