Publication 1766-RM001A-EN-P - October 2008
48
Controller Memory and File Types
User Program Transfer Requirements
Data File Download Protection only operates when the following
conditions are met during a User Program or Memory Module download
to the controller:
•
The controller contains protected data files.
•
The program being downloaded has the same number of protected
data files as the program currently in the controller.
•
All protected data file numbers, types, and sizes (number of
elements) currently in the controller exactly match that of the
program being downloaded to the controller.
If all of these conditions are met, the controller will not write over any
data file in the controller that is configured as Download Protected when
a program is downloaded from a memory module or programming
software.
If any of these conditions are not met, the entire User Program is
transferred to the controller. Additionally, if the program in the controller
contains protected files, the Data Protection Lost indicator (S:36/10) is set
to indicate that protected data has been lost. For example, a control
program with protected files is transferred to the controller. The original
program did not have protected files or the files did not match. The data
protection lost indicator (S:36/10) is then set. The data protection lost
indicator represents that the protected files within the controller have had
values downloaded and the user application may need to be
re-configured.
Access the Download Data File Protect feature
using RSLogix 500/RSLogix Micro
programming software. For each data file you
want protected, check the Memory Module/
Download item within the protection box in
the Data File Properties screen as shown in this
illustration. To access this screen, right click the
desired data file.
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