Rockwell Automation 1764-xxxx MICROLOGIX 1500 PROGRAMMABLE CONTROLLERS - Manual (Page 106)

Publication 1764-UM001B-EN-P - April 2002
6-4 Using Real-Time Clock and Memory Modules
Program Compare
The memory module can also provide application security, allowing
you to specify that if the program stored in the memory module does
not match the program in the controller, the controller will not enter
an executing (run or remote run) mode. To enable this feature, set the
S:2/9 bit in the system status file. Refer to the MicroLogix 1200 and
MicroLogix 1500 Instruction Set Reference Manual, publication
1762-RM001, for more information.
Data File Download Protection
The memory module allows the user to specify individual data files in
the controller that are protected from the download procedure. This
allows user data to be saved (not overwritten) during a download.
TIP
Data file download protection is only functional if
the processor does not have a fault and if all
protected data files in the memory module exactly
match the protected data file structure within the
controller. Refer to the MicroLogix 1200 and
MicroLogix 1500 Instruction Set Reference Manual,
publication 1762-RM001, for information on
protecting data files during download.