Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 155)

MicroLogix 1000 and PLC-500 A.I. Series Software Reference
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However, you can:
•
clear the processor memory
•
transfer the contents of a memory module into the processor memory
•
restore (download) a different program to the processor
!
If you lose or delete the offline copy of the program, you cannot access the program
in the controller. You must clear the controller memory and re–enter the program.
If you make online edits with a SLC 5/03 or 5/04 processor, be sure to save the edits
when exiting the online editor; otherwise, you will be unable to access Online
Programming/Monitoring again!
[F3] Index Across Files (SLC 5/02, 5/03, and 5/04 specific)
This option allows you to use indexed addressing to address data table elements outside
of the base address data file. Refer to Chapter 4 - Data Table Addressing and Editing
for more information.
Allow : The processor will not verify if the indexed address (the sum of the base
address and the offset value) is in the same data file as the base address. The processor
does check to ensure that the indexed address is contained within the data table address
space.
Disallow : The processor performs runtime checks on indexed addresses to ensure that
the indexed address is contained within the same data file as the base address. This is
the default selection.
SLC 5/03 OS301 and SLC 5/04 OS400 specific: When an indexed string (ST) data
file is specified, indexed addressing is not allowed to cross a string element boundary,
regardless of your index checking selection. A run–time error will occur if you use an
offset value that results in crossing a string element boundary.