Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 67)

Configuring the SLC 500 CPU and I/O Modules
3-11
Load Memory Module Always (S:1/11)
(Not available on MicroLogix)
This bit controls the way the processor starts up.
If this bit is set when the processor starts up, the contents of the memory module will be
copied to the processor.
If the processor was in run mode or faulted from run mode when the power went down,
the processor will go into run mode.
If the processor was in test or program mode, or faulted from test or program mode,
when the power went down, the processor will go into program mode.
This bit is 0 by default.
!
If this bit is set, the memory module will overwrite the processor memory on
powerup.
Load Memory Module and Run (S:1/12)
(This function is not available on MicroLogix controllers; S:1/12 is the Run Always bit.
For more information refer to Appendix A - Programming Reference for Packaged
Controllers in the Instruction Set Reference .)
This bit controls the way the processor starts up.
If this bit is set when the processor starts up, the contents of the memory module will be
copied to the processor, and the processor will go into run mode, regardless of the state
it was in when the power went down. Otherwise, the processor will retain it's memory
and state as it was when power was lost.
This bit is 0 by default.
!
If this bit is set, the memory module will overwrite the processor memory on
powerup.