Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 108)

Memory Organization
Chapter 7
7-2
Memory is divided into three major areas: data table, user program, and
message storage area. These areas store input status, output status, and
program instructions and messages.
Data Table
The first part of memory is the data table (Figure 7.1). The processors are
factory configured for 128 words. Figure 7.2 shows memory structure
with a factory configured data table. The specific concepts throughout this
publication refer to a factory configured data table.
Figure 7.1
Simplified Memory Structure
Data Table
Main Program
Subroutine
Message Storage Area
User Program
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Memory Areas