Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 107)

Chapter
7
7-1
Memory Organization
This chapter discusses:
hardware and its relationship to your program
memory and its components
This chapter provides detailed concepts of the memory’s organization and
its structure. Understanding these concepts aids you in programming
your processor.
Before we explain memory organization and its structure, read the
following definitions:
Bit - the smallest unit of information that memory is capable of retaining
Byte - a group of 8 consecutive bits (00-07
08
or 10-17
08
)
Word - a group of 16 consecutive bits (00-17
08
)
10346-I
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Byte
(upper)
Byte
(lower)
Word
Bits
In the program, the input or output instruction address is associated with a
specific I/O terminal. See chapter 5 for more information.
Chapter Objectives
Introduction