Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 39)

Chapter
4
4Ć1
Memory Organization
In this chapter, you will read about:
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
)
Hardware and Your Program
Figure 4.1 and the following chart represents how the hardware of your
processor relates to the input and output image tables. Understanding the two
figures help you understand programming.
Chapter Objectives
Introduction