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1772-6.8.6, 4 - memory organization – Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 User Manual

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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