Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Uživatelský manuál stáhnout pdf (Strana 30)

Chapter

41

Memory Organization

This chapter describes:

Hardware and its relationship to your program

Memory and its components

In chapter 2 we described in general terms the processor’s memory section.

Now we want to give you detailed concepts of the memory’s organization and

its structure. Understanding these concepts will aid you in programming your

processor.

Before we explain memory organization and its structure, there are some

vocabulary definitions that will clarify this chapter:

Bit: the smallest unit of information that memory is capable of retaining.

Byte: a group of 8 bits.

Word: a group of 16 bits.

Hardware

vs. Y

our Program

The chart below and Figure 4.1 represent how the hardware of your system

relates to the input and output image tables. Understanding these two

illustrations will further your programming abilities.

Objectives

Introduction

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Uživatelský manuál Strana 30