Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manuel d'utilisateur télécharger pdf (Page 9)

Chapter 1

Program ladder diagram

Instruction

You organize ladder diagram as rungs on a ladder and put instructions on each

rung. There are two basic types of instructions:

• Input instruction: An instruction that checks, compares, or examines

specific conditions in your machine or process.

• Output instruction: An instruction that takes some action, such as turn on

a device, turn off a device, copy data, or calculate a value.

Branch

A branch is two or more instructions in parallel.

Introduction

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Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manuel d'utilisateur Page 9