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Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual User Manual

Page 7

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v

Publication 1757-UM006A-EN-P - May 2002

Table of Contents

Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . . ii

Preface

About this Document

Contents guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2
Rockwell Automation Technical Support . . . . . . . . . . . . . . P-3

Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . P-3
Obtain Technical Product Support . . . . . . . . . . . . . . . . P-3
Your Questions or Comments about This Manual . . . . . P-3

Chapter 1

The Fieldbus Communication
Model

Fieldbus Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

About the Fieldbus Foundation. . . . . . . . . . . . . . . . . . . 1-1
Want more information? . . . . . . . . . . . . . . . . . . . . . . . . 1-1
What is Fieldbus? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Open Communications Architecture . . . . . . . . . . . . . . . 1-3
Communication Layer Description . . . . . . . . . . . . . . . . 1-4

Standard Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

About Modes of Operation . . . . . . . . . . . . . . . . . . . . . . 1-8
Analog Input Block . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Analog Output Block . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Bias/Gain Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Control Selector Block . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Discrete Input Block . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Discrete Output Block . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Manual Loader Block . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Proportional/Derivative Block . . . . . . . . . . . . . . . . . . . 1-21
Proportional/Integral/Derivative Block . . . . . . . . . . . . . 1-23
Ratio Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

Device Descriptions and Block Parameters. . . . . . . . . . . . . 1-27

About Device Descriptions . . . . . . . . . . . . . . . . . . . . . . 1-27
Device Description Language . . . . . . . . . . . . . . . . . . . . 1-27
Device Description infrastructure . . . . . . . . . . . . . . . . . 1-28

Foundation Fieldbus Performance . . . . . . . . . . . . . . . . . . . 1-29

Performance Calculation Considerations . . . . . . . . . . . . 1-29