Standard PID control

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An example of PID control with PLCs

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Preface, Contents

SIMATIC Standard PID Control

Function Blocks Standard PID Control Product Overview Standard PID Control Designing Digital Controllers Configuring and Starting the Standard PID Control

1 2 3 4 5 6 7 8 9

Manual

Signal Processing in the Setpoint/ Process Variable Channels and PID Controller Functions The Continous Controller (PID_CP) The Step Controller (PID_ES) The Loop Scheduler and Examples of Controller Configurations Technical Data and Block Diagrams Parameter Lists of the Standard PID Control Configuration Standard PID Control Configuration Software for Standard PID Control Appendices Literature List Glossary, Index

10

A

This manual is part of the documentation package with the order number 6ES7830-2AA21-8BG0

Edition 03/2003A5E00204510-02

Safety GuidelinesThis manual contains notices intended to ensure personal safety, as well as to protect the products and connected equipment against damage. These notices are highlighted by the symbols shown below and graded according to severity by the following texts:

! ! !

Dangerindicates that death, severe personal injury or substantial property damage will result if proper precautions are not taken.

Warningindicates that death, severe personal injury or substantial property damage can result if proper precautions are not taken.

Cautionindicates that minor personal injury can result if proper precautions are not taken.

Cautionindicates that property damage can result if proper precautions are not taken.

Noticedraws your attention to particularly important information on the product, handling the product, or to a particular part of the documentation.

Qualified PersonnelOnly qualified personnel should be allowed to install and work on this equipment. Qualified persons are defined as persons who are authorized to commission, to ground and to tag circuits, equipment, and systems in accordance with established safety practices and standards.

Correct UsageNote the following:

!

WarningThis device and its components may only be used for the applications described in the catalog or the technical description, and only in connection with devices or components from other manufacturers which have been approved or recommended by Siemens. This product can only function correctly and safely if it is transported, stored, set up, and installed correctly, and operated and maintained as recommended.

TrademarksSIMATIC, SIMATIC HMI and SIMATIC NET are registered trademarks of SIEMENS AG. Third parties using for their own purposes any other names in this document which refer to trademarks might infringe upon the rights of the trademark owners. Copyright W Siemens AG 2002 2003 All rights reserved Disclaim of Liability The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility model or design, are reserved. Siemens AG Bereich Automation and Drives Geschaeftsgebiet Industrial Automation Systems Postfach 4848, D- 90327 Nuernberg We have checked the contents of this manual for agreement with the hardware and software described. Since deviations cannot be precluded entirely, we cannot guarantee full agreement. However, the data in this manual are reviewed regularly and any necessary corrections included in subsequent editions. Suggestions for improvement are welcomed. Siemens AG 2003 Technical data subject to change. A5E00204510-02

Index-2 Siemens Aktiengesellschaft

Standard PID Control A5E00204510-02

Preface

Purpose of the ManualThis manual will help you when selecting, configuring, and assigning parameters to a controller block for your control task. The manual introduces you to the functions of the configuration tool and explains how you use it.

Required Basic KnowledgeTo understand this manual, you should be familiar with automation and process control engineering. In addition, you should know how to use computers or devices with similar functions (e.g programming devices) under Windows 95/98/2000 or NT operating systems. Since Standard PID Control is based on the STEP 7 software, you should also know how to operate it. This is provided in the manual Programming with STEP 7 V5.1.

Where is this Manual valid?This manual is valid for the software packages Standard PID Control V5.1 and Standard PID Control Tool V5.1.

Standard PID Control A5E00204510-02

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Preface

Place of this Documentation in the Information EnvironmentStandard PID Control

Function Blocks

Configuration

Manual

The Standard PID Control software product includes three separate products: The product Standard PID Controller FB consists essentially of the two controller blocks PID_CP and PID_ES. The product Standard PID Control Tool consists essentially of the tools for configuring the controller blocks. This product is referred to simply as configuration tool in this manual. This manual is a separate product and describes both the product Standard PID Control FB and the configuration tool Standard PID Control Tool.

The Standard PID Control Software PackageThe Standard PID Control software package provides a comprehensive concept for implementing control functions in the SIMATIC S7 programmable logic controllers. The controller is completely programmed with its full range of functions and features for signal processing. To adapt a controller to your process, you simply select the subfunctions you require from the complete range of functions. The time and effort required for configuration is therefore reduced to omitting functions you do not require. In all these tasks, you are supported by the configuration tool. Since configuration is restricted to selecting or, in some cases, extending basic functions, the concept of the Standard PID Control is easy to learn. Even users with only limited knowledge of control systems will create high-quality controls.

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Preface

Finding Your Way Chapter 1 provides you with an overview of the Standard PID Control. Chapter 2 explains the structure and the functions of the Standard PID Control. Chapters 3 helps you to design and start up a Standard PID Control. Chapters 4 explains the signal processing in the setpoint/process-variable channel and in the controller. Chapters 5 explains the signal processing in the continuous controller output. Chapters 6 explains the signal processing in the step controller output. Chapters 7 shows you how to work with the loop scheduler and introduces examples of controller structures. Chapters 8 contains technical data and block diagrams. Chapters 9 contains parameter lists for the Standard PID Control. Chapters 10 provides you with an overview of the configuration tool. Appendices A contains the literature list. Important terms are explained in the glossary. The index helps you to access areas containing keywords easily and fast.

AudienceThis manual is intended for the following readers: S7 programmers programmers of control systems operators service personnel

Standard PID Control A5E00204510-02

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Preface

Conventions in the TextTo make it easier for you to find information in the manual, certain conventions have been used: First glance through the titles in the left margin to get an idea of the content of a section. Sections dealing with a specific topic either answer a question about the functions of the tool or provide information about necessary or recommended courses of action. References to further information dealing with a topic are indicated by (see Chapter x.y). References to other manuals and documentation are indicated by numbers in slashes /.../. These numbers refer to the titles of manuals listed in the Appendix. Instructions for you to follow are marked by a black dot. Sequences of activities are numbered or explained as explicit steps. Alternative courses of action or decisions you need to take are indicated by a dash.

Further InformationThis manual is intended as a reference work that provides you with the information you will require to work with the standard controller. You do, however, require a broader scope of information that is available in the following manuals: /70/, /71/, /100/, /101/, /231/, /232/, /234/, /352/.

Further SupportIf you have any technical questions, please get in touch with your Siemens representative or agent responsible. http://www.siemens.com/automation/partner

Training CentersSiemens offers a number of training courses to familiarize you with the SIMATIC S7 automation system. Please contact your regional training center or our central training center in D 90327 Nuremberg, Germany for details: Telephone: Internet: +49 (911) 895-3200. http://www.sitrain.com

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Preface

A&D Technical SupportWorldwide, available 24 hours a day:

Nuernberg Johnson City Beijing

Technical Support Worldwide (Nuernberg) Technical Support24 hours a day, 365 days a year Phone: Fax: E-Mail: GMT: +49 (0) 180 5050-222 +49 (0) 180 5050-223 adsupport@ siemens.com +1:00

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