IEC 61804-2:2004

Function blocks (FB) for process control - Part 2: Specification of FB concept and Electronic Device Description Language (EDDL)

is applicable to Function Blocks (FB) for process control and specifies the Electronic Device Description Language (EDDL), specifies FB by using the result of harmonization work as regards several elements. defines a subset of the requirements of IEC 61804-1 (hereafter referred to as Part 1) only, while Part 1 describes requirements for a distributed system.

General Information

• Status: Replaced
• Publication Date: 13-May-2004
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.240.50 - IT applications in industry
• Technical Committee: SC 65E - Devices and integration in enterprise systems
• Drafting Committee: WG 7 - TC 65/SC 65E/WG 7
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 12-Sep-2006

Relations

• Replaces: IEC PAS 61804-2:2002 - Function blocks (FB) for process control - Part 2: Specification of FB concept and Electronic Device Description Language (EDDL)
• Effective Date: 05-Sep-2023
• Replaced By: IEC 61804-3:2006 - Function blocks (FB) for process control - Part 3: Electronic Device Description Language (EDDL)
• Effective Date: 05-Sep-2023
• Revised: IEC 61804-2:2006 - Function blocks (FB) for process control - Part 2: Specification of FB concept
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 61804-2
First edition
2004-05
Function blocks (FB) for process control –
Part 2:
Specification of FB concept and Electronic
Device Description Language (EDDL)

Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the

60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

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edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the

base publication incorporating amendment 1 and the base publication incorporating

amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD 61804-2
First edition
2004-05
Function blocks (FB) for process control –
Part 2:
Specification of FB concept and Electronic
Device Description Language (EDDL)

© IEC 2004 – Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XH
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61804-2 © IEC:2004(E)
CONTENTS
FOREWORD.22

INTRODUCTION.24

1 Scope .25

2 Normative references .26

3 Terms and definitions, abbreviated terms and acronyms, and conventions for
lexical structures .27

3.1 Terms and definitions .27

3.2 Abbreviated terms and acronyms .34
3.3 Conventions for lexical structures .34
4 General Function Block (FB) definition and EDD model .36
4.1 Device structure (device model).36
4.1.1 Device model description .36
4.1.2 FB type.40
4.1.3 FB execution.41
4.1.4 Reference between IEC/PAS 61499-1, IEC/PAS 61499-2 and IEC
61804 models .42
4.1.5 UML specification of the device model.42
4.1.6 Classification of the algorithms.44
4.1.7 Algorithm description .45
4.1.8 Input and output variables and parameter definition .45
4.1.9 Choice of variables and parameters.46
4.1.10 Mode, Status and Diagnosis.46
4.2 Block combinations.46
4.2.1 Measurement channel .46
4.2.2 Actuation channel .47
4.2.3 Application.48
4.3 EDD and EDDL model .49
4.3.1 Overview of EDD and EDDL .49
4.3.2 EDD architecture .49
4.3.3 Concepts of EDD .49
4.3.4 Principles of the EDD development process.49
4.3.5 Interrelations between the lexical structure and formal definitions .50
4.3.6 Builtins .51

4.3.7 Profiles .51
5 Detailed block definition.51
5.1 General.51
5.2 Application FBs .51
5.2.1 Analog Input FB .51
5.2.2 Analog Output FB .53
5.2.3 Discrete Input FB .54
5.2.4 On/Off Actuation (Output) FB Discrete Output FB .56
5.2.5 Calculation FB .57
5.2.6 Control FB .58
5.3 Component FBs.59
5.4 Technology Block .59
5.4.1 Temperature Technology Block .59

61804-2 © IEC:2004(E) – 3 –
5.4.2 Pressure Technology Block .62

5.4.3 Modulating Actuation Technology Block.64

5.4.4 On/Off Actuation Technology Block .66

5.5 Device (Resource) Block .68

5.5.1 Identification .68

5.5.2 Device state.69

5.5.3 Message.71

5.5.4 Initialization .71

5.6 Algorithms common to all blocks .71

5.6.1 Data Input/Data Output status .71

5.6.2 Validity .71
5.6.3 Restart Initialization .71
5.6.4 Fail-safe .72
5.6.5 Remote Cascade Initialization .72
6 FB Environment.73
7 Mapping to System Management .73
8 Mapping to Communication.73
9 Electronic Device Description Language .75
9.1 Overview.75
9.1.1 EDDL features .75
9.1.2 Syntax representation .75
9.1.3 EDD language elements.75
9.1.4 Basic construction elements .75
9.1.5 Common attributes.81
9.1.6 Special elements .81
9.1.7 Rules for instances .81
9.1.8 Rules for list of VARIABLEs .81
9.2 EDD identification information.82
9.2.1 General structure .82
9.2.2 Specific attributes .82
9.3 BLOCK.84
9.3.1 BLOCK_A .84
9.3.2 BLOCK_B .88
9.4 COLLECTION.90
9.4.1 General structure .90
9.4.2 Specific attributes - item-type .90
9.5 COMMAND .91
9.5.1 General structure .91
9.5.2 Specific attributes .92
9.6 CONNECTION .96
9.6.1 General structure .96
9.6.2 Specific attribute - APPINSTANCE .96
9.7 DOMAIN.97
9.7.1 General structure .97
9.7.2 Specific attribute - HANDLING.97
9.8 EDIT_DISPLAY .98
9.8.1 General structure .98
9.8.2 Specific attributes .98

– 4 – 61804-2 © IEC:2004(E)
9.9 IMPORT .100

9.9.1 General structure .100

9.9.2 Specific attributes – attribute-redefinition.102

9.10 LIKE .108

9.11 MENU.108

9.11.1 General structure .108

9.11.2 Specific attributes .109

9.11.3 Sequence diag
...