SIST EN 61804-2:2004

SLOVENSKI SIST EN 61804-2:2004

STANDARD
december 2004
Function Blocks (FB) for process control - Part 2: Specification of FB concept and
Electronic Device Description Language (EDDL)
ICS 25.040.40; 35.240.50 Referenčna številka
SIST EN 61804-2:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 61804-2
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2004

ICS 25.040.40;35.240.50


English version


Function Blocks (FB) for process control
Part 2: Specification of FB concept and
Electronic Device Description Language (EDDL)
(IEC 61804-2:2004)


Blocs-Fonctions (FB) pour la commande Funktionsbausteine
de processus für die Prozessautomation
Partie 2 : Spécification du concept de bloc Teil 2: Festlegung des
et du langage descriptif des dispositifs Funktionsbausteinskonzepts
électroniques (EDDL) und der Gerätebeschreibungssprache
(CEI 61804-2:2004) (EDDL)
(IEC 61804-2:2004)



This European Standard was approved by CENELEC on 2004-06-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61804-2:2004 E

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EN 61804-2:2004 - 2 -
Foreword
The text of document 65C/324/FDIS, future edition 1 of IEC 61804-2, prepared by SC 65C, Digital
communications, of IEC TC 65, Industrial-process measurement and control, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 61804-2 on 2004-06-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2005-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-06-01
Annex ZA has been added by CENELEC.
The International Electrotechnical Commission (IEC) and CENELEC draw attention to the fact that it is
claimed that compliance with this document may involve the use of patents
U.S. Patent No. 5,333,114
U.S. Patent No. 5,485,400
U.S. Patent No. 5,825,664
U.S. Patent No. 5,909,368
U.S. Patent Pending No. 08/916,178
Australian Patent No. 638507
Canadian Patent No. 2,066,743
European Patent No. 0495001
Validated in:
UK – Patent No. 0495001
France – Patent No. 0495001
Germany – Patent No. 69032954.7
Netherlands – Patent No. 0495001
Japan Patent No. 3137643
The IEC and CENELEC take no position concerning the evidence, validity and scope of this patent
right. The holder of this patent right has assured the IEC that he is willing to negotiate licenses under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this
respect, the statement of the holder of this patent right is registered with IEC. Information may be
obtained from:
Fieldbus Foundation,
9390 Research Boulevard, Suite II-250,
Austin, Texas, USA 78759,
Attention: President.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights other than those identified above. IEC and CENELEC shall not be held responsible for
identifying any or all such patent rights.

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- 3 - EN 61804-2:2004
Parts of this standard are derived from "Fieldbus Foundation Specification FF-890 rev. 1.5 ) (undated)"
and "Fieldbus Foundation Specification FF-900 rev. 1.4 (dated 1999-06-29)" and are used with
1)
permission of the Fieldbus Foundation.
Parts of this standard are derived from "HART Device Description Language Specification, rev. 11.0
August 5, 1996)" and "HART Device Description Language Method Builtins Library, rev. 10.1
2)
(August 5, 1996)" and are used with the permission of the HART Communication Foundation.
__________
Endorsement notice
The text of the International Standard IEC 61804-2:2004 was approved by CENELEC as a European
Standard without any modification.
__________

1)
For additional information on Fieldbus Foundation, please contact: The Fieldbus Foundation, 9390 Research Boulevard,
Austin, Texas 78759, USA. Tel: +1 512 794 8890. URL: www.fieldbusfoundation.org.)
2)
For additional information on HART Communication Foundation, please contact: HART Communication Foundation, 9390
Research Boulevard, Suite I-350, Austin, Texas 78759, USA. Tel: +1 512 794 0369. URL: www.hartcomm.org.

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EN 61804-2:2004 - 4 -
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60050-351 1998 International Electrotechnical Vocabulary- -
Part 351: Automatic control

1) 2)
IEC 60584-1 - Thermocouples EN 60584-1 1995
Part 1: Reference tables

IEC 61131-3 2003 Programmable controllers EN 61131-3 2003
Part 3: Programming languages

IEC 61158 Series Digital data communications for EN 61158 Series
measurement and control - Fieldbus for
use in industrial control systems

IEC/PAS 61499-1 2000 Function blocks for industrial-process - -
measurement and control systems
Part 1: Architecture

IEC/PAS 61499-2 2001 Part 2: Software tools requirements - -

IEC/TS 61804-1 2003 Function blocks (FB) for process control - -
Part 1: Overview of system aspects

ISO/IEC 2022 1994 Information technology - Character code - -
structure and extension techniques

ISO/IEC 2375 2003 Information technology - Procedure for - -
registration of escape sequences and
coded character sets

ISO/IEC 7498-1 1994 Information technology - Open systems - -
interconnection - Basic reference model
Part 1: The basic model

ISO/IEC 8859-1 1998 Information technology - 8-bit single-byte - -
coded graphic character sets
Part 1: Latin alphabet No.1

ISO/IEC 9899 1999 Programming languages - C - -


1)
Undated reference.
2)
Valid edition at date of issue.

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- 5 - EN 61804-2:2004
Publication Year Title EN/HD Year
ISO/IEC 10646-1 2000 Information technology - Universal - -
Multiple-Octet Coded Character Set
(UCS)
Part 1: Architecture and Basic Multilingual
Plane

IEEE 754 1985 Binary Floating-Point Arithmetic (R1990) - -

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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: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale XN
International Electrotechnical Commission
ɆɟɠɞɭɧɚɪɨɞɧɚɹɗɥɟɤɬɪɨɬɟɯɧɢɱɟɫɤɚɹɄɨɦɢɫɫɢɹ
For price, see current catalogue

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– 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
3.1Terms and definitions .27
3.2Abbreviated terms and acronyms .34
3.3Conventions for lexical structures .34
4 General Function Block (FB) definition and EDD model .36
4.1Device 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
4.2Block combinations.46
4.2.1 Measurement channel .46
4.2.2 Actuation channel .47
4.2.3 Application.48
4.3EDD 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
5.1General.51
5.2Application 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
5.3Component FBs.59
5.4Technology Block .59
5.4.1 Temperature Technology Block .59

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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
5.5Device (Resource) Block .68
5.5.1 Identification .68
5.5.2 Device state.69
5.5.3 Message.71
5.5.4 Initialization .71
5.6Algorithms 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
9.1Overview.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
9.2EDD identification information.82
9.2.1 General structure .82
9.2.2 Specific attributes .82
9.3BLOCK.84
9.3.1 BLOCK_A .84
9.3.2 BLOCK_B .88
9.4COLLECTION.90
9.4.1 General structure .90
9.4.2 Specific attributes - item-type .90
9.5COMMAND .91
9.5.1 General structure .91
9.5.2 Specific attributes .92
9.6CONNECTION .96
9.6.1 General structure .96
9.6.2 Specific attribute - APPINSTANCE .96
9.7DOMAIN.97
9.7.1 General structure .97
9.7.2 Specific attribute - HANDLING.97
9.8EDIT_DISPLAY .98
9.8.1 General structure .98
9.8.2 Specific attributes .98

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– 4 – 61804-2 ” IEC:2004(E)
9.9IMPORT .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 diagrams for actions .114
9.12 METHOD .118
9.12.1 General structure .118
9.12.2 Specific attributes .118
9.13 PROGRAM .119
9.13.1 General structure .119
9.13.2 Specific attributes - ARGUMENT .119
9.14 RECORD .120
9.15 REFERENCE_ARRAY.120
9.15.1 General structure .120
9.15.2 Specific attributes - ELEMENTS .121
9.16 Relations .121
9.16.1 General structure .121
9.16.2 REFRESH.121
9.16.3 UNIT.122
9.16.4 WRITE_AS_ONE .122
9.17 RESPONSE_CODES .122
9.18 VALUE_ARRAY .123
9.18.1 General structure .123
9.18.2 Specific attributes .123
9.19 VARIABLE .124
9.19.1 General structure .124
9.19.2 Specific attributes .125
9.20 VARIABLE_LIST .138
9.21 Common attributes.138
9.21.1 DEFINITION .138
9.21.2 HELP.139
9.21.3 LABEL .139
9.21.4 MEMBERS.139
9.21.5 RESPONSE_CODES .140
9.22 Output redirection (OPEN and CLOSE) .141
9.23 Conditional expression.141
9.24 Referencing .142
9.24.1 Referencing an EDD instance.142
9.24.2 Referencing members of a RECORD .142
9.24.3 Referencing elements of a VALUE_ARRAY .143
9.24.4 Referencing members of a COLLECTION .143
9.24.5 Referencing elements of a REFERENCE_ARRAY.144
9.24.6 Referencing members of a VARIABLE_LISTS.144
9.24.7 Referencing elements of BLOCK_A PARAMETERS .145
9.24.8 Referencing elements of BLOCK_A PARAMETER_LISTS .145
9.24.9 Referencing BLOCK_A CHARACTERISTICS .146

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61804-2” IEC:2004(E) – 5 –
9.25 Strings.146
9.25.1 Specifying a string as a string literal .146
9.25.2 Specifying a string as a string variable .146
9.25.3 Specifying a string as an enumeration value .146
9.25.4 Specifying a string as a dictionary reference.147
9.25.5 Referencing HELP and LABEL attributes of EDD instances.147
9.25.6 String operations.147
9.25.7 Prompt String Formats .148
9.26 Expression.148
9.26.2 Primary expressions.148
9.26.3 Unary expressions .150
9.26.4 Binary expressions.150
9.27 Text dictionary .153
10 Conformance statement.154
Annex A (informative) Parameter description .155
Annex B (normative) IEC 61804 Conformance Declaration.160
Annex C (normative) EDDL Formal Definition .161
C.1 EDDL Preprocessor.161
C.1.1 General structure .161
C.1.2 Directives .161
C.1.3 Predefined macros.164
C.1.4 NEWLINE characters .164
C.1.5 Comments .164
C.2 Conventions .164
C.2.1 Integer constants .164
C.2.2 Floating point constants .165
C.2.3 String literals .165
C.2.4 Using language codes in string constants .166
C.3 Operators.166
C.4 Keywords .167
C.5 Terminals .169
C.6 letter (letter|digit|_)*Formal EDDL syntax .169
C.6.1 General .169
C.6.2 EDD identification information .169
C.6.3 BLOCK_A and BLOCK_B .171
C.6.4 COLLECTION .173
C.6.5 COMMAND .173
C.6.6 CONNECTION .177
C.6.7 DOMAIN .177
C.6.8 EDIT_DISPLAY.178
C.6.9 IMPORT .179
C.6.10 LIKE .
...