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
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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
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.

- 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.

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.

- 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) - -

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
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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
3.1Terms 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

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

– 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

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 .180
C.6.11 MENU.182
C.6.12 METHOD .185
C.6.13 PROGRAM .185
C.6.14 RECORDS.186
C.6.15 REFERENCE_ARRAY.186
C.6.16 Relations .187

– 6 – 61804-2 ” IEC:2004(E)
C.6.17 RESPONSE_CODES .188
C.6.18 VALUE_ARRAY .189
C.6.19 VARIABLE .189
C.6.20 VARIABLE_LIST .197
C.6.21 Common attributes.197
C.6.22 OPEN, CLOSE.199
C.6.23 Expression.199
C.6.24 C-Grammer.201
C.6.25 Redefinition .204
C.6.26 References .216
Annex D (normative) EDDL Builtin Library .218
D.1 General.218
D.2 Conventions for Builtin descriptions .218
D.3 Builtin abort.218
D.4 Builtin abort_on_all_comm_errors.219
D.5 Builtin ABORT_ON_ALL_COMM_STATUS .219
D.6 Builtin ABORT_ON_ALL_DEVICE_STATUS .220
D.7 Builtin ABORT_ON_ALL_RESPONSE_CODES .220
D.8 Builtin abort_on_all_response_codes .221
D.9 Builtin abort_on_comm_error .221
D.10 Builtin ABORT_ON_COMM_ERROR .222
D.11 Builtin ABORT_ON_COMM_STATUS.222
D.12 Builtin ABORT_ON_DEVICE_STATUS.223
D.13 Builtin ABORT_ON_NO_DEVICE .223
D.14 Builtin ABORT_ON_RESPONSE_CODE .224
D.15 Builtin abort_on_response_code .225
D.16 Builtin ACKNOWLEDGE .225
D.17 Builtin acknowledge.225
D.18 Builtin add_abort_method (version A) .226
D.19 Builtin add_abort_method (version B) .226
D.20 Builtin assign.227
D.21 Builtin assign_double.227
D.22 Builtin assign_float .228
D.23 Builtin assign_int .228
D.24 Builtin assign_var .228
D.25 Builtin atof.229
D.26 Builtin atoi.229
D.27 Builtin dassign.229
D.28 Builtin Date_to_DayOfMonth.230
D.29 Builtin Date_to_Month .230
D.30 Builtin Date_to_Year.231
D.31 Builtin DELAY .231
D.32 Builtin delay .231
D.33 Builtin DELAY_TIME.232

61804-2” IEC:2004(E) – 7 –
D.34 Builtin delayfor .232
D.35 Builtin DICT_ID .233
D.36 Builtin discard_on_exit.233
D.37 Builtin display.234
D.38 Builtin display_builtin_error.234
D.39 Builtin display_comm_error.234
D.40 Builtin display_comm_status.235
D.41 Builtin display_device_status .235
D.42 Builtin display_dynamics.236
D.43 Builtin display_message .236
D.44 Builtin display_response_code.237
D.45 Builtin display_response_status .238
D.46 Builtin display_xmtr_status .238
D.47 Builtin edit_device_value .238
D.48 Builtin edit_local_value .239
D.49 Builtin ext_send_command .240
D.50 Builtin ext_send_command_trans.240
D.51 Builtin fail_on_all_comm_errors .241
D.52 Builtin fail_on_all_response_codes .242
D.53 Builtin fail_on_comm_error .242
D.54 Builtin fail_on_response_code .243
D.55 Builtin fassign.243
D.56 Builtin fgetval .244
D.57 Builtin float_value.244
D.58 Builtin fsetval .244
D.59 Builtin ftoa.245
D.60 Builtin fvar_value.245
D.61 Builtin get_acknowledgement.245
D.62 Builtin get_comm_error.246
D.63 Builtin get_comm_error_string .247
D.64 Builtin get_date .247
D.65 Builtin get_date_value .247
D.66 Builtin get_dds_error .248
D.67 Builtin GET_DEV_VAR_VALUE .249
D.68 Builtin get_dev_var_value.249
D.69 Builtin get_dictionary_string.250
D.70 Builtin get_double.250
D.71 Builtin get_double_value.251
D.72 Builtin get_float .251
D.73 Builtin get_float_value .252
D.74 Builtin GET_LOCAL_VAR_VALUE .252
D.75 Builtin get_local_var_value .253
D.76 Builtin get_more_status .253

– 8 – 61804-2 ” IEC:2004(E)
D.77 Builtin get_resolve_status.254
D.78 Builtin get_response_code.254
D.79 Builtin get_response_code_string .255
D.80 Builtin get_signed.255
D.81 Builtin get_signed_value.256
D.82 Builtin get_status_code_string .256
D.83 Builtin get_status_string .257
D.84 Builtin get_stddict_string.257
D.85 Builtin get_string .258
D.86 Builtin get_string_value .259
D.87 Builtin GET_TICK_COUNT .259
D.88 Builtin get_unsigned .259
D.89 Builtin get_unsigned_value .260
D.90 Builtin iassign.260
D.91 Builtin igetval .261
D.92 Builtin IGNORE_ALL_COMM_STATUS .261
D.93 Builtin IGNORE_ALL_DEVICE_STATUS .262
D.94 Builtin IGNORE_ALL_RESPONSE_CODES .262
D.95 Builtin IGNORE_COMM_ERROR .263
D.96 Builtin IGNORE_COMM_STATUS .263
D.97 Builtin IGNORE_DEVICE_STATUS .264
D.98 Builtin IGNORE_NO_DEVICE .264
D.99 Builtin IGNORE_RESPONSE_CODE .265
D.100 Builtin int_value.265
D.101 Builtin is_NaN .266
D.102 Builtin isetval.266
D.103 Builtin ITEM_ID .266
D.104 Builtin itoa.267
D.105 Builtin ivar_value.267
D.106 Builtin lassign.
...