EN 61158-6-3:2012

SLOVENSKI STANDARD
01-september-2012
1DGRPHãþD
SIST EN 61158-6-3:2008
Industrijska komunikacijska omrežja - Specifikacije za procesno vodilo - 6-3. del:
Specifikacija protokola na aplikacijskem nivoju - Elementi tipa 3 (IEC 61158-6-
3:2010)
Industrial communication networks - Fieldbus specifications - Part 6-3: Application layer
protocol specification - Type 3 elements (IEC 61158-6-3:2010)
Industrielle Kommunikationsnetze - Feldbusse - Teil 6-3: Protokollspezifikation des
Application Layer (Anwendungsschicht) - Typ 3-Elemente (IEC 61158-6-3:2010)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 6-3:
Spécification des protocoles des couches d'application - Eléments de type 3 (CEI 61158-
6-3:2010)
Ta slovenski standard je istoveten z: EN 61158-6-3:2012
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.70 Uporabniški sloj Application layer
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61158-6-3
NORME EUROPÉENNE
June 2012
EUROPÄISCHE NORM
ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-6-3:2008

English version
Industrial communication networks -
Fieldbus specifications -
Part 6-3: Application layer protocol specification -
Type 3 elements
(IEC 61158-6-3:2010)
Réseaux de communication industriels -  Industrielle Kommunikationsnetze -
Spécifications des bus de terrain - Feldbusse -
Partie 6-3: Spécification des protocoles Teil 6-3: Protokollspezifikation des
des couches d'application - Application Layer (Anwendungsschicht) -
Eléments de type 3 Typ 3-Elemente
(CEI 61158-6-3:2010) (IEC 61158-6-3:2010)

This European Standard was approved by CENELEC on 2012-03-28. 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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions.

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

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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61158-6-3:2012 E
Foreword
The text of document 65C/607/FDIS, future edition 2 of IEC 61158-6-3, prepared by SC 65C, "Industrial
networks", of IEC/TC 65, "Industrial-process measurement, control and automation" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN 61158-6-3:2012.

The following dates are fixed:
(dop) 2012-12-28
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2015-03-28

standards conflicting with the
document have to be withdrawn
This document supersedes EN 61158-6-3:2008.
3:2008:
– corrections, in Table 10 and Table 48;
– clarification in 6.9.1.2;
– expired patents deleted and new patents disclosed.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 61158-6-3:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC/TR 61158-1:2010 NOTE  Harmonized as CLC/TR 61158-1:2010 (not modified).

- 3 - EN 61158-6-3:2012
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60559 - Binary floating-point arithmetic for HD 592 S1 -
microprocessor systems
IEC 61158-3-3 2007 Industrial communication networks - EN 61158-3-3 2008
Fieldbus specifications -
Part 3-3: Data-link layer service definition -
Type 3 elements
IEC 61158-4-3 2010 Industrial communication networks - EN 61158-4-3 2012
Fieldbus specifications -
Part 4-3: Data-link layer protocol specification
- Type 3 elements
IEC 61158-5-3 2010 Industrial communication networks - EN 61158-5-3 2012
Fieldbus specifications -
Part 5-3: Application layer service definition -
Type 3 elements
IEC 61158-6-10 2010 Industrial communication networks - EN 61158-6-10 2012
Fieldbus specifications -
Part 6-10: Application layer protocol
specification - Type 10 elements

ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
ISO/IEC 8822 - Information technology - Open Systems - -
Interconnection - Presentation service
definition
ISO/IEC 8824-1 - Information technology - Abstract Syntax - -
Notation One (ASN.1): Specification of basic
notation
ISO/IEC 9545 - Information technology - Open Systems - -
Interconnection - Application Layer structure

ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic reference model -
Conventions for the definition of OSI services

IEC 61158-6-3 ®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-3: Application layer protocol specification – Type 3 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XN
ICS 25.04.40; 35.100.70; 35.110 ISBN 978-2-88912-126-7
– 2 – 61158-6-3 © IEC:2010(E)
CONTENTS
FOREWORD.8
INTRODUCTION.10
1 Scope.12
1.1 General .12
1.2 Specifications .13
1.3 Conformance.13
2 Normative references.13
3 Terms, definitions, abbreviations, symbols and conventions .14
3.1 Referenced terms and definitions.14
3.2 Additional definitions.15
3.3 Abbreviations and symbols .18
3.4 Conventions .19
3.5 Conventions used in state machines .21
4 FAL syntax description.24
4.1 APDU abstract syntax.24
4.2 Data types .28
5 Transfer syntax.30
5.1 Coding of basic data types.30
5.2 Coding section related to data exchange PDUs .33
5.3 Coding section related to slave diagnosis PDUs .33
5.4 Coding section related to parameterisation PDU .44
5.5 Coding section related to configurationPDUs.50
5.6 Coding section related to global control PDUs.54
5.7 Coding section related to clock-value-PDUs .55
5.8 Coding section related to function identification and errors .56
5.9 Coding section related to master diagnosis PDU .60
5.10 Coding section related to upload/download/act para PDUs .62
5.11 Coding section related to the bus parameter set.64
5.12 Coding section related to the slave parameter set .66
5.13 Coding section related to statistic counters .70
5.14 Coding section related to set slave address PDU .70
5.15 Coding section related to initiate/abort PDUs .70
5.16 Coding section related to read/write/data transport PDUs .74
5.17 Coding section related to load region and function invocation PDUs .74
5.18 Examples of diagnosis-RES-PDUs.77
5.19 Example of Chk_Cfg-REQ-PDU .79
5.20 Examples of Chk_Cfg-REQ-PDUs with DPV1 data types .80
5.21 Example structure of the Data_Unit for Data_Exchange .81
6 FAL protocol state machines.83
6.1 Overall structure .83
6.2 Assignment of state machines to devices.84
6.3 Overview DP-slave .85
6.4 Overview DP-master (class 1).87
6.5 Overview DP-master (class 2).88
6.6 Cyclic communication between DP-master (class 1) and DP-slave .89
6.7 Acyclic communication between DP-master (class 2) and DP-master (class 1) .90

61158-6-3 © IEC:2010(E) – 3 –
6.8 Acyclic communication between DP-master (class 1) and DP-slave.92
6.9 Application relationship monitoring.94
7 AP-context state machine . 100
8 FAL service protocol machines (FSPMs) . 100
8.1 FSPMS.100
8.2 FSPMM1 .136
8.3 FSPMM2 .172
9 Application relationship protocol machines (ARPMs) . 190
9.1 MSCY1S.190
9.2 MSAC1S. 221
9.3 SSCY1S . 234
9.4 MSRM2S . 237
9.5 MSAC2S. 243
9.6 MSCS1S. 260
9.7 MSCY1M .262
9.8 MSAL1M.282
9.9 MSAC1M .291
9.10 MMAC1 .304
9.11 MSCS1M .311
9.12 MSAC2M .316
9.13 MMAC2 .331
10 DLL mapping protocol machines (DMPMs) . 338
10.1 DMPMS.338
10.2 DMPMM1 .351
10.3 DMPMM2 .367
11 Parameters for a DP-slave. 375
Bibliography . 376

Figure 1 – Common structure of specific fields .20
Figure 2 – Coding of the data type BinaryDate .31
Figure 3 – Encoding of TimeOfDay value.31
Figure 4 – Encoding of Time Difference value.32
Figure 5 – Encoding of Network Time value.32
Figure 6 – Encoding of Network Time Difference value .33
Figure 7 – Example Modul_Status_Array .38
Figure 8 – Example of Ext_Diag_Data in case of DPV1 diagnosis format with alarm and
status PDU .78
Figure 9 – Example of Ext_Diag_Data in case of the basic diagnosis format .79
Figure 10 – Example of a special identifier format.79
Figure 11 – Example of a special identifier format with data types.80
Figure 12 – Example of a special identifier format with data types.80
Figure 13 – Example of a empty slot with data types.81
Figure 14 – Example for multi-variable device with AI and DO function blocks.81
Figure 15 – Identifiers (ID) .82
Figure 16 – Identifier list.82
Figure 17 – Structure of the Data_Unit for the request- and response-DLPDU.82

– 4 – 61158-6-3 © IEC:2010(E)
Figure 18 – Structuring of the protocol machines and adjacent layers in a DP-slave.86
Figure 19 – Structuring of the protocol machines and adjacent layers in a DP-master
(class 1).87
Figure 20 – Structuring of the protocol machines and adjacent layers in a DP-master
(class 2).
Figure 21 – Sequence of the communication between DP-master and DP-slave.90
Figure 22 – Sequence of communication between DP-master (class 2) and DP-master
(class 1).92
Figure 23 – Sequence of acyclic communication between DP-master (class 1) and DP-
slave.94
Figure 24 – Example for connection establishment on MS2.97
Figure 25 – Idle at master-side on MS2 .98
Figure 26 – Idle at slave-side on MS2.99
Figure 27 – Example for connection establishment on MS2(server-side) . 239
Figure 28 – Structure of RM entries in the RM_Registry. 240

Table 1 – State machine description elements .21
Table 2 – Description of state machine elements .22
Table 3 – Conventions used in state machines .22
Table 4 – APDU syntax .24
Table 5 – Substitutions.27
Table 6 – Alarm_Type range .36
Table 7 – Status_Type value range .36
Table 8 – Alarm_Specifier .37
Table 9 – Range of Modul_Status_Entry (1-4).39
Table 10 – Error type .41
Table 11 – Specification of the bits Lock_Req and Unlock_Req .44
Table 12 – Range of Length_of_Manufacturer_Specific_Data if used in Chk_Cfg-REQ-PDU .51
Table 13 – Range of Length_of_Manufacturer_Specific_Data if used in Get_Cfg-RES-PDU .51
Table 14 – Values (codes) for data types.53
Table 15 – Specification of the bits for Un-/Sync and Un-/Freeze .54
Table 16 – Coding of the Function_Code/ Function_Num.57
Table 17 – Coding of the Error_Code / Function_Num .58
Table 18 – Values of Error_Decode .58
Table 19 – Coding of Error_Code_1 at DPV1.59
Table 20 – Values of MDiag_Identifier .60
Table 21 – Values for Area_Code_UpDownload.62
Table 22 – Values for Area_CodeActBrct.63
Table 23 – Values for Area_CodeAct.63
Table 24 – Values for Data_rate .64
Table 25 – Values for Slave_Type .67
Table 26 – Values for Alarm_Mode.68
Table 27 – Values for Subnet .73
Table 28 – Values of reason code if instance is DLL .73

61158-6-3 © IEC:2010(E) – 5 –
Table 29 – Values of reason code if instance is MS2 .73
Table 30 – Values of Extended_Function_Num.74
Table 31 – Values of FI_State .76
Table 32 – Assignment of state machines.85
Table 33 – Primitives issued by AP-Context to FSPMS . 100
Table 34 – Primitives issued by FSPMS to AP-Context . 102
Table 35 – FSPMS state table .110
Table 36 – Functions used by the FSPMS . 135
Table 37 – Primitives issued by AP-Context to FSPMM1. 137
Table 38 – Primitives issued by FSPMM1 to AP-Context. 139
Table 39 – FSPMM1 state table.146
Table 40 – Functions used by the FSPMM1 . 172
Table 41 – Primitives issued by AP-Context to FSPMM2. 173
Table 42 – Primitives issued by FSPMM2 to AP-Context. 175
Table 43 – FSPMM2 state table.178
Table 44 – Functions used by the FSPMM2 . 189
Table 45 – Primitives issued by FSPMS to MSCY1S . 190
Table 46 – Primitives issued by MSCY1S to FSPMS .191
Table 47 – Rules for DPV1_Status_1, DPV1_Status_2 and DPV1_Status_3 check. 193
Table 48 – MSCY1S state table.198
Table 49 – Functions used by the MSCY1S . 219
Table 50 – Primitives issued by FSPMS to MSAC1S . 221
Table 51 – Primitives issued by MSAC1S to FSPMS . 222
Table 52 – Primitives issued by MSCY1S to MSAC1S. 222
Table 53 – Primitives issued by MSAC1S to MSCY1S. 222
Table 54 – Parameter used with primitives exchanged between MSAC1S and MSCY1S. 222
Table 55 – MSAC1S state table.224
Table 56 – Functions used by the MSAC1S . 234
Table 57 – Primitives issued by FSPMS to SSCY1S. 234
Table 58 – Primitives issued by SSCY1S to FSPMS. 234
Table 59 – SSCY1S state table .236
Table 60 – Functions used by the SSCY1S. 237
Table 61 – Primitives issued by FSPMS to MSRM2S . 238
Table 62 – Primitives issued by MSRM2S to FSPMS . 238
Table 63 – MSRM2S state table .241
Table 64 – Primitives issued by FSPMS to MSAC2S . 244
Table 65 – Primitives issued by MSAC2S to FSPMS . 245
Table 66 – Primitives issued by MSRM2S to MSAC2S . 245
Table 67 – Primitives issued by MSAC2S to MSRM2S . 246
Table 68 – Parameter used with primitives exchanged with MSAC2S . 246
Table 69 – MSAC2S state table.249
Table 70 – Primitives issued by MSCS1S to FSPMS . 260
Table 71 – MSCS1S state table.262

– 6 – 61158-6-3 © IEC:2010(E)
Table 72 – Primitives issued by FSPMM1 to MSCY1M . 263
Table 73 – Primitives issued by MSCY1M to FSPMM1 . 264
Table 74 – Parameters used with primitives exchanged between FSPMM1 and MSCY1M . 264
Table 75 – MSCY1M state table .267
Table 76 – Primitives issued by FSPMM1 to MSAL1M. 282
Table 77 – Primitives issued by MSAL1M to FSPMM1. 282
Table 78 – Primitives issued by MSCY1M to MSAL1M . 282
Table 79 – Primitives issued by MSAL1M to MSCY1M . 283
Table 80 – Parameter used with primitives exchanged between MSAL1M and MSCY1M . 283
Table 81 – Possible values in the Alarm_State_Table . 284
Table 82 – MSAL1M state table.287
Table 83 – Primitives issued by FSPMM1 to MSAC1M . 292
Table 84 – Primitives issued by MSAC1M to FSPMM1 . 292
Table 85 – Primitives issued by MSAL1M to MSAC1M . 293
Table 86 – Primitives issued by MSAC1M to MSAL1M . 293
Table 87 – Parameter used with primitives exchanged between MSAL1M and MSCY1M . 293
Table 88 – MSAC1M state table .299
Table 89 – Primitives issued by FSPMM1 to MMAC1 . 305
Table 90 – Primitives issued by MMAC1 to FSPMM1 . 305
Table 91 – MMAC1 state table.307
Table 92 – Primitives issued by FSPMM1 to MSCS1M . 312
Table 93 – Primitives issued by MSCS1M to FSPMM1 . 312
Table 94 – MSCS1M state table .314
Table 95 – Primitives issued by FSPMM2 to MSAC2M . 316
Table 96 – Primitives issued by MSAC2M to FSPMM2 . 317
Table 97 – Parameters used with primitives exchanged with MSAC2M. 317
Table 98 – MSAC2M state table .321
Table 99 – Primitives issued by FSPMM2 to MMAC2 . 331
Table 100 – Primitives issued by MMAC2 to FSPMM2 . 332
Table 101 – Parameters used with primitives exchanged with MMAC2 . 332
Table 102 – MMAC2 state table.333
Table 103 – Primitives issued by FSPMS to DMPMS . 338
Table 104 – Primitives issued by DMPMS to FSPMS . 338
Table 105 – Primitives issued by MSCY1S to DMPMS . 339
Table 106 – Primitives issued by DMPMS to MSCY1S . 339
Table 107 – Primitives issued by DMPMS to SSCY1S. 340
Table 108 – Primitives issued by MSAC1S, MSRM2S, MSAC2S to DMPMS . 340
Table 109 – Primitives issued by DMPMS to MSAC1S, MSRM2S, MSAC2S . 340
Table 110 – Primitives issued by DMPMS to MSCS1S . 341
Table 111 – Primitives issued by DMPMS to DL. 341
Table 112 – Primitives issued by DL to DMPMS.342
Table 113 – Parameters used with primitives exchanged with DMPMS. 343
Table 114 – DMPMS state table .344

61158-6-3 © IEC:2010(E) – 7 –
Table 115 – Functions used by the DMPMS. 350
Table 116 – Primitives issued by FSPMM1 to DMPMM1. 351
Table 117 – Primitives issued by DMPMM1 to FSPMM1. 352
Table 118 – Primitives issued by MSCY1M to DMPMM1 . 352
Table 119 – Primitives issued by DMPMM1 to MSCY1M . 353
Table 120 – Primitives issued by MSAL1M, MSAC1M to DMPMM1 . 353
Table 121 – Primitives issued by DMPMM1 to MSAL1M, MSAC1M . 353
Table 122 – Primitives issued by MMAC1 to DMPMM1 . 354
Table 123 – Primitives issued by DMPMM1 to MMAC1 . 354
Table 124 – Primitives issued by MSCS1M to DMPMM1 . 354
Table 125 – Primitives issued by DMPMM1 to MSCS1M . 355
Table 126 – Primitives issued by DMPMM1 to DL .355
Table 127 – Primitives issued by DL to DMPMM1 . 356
Table 128 – Parameters used with primitives exchanged with DMPMM1 . 357
Table 129 – Possible values of status. 358
Table 130 – DMPMM1 state table.359
Table 131 – Functions used by the DMPMM1 . 367
Table 132 – Primitives issued by FSPMM2 to DMPMM2. 368
Table 133 – Primitives issued by DMPMM2 to FSPMM2. 368
Table 134 – Primitives issued by MSAC2M to DMPMM2 . 369
Table 135 – Primitives issued by DMPMM2 to MSAC2M . 369
Table 136 – Primitives issued by MMAC2 to DMPMM2 . 369
Table 137 – Primitives issued by DMPMM2 to MMAC2 . 369
Table 138 – Primitives issued by DMPMM2 to DL .370
Table 139 – Primitives issued by DL to DMPMM2 . 370
Table 140 – Parameters used with primitives exchanged with DMPMM2 . 371
Table 141 – DMPMM2 state Table.371
Table 142 – Functions used by DMPMM2 . 375
Table 143 – Bus parameter/reaction times for a DP-slave. 375

– 8 – 61158-6-3 © IEC:2010(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 6-3: Application layer protocol specification –
Type 3 elements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
NOTE 1 Use of some of the associated protocol types is restricted by their intellectual-property-right holders. In all
cases, the commitment to limited release of intellectual-property-rights made by the holders of those rights permits
a particular data-link layer protocol type to be used with physical layer and application layer protocols in Type
combinations as specified explicitly in the profile parts. Use of the various protocol types in other combinations may
require permission from their respective intellectual-property-right holders.
International Standard IEC 61158-6-3 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
• corrections, in Table 10 and Table 48;

61158-6-3 © IEC:2010(E) – 9 –
• clarification in 6.9.1.2;
• expired patents deleted and new patents disclosed.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/607/FDIS 65C/621/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC web site.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be:
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
NOTE 2 The revision of this standard will be synchronized with the other parts of the IEC 61158 series.

– 10 – 61158-6-3 © IEC:2010(E)
INTRODUCTION
This part of IEC 61158 is one of a series produced to facilitate the interconnection of
automation system components. It is related to other standards in the set as defined by the
“three-layer” fieldbus reference model described in IEC/TR 61158-1.
The application protocol provides the application service by making use of the services
available from the data-link or other immediately lower layer. The primary aim of this standard
is to provide a set of rules for communication expressed in terms of the procedures to be
carried out by peer application entities (AEs) at the time of communication. These rules for
communication are intended to provide a sound basis for development in order to serve a
variety of purposes:
• as a guide for implementors and designers;
• for use in the testing and procurement of equipment;
• as part of an agreement for the admittance of systems into the open systems environment;
• as a refinement to the understanding of time-critical communications within OSI.
This standard is concerned, in particular, with the communication and interworking of sensors,
effectors and other automation devices. By using this standard together with other standards
positioned within the OSI or fieldbus reference models, otherwise incompatible systems may
work together in any combination.
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of patents concerning Type 3
elements and possibly other types given in the normative elements of this standard.
The following patent rights for Type 3 have been announced by [SI]:
Publication Title
EP0604668-A1 Logical ring with monitoring of rotation time
(06.07.1994);
EP0604668-B1
(18.02.1998)
EP0604669-A1 Bus system with monitoring of the activity state of participants
(06.07.1994);
EP0604669-B1
(01.04.1998)
IEC takes no position concerning the evidence, validity and scope of these patent rights.
The holder of these patent rights has assured the IEC that he/she is willing to negotiate
licences either fre
...