EN 61158-4-19:2012

SLOVENSKI STANDARD
01-julij-2012
1DGRPHãþD
SIST EN 61158-4-19:2008
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-19. del:
Specifikacija protokola na nivoju podatkovnih povezav - Elementi tipa 19 (IEC
61158-4-19:2010)
Industrial communication networks - Fieldbus specifications - Part 4-19: Data-link layer
protocol specification - Type 19 elements (IEC 61158-4-19:2010)
Industrielle Kommunikationsnetze - Feldbusse - Teil 4-19: Protokollspezifikation des
Data Link Layer (Sicherungsschicht) - Typ 19-Elemente (IEC 61158-4-19:2010)
Réseaux de communication industriels - Spécifications de bus de terrain - Partie 4-19:
Spécification du protocole de couche de liaison de données - Eléments de Type 19 (CEI
61158-4-19:2010)
Ta slovenski standard je istoveten z: EN 61158-4-19:2012
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.20 Podatkovni povezovalni sloj Data link layer
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61158-4-19
NORME EUROPÉENNE
May 2012
EUROPÄISCHE NORM
ICS 25.040.40; 35.100.20; 35.110 Supersedes EN 61158-4-19:2008

English version
Industrial communication networks -
Fieldbus specifications -
Part 4-19: Data-link layer protocol specification -
Type 19 elements
(IEC 61158-4-19:2010)
Réseaux de communication industriels -  Industrielle Kommunikationsnetze -
Spécifications de bus de terrain - Feldbusse -
Partie 4-19: Spécification du protocole de Teil 4-19: Protokollspezifikation des Data
couche de liaison de données - Link Layer (Sicherungsschicht) -
Eléments de Type 19 Typ 19-Elemente
(CEI 61158-4-19:2010) (IEC 61158-4-19:2010)

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 61158-4-19:2012 E
Foreword
The text of document 65C/605/FDIS, future edition 2 of IEC 61158-4-19, 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 61158-4-19:2012.
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
(dow) 2015-03-28
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61158-4-19:2008.
19:2008:
 increasing the number of supported devices (511 instead of 254);
 introducing a communication version identification;
 adding a mechanism for remote address allocation;
 introducing enhanced parameter addressing (32 bit instead of 16 bit);
 restructuring control and status word;
 improving the redundancy and hotplug features;
 improving the error handling;
 adding a multiplexing protocol (SMP: Type 19 Messaging Protocol).
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 61158-4-19:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 61131 series NOTE  Harmonized in EN 61131 series.
IEC/TR 61158-1:2010 NOTE  Harmonized as CLC/TR 61158-1:2010 (not modified).
IEC 61158-3-19:2010 NOTE  Harmonized as EN 61158-3-19:2012 (not modified).
IEC 61158-5-16:2007 NOTE  Harmonized as EN 61158-5-16:2008 (not modified).
IEC 61158-5-19:2010 NOTE  Harmonized as EN 61158-5-19:2012 (not modified).
IEC 61158-6-16:2007 NOTE  Harmonized as EN 61158-6-16:2008 (not modified).
IEC 61158-6-19:2010 NOTE  Harmonized as EN 61158-6-19:2012 (not modified).
IEC 61800-7-20x series NOTE  Harmonized in EN 61800-7-20x series.

- 3 - EN 61158-4-19:2012
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 61158-4-16 2007 Industrial communication networks - Fieldbus EN 61158-4-16 2008
specifications -
Part 4-16: Data-link layer protocol
specification - Type 16 elements

ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
ISO/IEC 7498-3 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
Naming and addressing
ISO/IEC 8802-3 - Information technology - Telecommunications - -
and information exchange between systems -
Local and metropolitan area networks -
Specific requirements -
Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access method
and physical layer specifications

ISO 8601 2004 Data elements and interchange formats - - -
Information interchange - Representation of
dates and times
IEC 61158-4-19 ®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Fieldbus specifications –
Part 4-19: Data-link layer protocol specification – Type 19 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XF
ICS 25.04.40; 35.100.20; 35.110 ISBN 978-2-88912-090-1
– 2 – 61158-4-19 © IEC:2010(E)
CONTENTS
FOREWORD.7
INTRODUCTION.9
1 Scope.11
1.1 General .11
1.2 Specifications.11
1.3 Procedures.11
1.4 Applicability.11
1.5 Conformance.12
2 Normative references .12
3 Terms, definitions, symbols, abbreviations and conventions .12
3.1 Reference model terms and definitions.12
3.2 Additional Type 19 terms and definitions .12
3.3 Symbols .15
3.4 Abbreviations .16
3.5 Additional conventions .17
4 DL-protocol overview.18
5 DLPDU structure .19
5.1 Overview .19
5.2 General DLPDU identification.19
5.3 General DLPDU structure.20
5.4 DLPDU header .21
5.5 MDT DLPDU .21
5.6 AT DLPDU .32
6 DL management .42
6.1 Overview .42
6.2 Enable and disable cyclic communication .42
6.3 Hot-plug procedure.50
6.4 Status procedures .51
7 Data transmission methods .51
7.1 Overview .51
7.2 SVC .52
7.3 RTC .52
7.4 Multiplexing of real-time data with data containers .52
7.5 Multiplexing of real-time data using SMP.59
8 Telegram timing and DLPDU handling .62
8.1 Usage of real-time channel with different network topologies.62
8.2 Communication mechanisms .63
8.3 Device synchronization.69
9 Error handling and monitoring .70
9.1 Failure of telegrams .70
9.2 Response to MDT and AT telegram failure .70
9.3 Service channel error messages.71
Annex A (normative) IDN – Identification numbers .72
Annex B (normative) SCP– Classification.106
Annex C (normative) GDP (Generic Device Profile) . 118

61158-4-19 © IEC:2010(E) – 3 –
Bibliography.140

Figure 1 – Valid MDT and AT telegram combinations .19
Figure 2 – Offsets within MDT payload.26
Figure 4 – Communication phase transitions.43
Figure 6 – Block diagram of master and slave.63
Figure 7 – Telegram sequence.65
Figure 8 – Beginning of telegram .66
Figure 9 – Access to the medium .66
Figure 10 – Timing diagram of CP0.68
Figure 11 – Timing diagram of CP1 and CP2 with 2 MDT/AT .69
Figure 12 – Timing diagram of CP1 and CP2 with 2 MDT/AT .69
Figure 13 – Synchronization timing .70
Figure 14 – Synchronization signal generation.70
Figure A.1 – Lengths of MDTs (example) .80
Figure A.2 – Lengths of ATs (example) .82
Figure A.3 – Structure of MAC address.87
Figure A.4 – Structure of IP address .88
Figure A.5 – Structure of subnet mask .88
Figure A.6 – Structure of gateway address .89
Figure B.1 – Technical Profiling in Type 19.106
Figure C.1 – Type 19 state machine .121

Table 1 – Ethernet DLPDU identification .20
Table 2 – Data structure in a DLPDU .20
Table 3 – DLPDU payload header.21
Table 4 – DLPDU type .21
Table 5 – MDT MST header .22
Table 6 – MDT MST fields to be considered by the slave .22
Table 7 – MDT phase.22
Table 8 – MDT0 structure in CP0 .23
Table 9 – Communication version .23
Table 10 – MDT0 in CP1 and CP2 .24
Table 11 – MDT1 in CP1 and CP2 .24
Table 12 – MDT2 in CP1 and CP2 .25
Table 13 – MDT3 in CP1 and CP2 .25
Table 14 – MDT data field.26
Table 15 – MDT hot-plug field in HP0 and HP1 .27
Table 16 – Device address field .27
Table 17 – HP control field (in HP0 and HP1) .28
Table 18 – MDT service channel field .29
Table 19 – MDT SVC (for each slave) .29
Table 20 – SVC control word (DLL).29

– 4 – 61158-4-19 © IEC:2010(E)
Table 21 – MDT real-time data field .30
Table 22 – MDT real-time data (device control).30
Table 23 – MDT real-time data (connection data).30
Table 24 – Device control field.31
Table 25 – Connection control .31
Table 26 – Structure of a configured connection .32
Table 27 – AT MST header .32
Table 28 – AT MST fields to be considered by the slave .33
Table 29 – AT0 structure in CP0 .33
Table 30 – AT0 in CP1 and CP2 .34
Table 31 – AT1 in CP1 and CP2 .35
Table 32 – AT2 in CP1 and CP2 .35
Table 33 – AT3 in CP1 and CP2 .36
Table 34 – AT data field.36
Table 35 – AT hot-plug field in HP0 and HP1 .37
Table 36 – HP status field (in HP0 and HP1).38
Table 37 – AT service channel field .38
Table 38 – AT SVC (for each slave).38
Table 39 – AT SVC status description (DLL) .39
Table 40 – AT real-time data field .39
Table 41 – AT real-time data (device status).40
Table 42 – AT real-time data (connection data).40
Table 43 – Device status field .41
Table 44 – MDT hot-plug field in CP3 and after ring recovery .47
Table 45 – Structure of the Session Control Header.60
Table A.1 – List of relevant communication-related IDNs .72
Table A.2 – Attributes of IDN S-0-1000 .75
Table A.3 – Attributes of IDN S-0-1002 .76
Table A.4 – Attributes of IDN S-0-1003 .76
Table A.5 – Attributes of IDN S-0-1005 .77
Table A.6 – Attributes of IDN S-0-1006 .77
Table A.7 – Attributes for IDN S-0-1007.78
Table A.8 – Attributes for IDN S-0-1008.79
Table A.9 – Attributes of IDN S-0-1009 .79
Table A.10 – C-Dev Offset in MDT .80
Table A.11 – Attributes of IDN S-0-1010 .80
Table A.12 – Attributes of IDN S-0-1011 .81
Table A.13 – S-Dev Offset in AT .81
Table A.14 – Attributes of IDN S-0-1012 .82
Table A.15 – Attributes of IDN S-0-1013 .83
Table A.16 – SVC Offset in MDT.83
Table A.17 – Attributes of IDN S-0-1014 .84
Table A.18 – SVC Offset in AT.84

61158-4-19 © IEC:2010(E) – 5 –
Table A.19 – Attributes of IDN S-0-1015 .85
Table A.20 – Attributes of IDN S-0-1016 .85
Table A.21 – Attributes of IDN S-0-1017 .86
Table A.22 – Attributes of IDN S-0-1019 .86
Table A.23 – Attributes of IDN S-0-1020 .87
Table A.24 – Attributes of IDN S-0-1021 .88
Table A.25 – Attributes of IDN S-0-1022 .89
Table A.26 – Attributes of IDN S-0-1023 .90
Table A.27 – Attributes of IDN S-0-1024 .90
Table A.28 – Attributes of IDN S-0-1026 .91
Table A.29 – Attributes of IDN S-0-1027.0.1 .91
Table A.30 – Attributes of IDN S-0-1027.0.2 .92
Table A.31 – Attributes of IDN S-0-1028 .92
Table A.32 – Attributes of IDN S-0-1035 .93
Table A.33 – Attributes of IDN S-0-1040 .93
Table A.34 – Attributes of IDN S-0-1041 .94
Table A.35 – Attributes of IDN S-0-1044 .94
Table A.36 – Attributes of IDN S-0-1045 .95
Table A.37 – Attributes of IDN S-0-1046 .95
Table A.38 – Attributes of IDN S-0-1050.x.1 .96
Table A.39 – Attributes of IDN S-0-1050.x.2 .96
Table A.40 – Attributes of IDN S-0-1050.x.3 .97
Table A.41 – Attributes of IDN S-0-1050.x.4 .97
Table A.42 – Attributes of IDN S-0-1050.x.5 .98
Table A.43 – Attributes of IDN S-0-1050.x.6 .98
Table A.44 – Attributes of IDN S-0-1050.x.8 .99
Table A.45 – Attributes of IDN S-0-1050.x.10.99
Table A.46 – Attributes of IDN S-0-1050.x.11.100
Table A.47 – Attributes of IDN S-0-1050.x.12.100
Table A.48 – Attributes of IDN S-0-1050.x.20.101
Table A.49 – Attributes of IDN S-0-1050.x.21.101
Table A.50 – Attributes of IDN S-0-1051 .102
Table A.51 – Attributes of IDN S-0-1100.0.1 .102
Table A.52 – Attributes of IDN S-0-1100.0.2 .103
Table A.53 – Attributes of IDN S-0-1100.0.3 .103
Table A.54 – Attributes of IDN S-0-1101.x.1 .104
Table A.55 – Attributes of IDN S-0-1101.x.2 .104
Table A.56 – Attributes of IDN S-0-1101.x.3 .105
Table C.1 – List of relevant communication-related IDNs .123
Table C.2 – Attributes of IDN S-0-1300.x.1 .124
Table C.3 – Attributes of IDN S-0-1300.x.2 .125
Table C.4 – Attributes of IDN S-0-1300.x.3 .125
Table C.5 – Attributes of IDN S-0-1300.x.4 .126

– 6 – 61158-4-19 © IEC:2010(E)
Table C.6 – Attributes of IDN S-0-1300.x.5 .126
Table C.7 – Attributes of IDN S-0-1300.x.6 .127
Table C.8 – Attributes of IDN S-0-1300.x.7 .127
Table C.9 – Attributes of IDN S-0-1300.x.8 .128
Table C.10 – Attributes of IDN S-0-1300.x.9 .128
Table C.11 – Attributes of IDN S-0-1300.x.10 .129
Table C.12 – Attributes of IDN S-0-1300.x.11 .129
Table C.13 – Attributes of IDN S-0-1300.x.12 .130
Table C.14 – Attributes of IDN S-0-1300.x.13 .130
Table C.15 – Attributes of IDN S-0-1300.x.14 .131
Table C.16 – Attributes of IDN S-0-1300.x.20 .131
Table C.17 – Attributes of IDN S-0-1300.x.21 .132
Table C.18 – Attributes of IDN S-0-1300.x.22 .132
Table C.19 – Attributes of IDN S-0-1300.x.23 .133
Table C.20 – Attributes of IDN S-0-1301 .133
Table C.21 – Coding of S-1301.134
Table C.22 – Attributes of IDN S-0-1302.x.1 .134
Table C.23 – Coding of S-1302.x.1 .135
Table C.24 – Attributes of IDN S-0-1302.x.2 .135
Table C.25 – Attributes of IDN S-0-1302.x.3 .136
Table C.26 – Attributes of IDN S-0-1303.0.1 .136
Table C.27 – Attributes of IDN S-0-1303.0.2 .137
Table C.28 – Coding of S-1303.0.2 .137
Table C.29 – Attributes of IDN S-0-1303.0.3 .137
Table C.30 – Coding of S-1303.0.2 .138
Table C.31 – Attributes of IDN S-0-1303.0.10 .138
Table C.32 – Attributes of IDN S-0-1303.0.11 .139
Table C.33 – Attributes of IDN S-0-1305.0.1 .139

61158-4-19 © IEC:2010(E) – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 4-19: Data-link layer protocol specification –
Type 19 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,
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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.
International Standard IEC 61158-4-19 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:
• increasing the number of supported devices (511 instead of 254);
• introducing a communication version identification;
• adding a mechanism for remote address allocation;
• introducing enhanced parameter addressing (32 bit instead of 16 bit);
• restructuring control and status word;
• improving the redundancy and hotplug features;

– 8 – 61158-4-19 © IEC:2010(E)
• improving the error handling;
• adding a multiplexing protocol (SMP: Type 19 Messaging Protocol).
The text of this standard is based on the following documents:
FDIS Report on voting
65C/605/FDIS 65C/619/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 the 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 The revision of this standard will be synchronized with the other parts of the IEC 61158 series.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

61158-4-19 © IEC:2010(E) – 9 –
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 data-link protocol provides the data-link service by making use of the services available
from the physical 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 data-link
entities (DLEs) 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:
a) as a guide for implementors and designers;
b) for use in the testing and procurement of equipment;
c) as part of an agreement for the admittance of systems into the open systems environment;
d) 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.
NOTE 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.
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
19 elements and possibly other types given in this document as follows:
DE 102 37 097 [RI] Korrektur von Signallaufzeiten in verteilten
Kommunikationssystemen
DE 102 00 405 0416.4-42 [RI] Verfahren zur Synchronisation in einem redundanten
Kommunikationssystem
DE 102 00 502 4759.8-32 [RI] Verfahren zur Laufzeitkorrektur in einer Kommunikationsstruktur
DE 102 00 4056364.0-31 [RI] Verfahren zum Betreiben eines Netzwerks mit Ringtopologie
DE 103 12 907.3-31 [RI] Kommunikationssystem mit redundanter Kommunikation
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
licenses either free of charge or under reasonable and non-discriminatory terms and
conditions with applicants throughout the world. In this respect, the statement of the holder of
these patent rights is registered with IEC. Information may be obtained from:
[RI] Rexroth Indramat GmbH
Bgm.-Dr.-Nebel-Str. 2
D - 97816 Lohr
Germany
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 shall not be held responsible for
identifying any or all such patent rights.

– 10 – 61158-4-19 © IEC:2010(E)
ISO (www.iso.org/patents) and IEC (http://www.iec.ch/tctools/patent_decl.htm) maintain on-
line data bases of patents relevant to their standards. Users are encouraged to consult the
data bases for the most up to date information concerning patents.

61158-4-19 © IEC:2010(E) – 11 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 4-19: Data-link layer protocol specification –
Type 19 elements
1 Scope
1.1 General
The data-link layer provides basic time-critical messaging communications between devices in
an automation environment.
This protocol provides communication opportunities to all participating data-link entities
a) in a synchronously-starting cyclic manner, according to a pre-established schedule, and
b) in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those
data-link entities.
Thus this protocol can be characterized as one which provides cyclic and acyclic access
asynchronously but with a synchronous restart of each cycle.
1.2 Specifications
This standard specifies
a) procedures for the timely transfer of data and control information from one data-link user
entity to a peer user entity, and among the data-link entities forming the distributed data-
link service provider;
b) the structure of the fieldbus DLPDUs used for the transfer of data and control information
by the protocol of this standard, and their representation as physical interface data units.
1.3 Procedures
The procedures are defined in terms of
a) the interactions between peer DL-entities (DLEs) through the exchange of fieldbus
DLPDUs;
b) the interactions between a DL-service (DLS) provider and a DLS-user in the same system
through the exchange of DLS primitives;
c) the interactions between a DLS-provider and a Ph-service provider in the same system
through the exchange of Ph-service primitives.
1.4 Applicability
These procedures are applicable to instances of communication between systems which
support time-critical communications services within the data-link layer of the OSI or fieldbus
reference models, and which require the ability to interconnect in an open systems
interconnection environment.
Profiles provide a simple multi-attribute means of summarizing an implementation’s
capabilities, and thus its applicability to various time-critical communications needs.

– 12 – 61158-4-19 © IEC:2010(E)
1.5 Conformance
This standard also specifies conformance requirements for systems implementing these
procedures. This part of this standard does not contain tests to demonstrate compliance with
such requirements.
2 Normative references
The following referenc
...