EN 61158-4-16:2008

Industrial communication networks - Fieldbus specifications - Part 4-16: Data-link layer protocol specification - Type 16 elements

It provides basic time-critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all participating data-link entities in a synchronously-starting cyclic manner, according to a pre-established schedule, and 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. It includes the following significant changes with respect to the previous edition deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market relevance; addition of new types of fieldbuses; division of this part into multiple parts numbered.

Industrielle Kommunikationsnetze - Feldbusse - Teil 4-16: Protokollspezifikation des Data Link Layer (Sicherungsschicht) - Typ 16-Elemente

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-16: Spécification des protocoles des couches de liaison de données - Eléments de type 16

La CEI 61158-4-16:2007 définit la couche de liaison de données qui assure les communications de messagerie de base en temps critique entre des dispositifs dans un environnement d'automation. Elle spécifie les procédures de transfert opportun des données et des informations de commande entre une entité utilisateur de liaison de données et une entité utilisateur homologue, mais aussi parmi les entités de liaison de données formant le fournisseur de service de liaison de données distribué. Cette première édition et ses parties associées de la sous-série CEI 61158-4 annulent et remplacent la CEI 61158-4:2003. Elle comporte les modifications suivantes: - suppression du précédent bus de terrain Type 6 et du "placeholder" (réceptacle) pour une couche de liaison de données de bus de terrain Type 5, en raison du manque de pertinence commerciale; - ajout de nouveaux types de bus de terrain; - division de la présente partie en plusieurs parties numérotées -4 1, -4 2, ..., -4-19. La présente version bilingue (2013-09) correspond à la version anglaise monolingue publiée en 2007-12.

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-16. del: Specifikacija protokola na nivoju podatkovnih povezav - Elementi tipa 16 (IEC 61158-4-16:2007)

General Information

• Status: Published
• Publication Date: 28-Feb-2008
• Withdrawal Date: 31-Jan-2011
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.20 - Data link layer
• Technical Committee: CLC/TC 65X - Industrial-process measurement, control and automation
• Drafting Committee: IEC/SC 65C - IEC_SC_65C
• Parallel Committee: IEC/SC 65C - IEC_SC_65C
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 29-Feb-2008
• Completion Date: 29-Feb-2008
• Mandate: M/490 - Standardisation mandate to the European Standardisation Organisations (ESOs) to support European Smart Grid deployment
• Ref Project: SIST EN 61158-4-16:2008 - Industrial communication networks - Fieldbus specifications -- Part 4-16: Data-link layer protocol specification - Type 16 elements

Relations

• Replaces: EN 61491:1998 - Electrical equipment of industrial machines - Serial data link for real-time communication between controls and drives
• Effective Date: 28-Jan-2023
• Replaces: EN 61158-4:2004 - Digital data communication for measurement and control - Fieldbus for use in industrial control systems - Part 4: Data link protocol specification
• Effective Date: 28-Jan-2023

Overview

EN 61158-4-16:2008 is the CLC/CENELEC adoption of IEC 61158-4-16 and is part of the EN 61158 fieldbus family. It specifies the data‑link layer protocol (Type 16 elements) for industrial communication networks and fieldbus systems. The standard defines mechanisms for basic time‑critical messaging between automation devices, supporting scheduled, cyclic communication with synchronous cycle starts and both cyclic and acyclic asynchronous access within each cycle.

Key topics and technical requirements

• Deterministic cyclic communication: synchronous cycle start with pre‑established schedules giving each data‑link entity communication opportunities each cycle.
• Cyclic and acyclic access: supports both scheduled cyclic transfers and on‑demand (acyclic) transfers requested during cycles.
• DLPDU structures and telegram formats: definitions for master, device and application telegrams (MST, MDT, AT) and general telegram fields (BOF, address, INFO, FCS).
• Timing and phase control: timing diagrams and cycle phase definitions that govern start times, U/D bit timing and telegram intervals to meet time‑critical requirements.
• Network management: enable/disable cyclic communication, file transfer procedures, status and management services.
• Data transmission methods: service channel handling, SVC and RTC methods (as defined in the document) for command/response and real‑time data.
• DL management and access to physical layer (PhL): procedures for medium access and transitions between communication phases.
• Error handling and monitoring: invalid telegram handling, failure responses, timeout reactions and error counters for masters and slaves.
• Identification numbers (IDN): normative annex defining IDN structure and communication‑related IDNs used in device configuration and management.
• Conformance and interoperability notes: references to related parts (EN/IEC 61158‑2, ‑3‑16, ‑5‑16, ‑6‑16 and EN 61784). Some protocol types may be subject to intellectual‑property restrictions and permitted type combinations are identified in EN 61784.

Applications and who uses this standard

EN 61158-4-16 is used where deterministic, time‑critical fieldbus communication is required:

• Factory automation and process control engineers designing deterministic networks
• Device and fieldbus interface manufacturers (I/O modules, PLCs, motion controllers) implementing Type 16 data‑link functionality
• System integrators and OEMs specifying communication timing, cyclic schedules and error recovery procedures
• Test labs and certification bodies verifying conformance to fieldbus data‑link behavior
• Developers of drive systems and safety‑aware control networks using the EN 61158 family alongside EN 61784 profiles

Related standards

• EN/IEC 61158‑2: Physical layer specification and service definition
• EN/IEC 61158‑3‑16: Data‑link layer service definition (Type 16)
• EN 61158‑5‑16 / EN 61158‑6‑16: Complementary parts for Type 16
• EN 61784 series: fieldbus profiles and permitted type combinations

Keywords: EN 61158-4-16:2008, fieldbus, data‑link layer, industrial communication networks, Type 16, time‑critical messaging, cyclic communication, deterministic networking, fieldbus specifications.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2008
1DGRPHãþD
SIST EN 61158-4:2004
SIST EN 61491:2001
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-16. del:
Specifikacija protokola na nivoju podatkovnih povezav - Elementi tipa 16 (IEC
61158-4-16:2007)
Industrial communication networks - Fieldbus specifications -- Part 4-16: Data-link layer
protocol specification - Type 16 elements
Industrielle Kommunikationsnetze - Feldbusse - Teil 4-16: Protokollspezifikation des
Data Link Layer (Sicherungsschicht) - Typ 16-Elemente
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-16:
Spécification des protocoles des couches de liaison de données - Eléments de type 16
Ta slovenski standard je istoveten z: EN 61158-4-16:2008
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 61158-4-16
NORME EUROPÉENNE
February 2008
EUROPÄISCHE NORM
ICS 35.100.20; 25.040.40 Partially supersedes EN 61158-4:2004

English version
Industrial communication networks -
Fieldbus specifications -
Part 4-16: Data-link layer protocol specification -
Type 16 elements
(IEC 61158-4-16:2007)
Réseaux de communication industriels -  Industrielle Kommunikationsnetze -
Spécifications des bus de terrain - Feldbusse -
Partie 4-16: Spécification des protocoles Teil 4-16: Protokollspezifikation
des couches de liaison de données - des Data Link Layer (Sicherungsschicht) -
Eléments de type 16 Typ 16-Elemente
(CEI 61158-4-16:2007) (IEC 61158-4-16:2007)

This European Standard was approved by CENELEC on 2008-02-01. 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, Bulgaria, 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 and the 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

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61158-4-16:2008 E
Foreword
The text of document 65C/474/FDIS, future edition 1 of IEC 61158-4-16, 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 was approved by CENELEC as EN 61158-4-16 on 2008-02-01.
This and the other parts of the EN 61158-4 series supersede EN 61158-4:2004. Together with
EN 61158-2:2008 and its companion parts for Type 16, it also partially replaces EN 61491:1998 which is
at present being revised (to be issued as a Technical Report).
With respect to EN 61158-4:2004 the following changes were made:
– deletion of Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market
relevance;
– addition of new fieldbus types;
– partition into multiple parts numbered 4-1, 4-2, …, 4-19.
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) 2008-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-02-01
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
EN 61784 series. Use of the various protocol types in other combinations may require permission from their respective
intellectual-property-right holders.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61158-4-16:2007 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 61158-5-16 NOTE  Harmonized as EN 61158-5-16:2008 (not modified).
IEC 61158-6-16 NOTE  Harmonized as EN 61158-6-16:2008 (not modified).
IEC 61784-1 NOTE  Harmonized as EN 61784-1:2008 (not modified).
__________
- 3 - EN 61158-4-16:2008
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  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 61158-2 2007 Industrial communication networks - EN 61158-2 2008
Fieldbus specifications -
Part 2: Physical layer specification and
service definition
1) 2)
IEC 61158-3-16 - Industrial communication networks - EN 61158-3-16 2008
Fieldbus specifications -
Part 3-16: Data-link layer service definition -
Type 16 elements
3)
IEC 61800-7-20x (all Adjustable speed electrical power drive EN 61800-7-20x (all
sub- systems - Adjustable speed electrical power sub-
parts) drive systems - parts)
Part 7-20x: Generic interface and use of
profiles for power drive systems

1) 2)
ISO/IEC 7498-1 - Information technology - Open Systems EN ISO/IEC 7498-1 1995
Interconnection - Basic Reference Model:
The Basic Model
1)
ISO/IEC 7498-3 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
Naming and addressing
1)
ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic reference model -
Conventions for the definition of OSI services

1)
ISO/IEC 13239 - Information technology - Telecommunications - -
and information exchange between systems -
High-level data link control (HDLC)
procedures
1)
Undated reference.
2)
Valid edition at date of issue.
3)
At present, these subparts are IEC 61800-7-201, 7-202, 7-203 and 7-204.

Publication Year Title EN/HD Year
1)
ITU-T - Interface between Data Terminal Equipment - -
Recommendation (DTE) and Data Circuit-terminating Equipment
X.25 (DCE) for terminals operating in the packet
mode and connected to public data networks
by dedicated circuit
IEC 61158-4-16
Edition 1.0 2007-12
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-16: Data-link layer protocol specification – Type 16 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XE
ICS 35.100.20; 25.040.40 ISBN 2-8318-9441-7

– 2 – 61158-4-16 © IEC:2007(E)
CONTENTS
FOREWORD.7
INTRODUCTION.9
1 Scope.10
1.1 General .10
1.2 Specifications.10
1.3 Procedures.10
1.4 Applicability.10
1.5 Conformance.10
2 Normative references .11
3 Terms, definitions, symbols, abbreviations and conventions .11
3.1 Reference model terms and definitions.11
3.2 Service convention terms and definitions.13
3.3 Other terms and definitions .14
3.4 Abbreviations .18
3.5 Symbols .20
3.6 DLPDU IDN concept.21
4 DL-protocol overview.21
5 Basic DLPDU structure.22
5.1 Overview .22
5.2 MST DLPDU.23
5.3 MDT DLPDU .24
5.4 AT DLPDU .31
6 Network management methods.38
6.1 Overview .38
6.2 Enable and disable cyclic communication .38
6.3 File transfer.43
6.4 Status procedures .44
7 Data transmission methods .44
7.1 Overview .44
7.2 SVC .44
7.3 RTC .56
8 DL management .57
8.1 Overview .57
8.2 Access to PhL .57
9 Error handling and monitoring .62
9.1 Invalid telegrams .62
9.2 Response to MDT and AT telegram failure .63
9.3 Reaction to handshake timeout .64
9.4 Service channel error messages.65
9.5 Reaction to error messages in the service channel.67
9.6 Error counters in the master and the slave .67
9.7 Error effects on communication phases .69
9.8 Monitoring in the master .69
9.9 Monitoring in the slave .70
Annex A (normative) – IDN – Identification numbers .72
A.1 IDN specification .72

61158-4-16 © IEC:2007(E) – 3 –
A.2 Identification numbers in numerical orders .79
A.3 Detailed specification of communication-related IDNs .80
Bibliography.108

Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses .16
Figure 2 – Master service INFO field k .26
Figure 3 – Structure of the master data telegram .27
Figure 4 – Device service INFO field m .32
Figure 5 – Timing of U/D bits in CP5.36
Figure 6 – Timing of U/D bits in CP6.38
Figure 7 – Switching to CP0.43
Figure 8 – Phase transitions .43
Figure 9 – Service channel handling diagram.46
Figure 10 – Communication step proceeding diagram .48
Figure 11 – State machine for procedure command execution .53
Figure 12 – Interaction of procedure command control and acknowledgement .54
Figure 13 – Procedure command execution without interrupt .55
Figure 14 – Procedure command execution with interrupt .55
Figure 15 – Procedure command execution with error message.56
Figure 16 – Access to the transfer medium .58
Figure 17 – Timing diagram for CP0 .59
Figure 18 – Telegram transmission starting times of CP1 and CP2 .59
Figure 19 – Timing diagram for cyclic operation .60
Figure 20 – Telegram transmission times in CP5 .61
Figure 21 – Telegram transmission times in CP6 .61
Figure 22 – Required time intervals between telegrams .62
Figure A.1 – General IDN structure .73
Figure A.2 – IDN name structure.73
Figure A.3 – IDN data unit structure.76
Figure A.4 – Structure of IDN operation data with variable length .77
Figure A.5 – Example of the structure of an IDN-list.78
Figure A.6 – SLKN example.95

Table 1 – General telegram structure.22
Table 2 – BOF field.22
Table 3 – Device address field.23
Table 4 – FCS field .23
Table 5 – Master synchronization telegram structure .23
Table 6 – MST INFO field .24
Table 7 – Data fields of the master data telegram .24
Table 8 – Master real-time data (for each device) .25
Table 9 – Control word description (DLL) .25
Table 10 – Structure of the ID request telegram in CP1 .26

– 4 – 61158-4-16 © IEC:2007(E)
Table 11 – Structure of MDT in CP5 .27
Table 12 – Structure of Data Record in MDT in CP5 .28
Table 13 – File block size in CP5 .28
Table 14 – U/D control word in CP5 .28
Table 15 – Structure of MDT in CP6 .29
Table 16 – Structure of data record field in MDT in CP6 .30
Table 17 – U/D control word in CP6 .30
Table 18 – Data field of the acknowledge telegram .31
Table 19– AT real-time data (for each device).31
Table 20 – Status word description (DLL) .32
Table 21 – Structure of the ID acknowledge telegram in CP1.33
Table 22 – Structure of the operation data of device m in acknowledge telegram.33
Table 23 – Structure of AT in CP5 .34
Table 24 – Structure of data record in AT in CP5 .34
Table 25 – U/D status word in CP5 .34
Table 26 – File block index in CP5.35
Table 27 – Structure of AT in CP6 .36
Table 28 – Structure of data record in AT in CP6 .36
Table 29 – File block size in CP6 .36
Table 30 – U/D status word in CP6 .37
Table 31 – File block index in CP6.38
Table 32 – List of IDNs element and step numbers .47
Table 33 – Condition for modifying data block elements.47
Table 34 – SVC channel evaluation .49
Table 35 – IDN for list transfer .50
Table 36 – Procedure command control.50
Table 37 – Procedure command acknowledgment (data status) .51
Table 38 – Allowed jitter .58
Table 39 – Jitter in t .60
Table 40 – Jitter in t .61
Table 41 – Loss or failure of master synchronization telegram (MST) .63
Table 42 – Failure of master data telegrams (MDT) .64
Table 43 – Failure of acknowledge telegrams (AT).64
Table 44 – Reaction to handshake timeout .64
Table 45 – Error messages .65
Table 46 – Reaction to error message .67
Table 47 – States of error counters 1 in the master for MST and AT failures.67
Table 48 – States of error counter 1 in the devices for MST-failures in CP3 and CP4 .67
Table 49 – States of error counter 1 in the devices for MDT-failures in CP4.67
Table 50 – States of error counters 2 in the master for AT-failures.68
Table 51 – States of error counter 2 in the devices for MST-failures .68
Table 52 – States of error counter 2 in the devices for MDT-failures .69
Table 53 – Master monitoring.70

61158-4-16 © IEC:2007(E) – 5 –
Table 54 – Slave monitoring .71
Table A.1 – Data block structure .72
Table A.2 – IDN structure .73
Table A.3 – Element 3 of IDNs.74
Table A.4 – Valid combinations of the display formats .75
Table A.5 – Data status structure.79
Table A.6 – Communication related IDN list that are relevant for Type 16 .79
Table A.7 – Attributes for IDN S-0-0001.81
Table A.8 – Attributes for IDN S-0-0002.81
Table A.9 – Attributes for IDN S-0-0003.82
Table A.10 – Attributes for IDN S-0-0004 .82
Table A.11 – Attributes for IDN S-0-0006 .83
Table A.12 – Attributes for IDN S-0-0008 .83
Table A.13 – Attributes for IDN S-0-0009 .84
Table A.14 – Attributes for IDN S-0-0010 .84
Table A.15 – Attributes for IDN S-0-0011 .85
Table A.16 – Structure of C1D .85
Table A.17 – Attributes for IDN S-0-0014 .86
Table A.18 – Structure of interface status .86
Table A.19 – Attributes for IDN S-0-0015 .87
Table A.20 – Structure of telegram type parameter .88
Table A.21 – Attributes for IDN S-0-0016 .88
Table A.22 – Attributes for IDN S-0-0018 .89
Table A.23 – Attributes for IDN S-0-0019 .89
Table A.24 – Attributes for IDN S-0-0021 .90
Table A.25 – Attributes for IDN S-0-0022 .90
Table A.26 – Attributes for IDN S-0-0024 .91
Table A.27 – Attributes for IDN S-0-0028 .91
Table A.28 – Attributes for IDN S-0-0029 .92
Table A.29 – Attributes for IDN S-0-0087 .92
Table A.30 – Attributes for IDN S-0-0088 .93
Table A.31 – Attributes for IDN S-0-0089 .93
Table A.32 – Attributes for IDN S-0-0090 .94
Table A.33 – Attributes for IDN S-0-0096 .94
Table A.34 – Structure of SLKN .95
Table A.35 – Attributes for IDN S-0-0097 .95
Table A.36 – Structure of Mask C2D .96
Table A.37 – Attributes for IDN S-0-0098 .96
Table A.38 – Structure of Mask C3D .96
Table A.39 – Attributes for IDN S-0-0127 .97
Table A.40 – Attributes for IDN S-0-0128 .97
Table A.41 – Attributes for IDN S-0-0134 .98
Table A.42 – Attributes for IDN S-0-0135 .98

– 6 – 61158-4-16 © IEC:2007(E)
Table A.43 – Attributes for IDN S-0-0143 .99
Table A.44 – Structure of Type 16 version .99
Table A.45 – Attributes for IDN S-0-0185 .100
Table A.46 – Attributes for IDN S-0-0186 .100
Table A.47 – Attributes for IDN S-0-0187 .101
Table A.48 – Attributes for IDN S-0-0188 .101
Table A.49 – Attributes for IDN S-0-0301 .102
Table A.50 – Attributes for IDN S-0-0303 .102
Table A.51 – Attributes for IDN S-0-0305 .103
Table A.52 – Attributes for IDN S-0-0307 .103
Table A.53 – Attributes for IDN S-0-0394 .104
Table A.54 – Attributes for IDN S-0-0395 .104
Table A.55 – Attributes for IDN S-0-0396 .105
Table A.56 – Attributes for IDN S-0-0397 .105
Table A.57 – Attributes for IDN S-0-0413 .106
Table A.58 – Attributes for IDN S-0-0414 .106
Table A.59 – Attributes for IDN S-0-0415 .107
Table A.60 – Attributes for IDN S-0-0416 .107

61158-4-16 © IEC:2007(E) – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 4-16: Data-link layer protocol specification – Type 16 elements

FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
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 IEC 61784 series. Use of the various protocol types in other
combinations may require permission from their respective intellectual-property-right holders.
International Standard IEC 61158-4-16 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This first edition and its companion parts of the IEC 61158-4 subseries cancel and replace
IEC 61158-4:2003. This edition of this part constitutes a technical addition. This publication,
together with its companion parts for Type 16, also partially replaces IEC 61491:2002 which is
at present being revised. IEC 61491 will be issued as a technical report.
This edition of IEC 61158-4 includes the following significant changes from the previous
edition:
– 8 – 61158-4-16 © IEC:2007(E)
a) deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data link
layer, for lack of market relevance;
b) addition of new types of fieldbuses;
c) division of this part into multiple parts numbered -4-1, -4-2, …, -4-19.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/474/FDIS 65C/485/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.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
The list of all the parts of the IEC 61158 series, under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC web site.

61158-4-16 © IEC:2007(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.

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INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 4-16: Data-link layer protocol specification – Type 16 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.
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.
61158-4-16 © IEC:2007(E) – 11 –
2 Normative references
The following referenced documents are indispensable for the application of this standard. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 61158-2 (Ed.4.0), Industrial communication networks – Fieldbus specifications – Part 2:
Physical layer specification and service definition
IEC 61158-3-16, Industrial communication networks – Fieldbus specifications - Part 3-16:
Data-link layer service definition – Type 16 elements
IEC 61800-7-20x (all subparts), Adjustable speed electrical power drive systems – Part 7-20x:
Generic interface and use of profiles for power drive systems – Profile type x specification
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Part 1: Basic
Reference Model: The Basic Model
ISO/IEC 7498-3, Information technology – Open Systems Interconnection – Part 3: Basic
Reference Model: Naming and addressing
ISO/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services
ISO/IEC 13239, Information technology – Telecommunications and information exchange
between systems – High-level data link control (HDLC) procedures
ITU X.25, Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating
Equipment (DCE) for terminals operating in the packet mode and connected to public data
networks by dedicated circuit
3 Terms, definitions, symbols, abbreviations and conventions
For the purposes of this document, the following terms, definitions, symbols, abbreviations
and conventions apply.
3.1 Reference model terms and definitions
This standard is based in part on the concepts developed in ISO/IEC 7498-1 and ISO/IEC
7498-3, and makes use of the following terms defined therein:
[7498-3]
3.1.1 DL-address
[7498-1]
3.1.2 DL-address-mapping
[7498-3]
3.1.3 called-DL-address
[7498-3]
3.1.4 calling-DL-address
[7498-1]
3.1.5 centralized multi-end-point-connection
[7498-1]
3.1.6 DL-connection
[7498-1]
3.1.7 DL-connection-end-point
———————
At present, these subparts are IEC 61800-7-201, 7-202, 7-203 and 7-204.

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[7498-1]
3.1.8 DL-connection-end-point-identifier
[7498-1]
3.1.9 DL-connection-mode transmission
[7498-1]
3.1.10 DL-connectionless-mode transmission
[7498-1]
3.1.11 correspondent (N)-entities
correspondent DL-entities  (N=2)
correspondent Ph-entities  (N=1)
[7498-1]
3.1.
...