IEC 61158-3-12:2010
(Main)Industrial communication networks - Fieldbus specifications - Part 3-12: Data-link layer service definition - Type 12 elements
Industrial communication networks - Fieldbus specifications - Part 3-12: Data-link layer service definition - Type 12 elements
IEC 61158-3-12:2010 provides common elements for basic time-critical messaging communications between devices in an automation environment. It defines in an abstract way the externally visible service provided by the Type 12 fieldbus data-link layer in terms of:
- the primitive actions and events of the service;
- the parameters associated with each primitive action and event, and the form which they take;
- the interrelationship between these actions and events, and their valid sequences. This second edition cancels and replaces the first edition published in 2007. It constitutes a technical revision. The main changes with respect to the previous edition are editorial improvements. This bilingual version published in 2011-11, corresponds to the English version published in 2010-07.
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-12: Définition des services de couche liaison de données - Éléments de Type 12
La CEI 61158-3-12:2010 fournit les éléments communs pour les communications de messagerie de base à temps critique entre des dispositifs dans un environnement d'automation. Elle définit de manière abstraite le service visible de l'extérieur fourni par la couche liaison de données de réseau de terrain Type 12 en termes des:
- actions et événements primitifs du service;
- des paramètres associés à chaque action primitive et événement primitif, et la forme qu'ils prennent;
- de l'interrelation entre ces actions et événements, et leurs séquences valides. Elle annule et remplace la première édition, parue en 2007 et constitue une révision technique Par rapport à l'édition précédente cette édition contient des améliorations éditoriales. La présente version bilingue, correspond à la version anglaise monoligue publiée en 2010-07.
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IEC 61158-3-12
®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-12: Data-link layer service definition – Type 12 elements
IEC 61158-3-12:2010(E)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2010 IEC, Geneva, Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.
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IEC 61158-3-12
®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-12: Data-link layer service definition – Type 12 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 25.04.40; 35.100.20; 35.110 ISBN 978-2-88912-077-2
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – 61158-3-12 © IEC:2010(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
1.1 Overview .7
1.2 Specifications .7
1.3 Conformance.7
2 Normative references.8
3 Terms, definitions, symbols, abbreviations and conventions .8
3.1 Reference model terms and definitions .8
3.2 Service convention terms and definitions .9
3.3 Data-link service terms and definitions.10
3.4 Symbols and abbreviations .13
3.5 Common conventions .14
4 Data-link layer services and concepts .15
4.1 Operating principle .15
4.2 Topology .16
4.3 Data-link layer overview.16
4.4 Error detection overview .17
4.5 Parameter and process data handling introduction .17
4.6 Node reference model .17
4.7 Operation overview.18
4.8 Addressing .20
4.9 Slave classification .22
4.10 Structure of the communication layer in the slave.22
5 Communication services .23
5.1 Overview .23
5.2 Read services.24
5.3 Write services .27
5.4 Combined read/write services .29
5.5 Network services .33
5.6 Mailbox.34
6 Local interactions.39
6.1 Read local .39
6.2 Write local .39
6.3 Event local.40
Figure 1 – Mapping of logical data in an Ethernet frame consisting of a single Type 12
DLPDU .16
Figure 2 – Type 12 data-link reference model .18
Figure 3 – Type 12 segments in open mode .19
Figure 4 – Type 12 segment in direct mode .19
Figure 5 – Addressing mode overview .20
Figure 6 – Fieldbus memory management unit overview .21
Figure 7 – Layering of communication .23
Figure 8 – Flow of Type 12 service primitives .24
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61158-3-12 © IEC:2010(E) – 3 –
Figure 9 – Successful mailbox write sequence.35
Figure 10 – Successful mailbox read sequence .35
Table 1 – Auto-increment physical read (APRD) .24
Table 2 – Configured-addresse physical read (FPRD).25
Table 3 – Broadcast read (BRD).26
Table 4 – Logical read (LRD).26
Table 5 – Auto-increment physical write (APWR) .27
Table 6 – Configured-address physical write (FPWR) .27
Table 7 – Broadcast write (BWR) .28
Table 8 – Logical write (LWR) .29
Table 9 – Auto-increment physical read/write (APRW) .29
Table 10 – Configured-address physical read/write (FPRW).30
Table 11 – Broadcast read/write (BRW).31
Table 12 – Logical read/write (LRW).31
Table 13 – Auto-increment physical read / multiple write (ARMW).32
Table 14 – Configured-address physical read / multiple write (FRMW) .32
Table 15 – Provide network variable (PNV).33
Table 16 – Mailbox write.36
Table 17 – Mailbox read update.37
Table 18 – Mailbox read .38
Table 19 – Read local .39
Table 20 – Write local .39
Table 21 – Event local.40
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-12: Data-link layer service definition –
Type 12 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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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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.
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 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 of their respective intellectual-property-right holders.
International Standard IEC 61158-3-12 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:
• editorial improvements.
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61158-3-12 © IEC:2010(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
65C/604/FDIS 65C/618/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.
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– 6 – 61158-3-12 © 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.
Throughout the set of fieldbus standards, the term “service” refers to the abstract capability
provided by one layer of the OSI Basic Reference Model to the layer immediately above. Thus,
the data-link layer service defined in this standard is a conceptual architectural service,
independent of administrative and implementation divisions.
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61158-3-12 © IEC:2010(E) – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-12: Data-link layer service definition –
Type 12 elements
1 Scope
1.1 Overview
This part of IEC 61158 provides common elements for basic time-critical messaging
communications between devices in an automation environment. The term “time-critical” is
used to represent the presence of a time-window, within which one or more specified actions
are required to be completed with some defined level of certainty. Failure to complete specified
actions within the time window risks failure of the applications requesting the actions, with
attendant risk to equipment, plant and possibly human life.
This standard defines in an abstract way the externally visible service provided by the Type 12
fieldbus data-link layer in terms of
a) the primitive actions and events of the service;
b) the parameters associated with each primitive action and event, and the form which they
take;
c) the interrelationship between these actions and events, and their valid sequences.
The purpose of this standard is to define the services provided to
• the Type 12 fieldbus application layer at the boundary between the application and data-link
layers of the fieldbus reference model;
• systems management at the boundary between the data-link layer and systems
management of the fieldbus reference model.
1.2 Specifications
The principal objective of this standard is to specify the characteristics of conceptual data-link
layer services suitable for time-critical communications, and thus supplement the OSI Basic
Reference Model in guiding the development of data-link protocols for time-critical
communications. A secondary objective is to provide migration paths from previously-existing
industrial communications protocols.
This specification may be used as the basis for formal DL-Programming-Interfaces.
Nevertheless, it is not a formal programming interface, and any such interface will need to
address implementation issues not covered by this specification, including
a) the sizes and octet ordering of various multi-octet service parameters, and
b) the correlation of paired request and confirm, or indication and response, primitives.
1.3 Conformance
This standard does not specify individual implementations or products, nor does it constrain the
implementations of data-link entities within industrial automation systems.
There is no conformance of equipment to this data-link layer service definition standard.
Instead, conformance is achieved through implementation of the corresponding data-link
protocol that fulfills the Type 12 data-link layer services defined in this standard.
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2 Normative references
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.
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/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services
IEEE 802.1D, IEEE Standard for Local and metropolitan area networks – Media Access Control (MAC)
Bridges; available at
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
3.1.2 DL-connectionless-mode transmission [7498-1]
3.1.3 correspondent (N)-entities [7498-1]
correspondent DL-entities (N=2)
correspondent Ph-entities (N=1)
3.1.4 DL-duplex-transmission [7498-1]
[7498-1]
3.1.5 (N)-entity
DL-entity (N=2)
Ph-entity (N=1)
3.1.6 (N)-layer [7498-1]
DL-layer (N=2)
Ph-layer (N=1)
3.1.7 layer-management [7498-1]
3.1.8 peer-entities [7498-1]
3.1.9 primitive name [7498-3]
3.1.10 DL-protocol [7498-1]
3.1.11 DL-protocol-data-unit [7498-1]
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61158-3-12 © IEC:2010(E) – 9 –
3.1.12 DL-relay [7498-1]
[7498-1]
3.1.13 reset
3.1.14 responding-DL-address [7498-3]
[7498-1]
3.1.15 routing
3.1.16 segmenting [7498-1]
[7498-1]
3.1.17 (N)-service
DL-service (N=2)
Ph-service (N=1)
3.1.18 (N)-service-access-point [7498-1]
DL-service-access-point (N=2)
Ph-service-access-point (N=1)
3.1.19 DL-service-data-unit [7498-1]
3.1.20 DL-simplex-transmission [7498-1]
3.1.21 DL-subsystem [7498-1]
3.1.22 systems-management [7498-1]
3.1.23 DLS-user [7498-1]
3.1.24 DLS-user-data [7498-1]
3.2 Service convention terms and definitions
This standard also makes use of the following terms defined in ISO/IEC 10731 as they apply to
the data-link layer:
3.2.1 acceptor
3.2.2 asymmetrical service
3.2.3 confirm (primitive);
requestor.deliver (primitive)
3.2.4 deliver (primitive)
3.2.5 DL-service-primitive;
primitive
3.2.6 DL-service-provider
3.2.7 DL-service-user
3.2.8 DL-user-optional-facility
3.2.9 indication (primitive);
acceptor.deliver (primitive)
3.2.10 request (primitive);
requestor.submit (primitive)
3.2.11 requestor
3.2.12 response (primitive);
acceptor.submit (primitive)
3.2.13 submit (primitive)
3.2.14 symmetrical service
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3.3 Data-link service terms and definitions
3.3.1
application
function or data structure for which data is consumed or produced
3.3.2
application objects
multiple object classes that manage and provide a run time exchange of messages across the
network and within the network device
3.3.3
basic slave
slave device that supports only physical addressing of data
3.3.4
bit
unit of information consisting of a 1 or a 0. This is the smallest data unit that can be
transmitted
3.3.5
client
1) object which uses the services of another (server) object to perform a task
2) initiator of a message to which a server reacts
3.3.6
connection
logical binding between two application objects within the same or different devices
3.3.7
cyclic
events which repeat in a regular and repetitive manner
3.3.8
cyclic redundancy check (CRC)
residual value computed from an array of data and used as a representative signature for the
array
3.3.9
data
generic term used to refer to any information carried over a fieldbus
3.3.10
data consistency
means for coherent transmission and access of the input- or output-data object between and
within client and server
3.3.11
device
physical entity connected to the fieldbus composed of at least one communication element (the
network element) and which may have a control element and/or a final element (transducer,
actuator, etc.)
3.3.12
distributed clocks
method to synchronize slaves and maintain a global time base
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61158-3-12 © IEC:2010(E) – 11 –
3.3.13
DL-segment, link, local link
single DL-subnetwork in which any of the connected DLEs may communicate directly, without
any intervening DL-relaying, whenever all of those DLEs that are participating in an instance of
communication are simultaneously attentive to the DL-subnetwork during the period(s) of
attempted communication
3.3.14
error
discrepancy between a computed, observed or measured value or condition and the specified
or theoretically correct value or condition
3.3.15
event
instance of a change of conditions
3.3.16
fieldbus memory management unit
function that establishes one or several correspondences between logical addresses and
physical memory
3.3.17
fieldbus memory management unit entity
single element of the fieldbus memory management unit: one correspondence between a
coherent logical address space and a coherent physical memory location
3.3.18
frame
denigrated synonym for DLPDU
3.3.19
full slave
slave device that supports both physical and logical addressing of data
3.3.20
interface
shared boundary between two functional units, defined by functional characteristics, signal
characteristics, or other characteristics as appropriate
3.3.21
master
device that controls the data transfer on the network and initiates the media access of the
slaves by sending messages and that constitutes the interface to the control system
3.3.22
mapping
correspondence between two objects in that way that one object is part of the other object
3.3.23
medium
cable, optical fibre, or other means by which communication signals are transmitted between
two or more points
NOTE "media" is used as the plural of medium.
3.3.24
message
ordered series of octets intended to convey information
---------------------- Page: 13 ----------------------
– 12 – 61158-3-12 © IEC:2010(E)
NOTE Normally used to convey information between peers at the application layer.
3.3.25
network
set of nodes connected by some type of communication medium, including any intervening
repeaters, bridges, routers and lower-layer gateways
3.3.26
node
a) single DL-entity as it appears on one local link
b) end-point of a link in a network or a point at which two or more links meet [derived from
IEC 61158-2]
3.3.27
object
abstract representation of a particular component within a device
NOTE An object can be
a) an abstract representation of the capabilities of a device, composed of any or all of the following components:
1) data (information which changes with time);
2) configuration (parameters for behavior);
3) methods (things that can be done using data and configuration); or
b) a collection of related data (in the form of variables) and methods (procedures) for operating on that data that
have a clearly defined interface and behavior.
3.3.28
process data
data object containing application objects designated to be transferred cyclically or acyclically
for the purpose of processing
3.3.29
receiving DLS-user
DL-service user that acts as a recipient of DL-user-data
NOTE A DL-service user can be concurrently both a sending and receiving DLS-user.
3.3.30
sending DLS-user
DL-service user that acts as a source of DL-user-data
3.3.31
server
object which provides services to another (client) object
3.3.32
service
operation or function than an object and/or object class performs upon request from another
object and/or object class
3.3.33
slave
DL-entity accessing the medium only after being initiated by the preceding slave or the master
3.3.34
Sync manager
collection of control elements to coordinate access to concurrently used objects.
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61158-3-12 © IEC:2010(E) – 13 –
3.3.35
Sync manager channel
single control elements to coordinate access to concurrently used objects.
3.3.36
switch
MAC bridge as defined in IEEE 802.1D
3.4 Symbols and abbreviations
APRD Auto-increment physical read
APRW Auto-increment physical read/write
Auto-increment physical write
APWR
ARMW Auto-increment physical read / multiple write
BRD Broadcast read
BRW Broadcast read/write
BWR Broadcast write
Controller area network
CAN
CoE CAN application protocol over Type 12 services
CSMA/CD Carrier sense multiple access with collision detection
DC Distributed clocks
DL- Data-link layer (as a prefix)
DL-connection
DLC
DLCEP DL-connection-end-point
DLE DL-entity (the local active instance of the data-link layer)
DLL DL-layer
DLPCI DL-protocol-control-information
DL-protocol-data-unit
DLPDU
DLM DL-management
DLME DL-management en
...
IEC 61158-3-12
®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 3-12: Data-link layer service definition – Type 12 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-12: Définition des services de couche liaison de données – Éléments
de Type 12
IEC 61158-3-12:2010
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2010 IEC, Geneva, Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
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International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
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Vocabulary online.
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IEC 61158-3-12
®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 3-12: Data-link layer service definition – Type 12 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-12: Définition des services de couche liaison de données – Éléments
de Type 12
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 25.040.40; 35.100.20 ISBN 978-2-88912-806-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 2 – 61158-3-12 IEC:2010
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
1.1 Overview . 7
1.2 Specifications . 7
1.3 Conformance . 7
2 Normative references. 8
3 Terms, definitions, symbols, abbreviations and conventions . 8
3.1 Reference model terms and definitions . 8
3.2 Service convention terms and definitions . 9
3.3 Data-link service terms and definitions . 10
3.4 Symbols and abbreviations . 13
3.5 Common conventions . 14
4 Data-link layer services and concepts . 15
4.1 Operating principle . 15
4.2 Topology . 16
4.3 Data-link layer overview . 16
4.4 Error detection overview . 17
4.5 Parameter and process data handling introduction . 17
4.6 Node reference model . 17
4.7 Operation overview . 18
4.8 Addressing . 20
4.9 Slave classification . 22
4.10 Structure of the communication layer in the slave . 22
5 Communication services . 23
5.1 Overview . 23
5.2 Read services . 24
5.3 Write services . 27
5.4 Combined read/write services . 29
5.5 Network services . 33
5.6 Mailbox . 34
6 Local interactions . 39
6.1 Read local . 39
6.2 Write local . 39
6.3 Event local. 40
Figure 1 – Mapping of logical data in an Ethernet frame consisting of a single Type 12
DLPDU . 16
Figure 2 – Type 12 data-link reference model . 18
Figure 3 – Type 12 segments in open mode . 19
Figure 4 – Type 12 segment in direct mode . 19
Figure 5 – Addressing mode overview . 20
Figure 6 – Fieldbus memory management unit overview . 21
Figure 7 – Layering of communication . 23
Figure 8 – Flow of Type 12 service primitives . 24
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61158-3-12 IEC:2010 – 3 –
Figure 9 – Successful mailbox write sequence . 35
Figure 10 – Successful mailbox read sequence . 35
Table 1 – Auto-increment physical read (APRD) . 24
Table 2 – Configured-addresse physical read (FPRD) . 25
Table 3 – Broadcast read (BRD) . 26
Table 4 – Logical read (LRD) . 26
Table 5 – Auto-increment physical write (APWR) . 27
Table 6 – Configured-address physical write (FPWR) . 27
Table 7 – Broadcast write (BWR) . 28
Table 8 – Logical write (LWR) . 29
Table 9 – Auto-increment physical read/write (APRW) . 29
Table 10 – Configured-address physical read/write (FPRW). 30
Table 11 – Broadcast read/write (BRW) . 31
Table 12 – Logical read/write (LRW) . 31
Table 13 – Auto-increment physical read / multiple write (ARMW) . 32
Table 14 – Configured-address physical read / multiple write (FRMW) . 32
Table 15 – Provide network variable (PNV) . 33
Table 16 – Mailbox write. 36
Table 17 – Mailbox read update. 37
Table 18 – Mailbox read . 38
Table 19 – Read local . 39
Table 20 – Write local . 39
Table 21 – Event local . 40
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– 4 – 61158-3-12 IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-12: Data-link layer service definition –
Type 12 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.
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 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 of their respective intellectual-property-right holders.
International Standard IEC 61158-3-12 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:
• editorial improvements.
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61158-3-12 IEC:2010 – 5 –
This bilingual version published in 2011-11, corresponds to the English version published in
2010-07.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/604/FDIS 65C/618/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.
The French version of this standard has not been voted upon.
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.
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– 6 – 61158-3-12 IEC:2010
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.
Throughout the set of fieldbus standards, the term “service” refers to the abstract capability
provided by one layer of the OSI Basic Reference Model to the layer immediately above. Thus,
the data-link layer service defined in this standard is a conceptual architectural service,
independent of administrative and implementation divisions.
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61158-3-12 IEC:2010 – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-12: Data-link layer service definition –
Type 12 elements
1 Scope
1.1 Overview
This part of IEC 61158 provides common elements for basic time-critical messaging
communications between devices in an automation environment. The term “time-critical” is
used to represent the presence of a time-window, within which one or more specified actions
are required to be completed with some defined level of certainty. Failure to complete specified
actions within the time window risks failure of the applications requesting the actions, with
attendant risk to equipment, plant and possibly human life.
This standard defines in an abstract way the externally visible service provided by the Type 12
fieldbus data-link layer in terms of
a) the primitive actions and events of the service;
b) the parameters associated with each primitive action and event, and the form which they
take;
c) the interrelationship between these actions and events, and their valid sequences.
The purpose of this standard is to define the services provided to
• the Type 12 fieldbus application layer at the boundary between the application and data-link
layers of the fieldbus reference model;
• systems management at the boundary between the data-link layer and systems
management of the fieldbus reference model.
1.2 Specifications
The principal objective of this standard is to specify the characteristics of conceptual data-link
layer services suitable for time-critical communications, and thus supplement the OSI Basic
Reference Model in guiding the development of data-link protocols for time-critical
communications. A secondary objective is to provide migration paths from previously-existing
industrial communications protocols.
This specification may be used as the basis for formal DL-Programming-Interfaces.
Nevertheless, it is not a formal programming interface, and any such interface will need to
address implementation issues not covered by this specification, including
a) the sizes and octet ordering of various multi-octet service parameters, and
b) the correlation of paired request and confirm, or indication and response, primitives.
1.3 Conformance
This standard does not specify individual implementations or products, nor does it constrain the
implementations of data-link entities within industrial automation systems.
There is no conformance of equipment to this data-link layer service definition standard.
Instead, conformance is achieved through implementation of the corresponding data-link
protocol that fulfills the Type 12 data-link layer services defined in this standard.
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– 8 – 61158-3-12 IEC:2010
2 Normative references
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.
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/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services
IEEE 802.1D, IEEE Standard for Local and metropolitan area networks – Media Access Control (MAC)
Bridges; available at
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
3.1.2 DL-connectionless-mode transmission [7498-1]
[7498-1]
3.1.3 correspondent (N)-entities
correspondent DL-entities (N=2)
correspondent Ph-entities (N=1)
3.1.4 DL-duplex-transmission [7498-1]
[7498-1]
3.1.5 (N)-entity
DL-entity (N=2)
Ph-entity (N=1)
3.1.6 (N)-layer [7498-1]
DL-layer (N=2)
Ph-layer (N=1)
3.1.7 layer-management [7498-1]
[7498-1]
3.1.8 peer-entities
3.1.9 primitive name [7498-3]
[7498-1]
3.1.10 DL-protocol
3.1.11 DL-protocol-data-unit [7498-1]
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61158-3-12 IEC:2010 – 9 –
3.1.12 DL-relay [7498-1]
[7498-1]
3.1.13 reset
3.1.14 responding-DL-address [7498-3]
[7498-1]
3.1.15 routing
3.1.16 segmenting [7498-1]
[7498-1]
3.1.17 (N)-service
DL-service (N=2)
Ph-service (N=1)
3.1.18 (N)-service-access-point [7498-1]
DL-service-access-point (N=2)
Ph-service-access-point (N=1)
3.1.19 DL-service-data-unit [7498-1]
[7498-1]
3.1.20 DL-simplex-transmission
3.1.21 DL-subsystem [7498-1]
[7498-1]
3.1.22 systems-management
3.1.23 DLS-user [7498-1]
3.1.24 DLS-user-data [7498-1]
3.2 Service convention terms and definitions
This standard also makes use of the following terms defined in ISO/IEC 10731 as they apply to
the data-link layer:
3.2.1 acceptor
3.2.2 asymmetrical service
3.2.3 confirm (primitive);
requestor.deliver (primitive)
3.2.4 deliver (primitive)
3.2.5 DL-service-primitive;
primitive
3.2.6 DL-service-provider
3.2.7 DL-service-user
3.2.8 DL-user-optional-facility
3.2.9 indication (primitive);
acceptor.deliver (primitive)
3.2.10 request (primitive);
requestor.submit (primitive)
3.2.11 requestor
3.2.12 response (primitive);
acceptor.submit (primitive)
3.2.13 submit (primitive)
3.2.14 symmetrical service
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– 10 – 61158-3-12 IEC:2010
3.3 Data-link service terms and definitions
3.3.1
application
function or data structure for which data is consumed or produced
3.3.2
application objects
multiple object classes that manage and provide a run time exchange of messages across the
network and within the network device
3.3.3
basic slave
slave device that supports only physical addressing of data
3.3.4
bit
unit of information consisting of a 1 or a 0. This is the smallest data unit that can be
transmitted
3.3.5
client
1) object which uses the services of another (server) object to perform a task
2) initiator of a message to which a server reacts
3.3.6
connection
logical binding between two application objects within the same or different devices
3.3.7
cyclic
events which repeat in a regular and repetitive manner
3.3.8
cyclic redundancy check (CRC)
residual value computed from an array of data and used as a representative signature for the
array
3.3.9
data
generic term used to refer to any information carried over a fieldbus
3.3.10
data consistency
means for coherent transmission and access of the input- or output-data object between and
within client and server
3.3.11
device
physical entity connected to the fieldbus composed of at least one communication element (the
network element) and which may have a control element and/or a final element (transducer,
actuator, etc.)
3.3.12
distributed clocks
method to synchronize slaves and maintain a global time base
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61158-3-12 IEC:2010 – 11 –
3.3.13
DL-segment, link, local link
single DL-subnetwork in which any of the connected DLEs may communicate directly, without
any intervening DL-relaying, whenever all of those DLEs that are participating in an instance of
communication are simultaneously attentive to the DL-subnetwork during the period(s) of
attempted communication
3.3.14
error
discrepancy between a computed, observed or measured value or condition and the specified
or theoretically correct value or condition
3.3.15
event
instance of a change of conditions
3.3.16
fieldbus memory management unit
function that establishes one or several correspondences between logical addresses and
physical memory
3.3.17
fieldbus memory management unit entity
single element of the fieldbus memory management unit: one correspondence between a
coherent logical address space and a coherent physical memory location
3.3.18
frame
denigrated synonym for DLPDU
3.3.19
full slave
slave device that supports both physical and logical addressing of data
3.3.20
interface
shared boundary between two functional units, defined by functional characteristics, signal
characteristics, or other characteristics as appropriate
3.3.21
master
device that controls the data transfer on the network and initiates the media access of the
slaves by sending messages and that constitutes the interface to the control system
3.3.22
mapping
correspondence between two objects in that way that one object is part of the other object
3.3.23
medium
cable, optical fibre, or other means by which communication signals are transmitted between
two
...
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