IEC 61158-3-14:2014

IEC 61158-3-14 ®
Edition 3.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 3-14: Data-link layer service definition – Type 14 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-14: Définition des services de la couche liaison de données – Eléments
de type 14
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IEC 61158-3-14 ®
Edition 3.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –

Part 3-14: Data-link layer service definition – Type 14 elements

Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 3-14: Définition des services de la couche liaison de données – Eléments

de type 14
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-1715-3

– 2 – IEC 61158-3-14:2014 © IEC 2014
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
1.1 General . 6
1.2 Specifications . 6
1.3 Conformance . 6
2 Normative references . 7
3 Terms, definitions, symbols, abbreviations and conventions . 7
3.1 Reference model terms and definitions . 7
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 . 15
4 DL service and concept . 16
4.1 General . 16
4.2 Services provided by the DLL . 17
5 DL-management services . 17
5.1 Overview . 17
5.2 Non-periodic data annunciation . 17
5.3 EndofNonPeriodicDataSendingAnnunciation service . 19
5.4 DL-management for FRT applications. 20
Bibliography . 22

Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 11
Figure 2 – Communication model . 16
Figure 3 – Sequence of non-periodic data annunciation service and end of non-
periodic data annunciation service . 18

Table 1 – Non-periodic data annunciation primitives and parameters . 18
Table 2 – EndofNonPeriodicDataSending service primitives and parameters . 19
Table 3 – DL-management service primitives and parameters. 20

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-14: Data-link layer service definition –
Type 14 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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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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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.
Attention is drawn to the fact that the use of the associated protocol type is restricted by its
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 layer protocol type to
be used with other layer protocols of the same type, or in other type combinations explicitly
authorized by its intellectual-property-right holders.
NOTE Combinations of protocol types are specified in IEC 61784-1 and IEC 61784-2.
International Standard IEC 61158-3-14 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision. The main changes with respect to the previous edition are
listed below:
– 4 – IEC 61158-3-14:2014 © IEC 2014
• provide stability date for the publication;
• update the edition of IEC 61588;
• update the Communication model;
• update the primitives and parameters of the DL-management service for FRT applications
in 5.4.2;
• correct the edit error;
• update of the requirements for all conformance classes;
• update of the requirements for all conformance services.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/759/FDIS 65C/769/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.
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 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.

– 6 – IEC 61158-3-14:2014 © IEC 2014
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-14: Data-link layer service definition –
Type 14 elements
1 Scope
1.1 General
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
14 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; and
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 14 fieldbus application layer at the boundary between the application and data-
link layers of the fieldbus reference model, and
• 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 do they 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 14 data-link layer services defined in this standard.

2 Normative references
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 All parts of the IEC 61158 series, as well as IEC 61784-1 and IEC 61784-2 are maintained simultaneously.
Cross-references to these documents within the text therefore refer to the editions as dated in this list of normative
references.
IEC 61588:2009, Precision clock synchronization protocol for networked measurement and
control systems
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Basic Reference
Model – Basic Reference Model: The Basic Model
ISO/IEC 7498-3, Information technology – Open Systems Interconnection – Basic Reference
Model – 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
RFC 768, User Datagram Protocol, available at
RFC 791, Internet protocol, available at
RFC 793, Transmission Control Protocol, 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:
3.1.1 DL-address [ISO/IEC 7498-3]
3.1.2 DL-address-mapping [ISO/IEC 7498-1]
3.1.3 called-DL-address [ISO/IEC 7498-3]
3.1.4 calling-DL-address [ISO/IEC 7498-3]
3.1.5 centralized multi-end-point-connection [ISO/IEC 7498-1]
3.1.6 DL-connection [ISO/IEC 7498-1]
3.1.7 DL-connection-end-point [ISO/IEC 7498-1]

– 8 – IEC 61158-3-14:2014 © IEC 2014
3.1.8 DL-connection-end-point-identifier [ISO/IEC 7498-1]
3.1.9 DL-connection-mode transmission [ISO/IEC 7498-1]
3.1.10 DL-connectionless-mode transmission [ISO/IEC 7498-1]
3.1.11 correspondent (N)-entities [ISO/IEC 7498-1]
correspondent DL-entities  (N=2)
correspondent Ph-entities  (N=1)
3.1.12 DL-duplex-transmission [ISO/IEC 7498-1]
3.1.13 (N)-entity [ISO/IEC 7498-1]
DL-entity  (N=2)
Ph-entity  (N=1)
3.1.14 DL-facility [ISO/IEC 7498-1]
3.1.15 flow control [ISO/IEC 7498-1]
3.1.16 (N)-layer [ISO/IEC 7498-1]
DL-layer  (N=2)
Ph-layer  (N=1)
3.1.17 layer-management [ISO/IEC 7498-1]
3.1.18 DL-local-view [ISO/IEC 7498-3]
3.1.19 DL-name [ISO/IEC 7498-3]
3.1.20 naming-(addressing)-domain [ISO/IEC 7498-3]
3.1.21 peer-entities [ISO/IEC 7498-1]
3.1.22 primitive name [ISO/IEC 7498-3]
3.1.23 DL-protocol [ISO/IEC 7498-1]
3.1.24 DL-protocol-connection-identifier [ISO/IEC 7498-1]
3.1.25 DL-protocol-data-unit [ISO/IEC 7498-1]
3.1.26 DL-relay [ISO/IEC 7498-1]
3.1.27 Reset
[ISO/IEC 7498-1]
3.1.28 responding-DL-address [ISO/IEC 7498-3]
3.1.29 routing [ISO/IEC 7498-1]
3.1.30 segmenting [ISO/IEC 7498-1]
3.1.31 (N)-service [ISO/IEC 7498-1]
DL-service  (N=2)
Ph-service  (N=1)
3.1.32 (N)-service-access-point [ISO/IEC 7498-1]
DL-service-access-point  (N=2)
Ph-service-access-point  (N=1)
3.1.33 DL-service-access-point-address [ISO/IEC 7498-3]
3.1.34 DL-service-connection-identifier [ISO/IEC 7498-1]

3.1.35 DL-service-data-unit [ISO/IEC 7498-1]
3.1.36 DL-simplex-transmission [ISO/IEC 7498-1]
3.1.37 DL-subsystem [ISO/IEC 7498-1]
3.1.38 Systems-management [ISO/IEC 7498-1]
3.1.39 DLS-user-data [ISO/IEC 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-confirmed-facility
3.2.6 DL-facility
3.2.7 DL-local-view
3.2.8 DL-mandatory-facility
3.2.9 DL-non-confirmed-facility
3.2.10 DL-provider-initiated-facility
3.2.11 DL-provider-optional-facility
3.2.12 DL-service-primitive;
primitive
3.2.13 DL-service-provider
3.2.14 DL-service-user
3.2.15 DLS-user-optional-facility
3.2.16 indication (primitive);
acceptor.deliver (primitive)
3.2.17 multi-peer
3.2.18 request (primitive);
requestor.submit (primitive)
3.2.19 requestor
3.2.20 response (primitive);
acceptor.submit (primitive)
3.2.21 submit (primitive)
3.2.22 symmetrical service
– 10 – IEC 61158-3-14:2014 © IEC 2014
3.3 Data-link service terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.3.1
communication macrocycle
set of basic cycles needed for a configured communication activity in a macro network
segment
3.3.2
communication phase
elapsed fraction of a cycle, measured from some fixed origin
3.3.3
communication scheduling
algorithms and operation for data transfers occurring in a deterministic and repeatable
manner
3.3.4
cyclic
repetitive in a regular manner
3.3.5
data DLPDU
DLPDU that carries a DLSDU from a local DLS-user to a remote DLS-user
3.3.6
destination FB Instance
FB instance that receives the specified parameters
3.3.7
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
3.3.8
DLSAP
distinctive point at which DL-services are provided by a single DL-entity to a single higher-
layer entity
Note 1 to entry:  This definition, derived from ISO/IEC 7498-1, is repeated here to facilitate understanding of the
critical distinction between DLSAPs and their DL-addresses.

NOTE 1 DLSAPs and PhSAPs are depicted as ovals spanning the boundary between two adjacent layers.
NOTE 2 DL-addresses are depicted as designating small gaps (points of access) in the DLL portion of a DLSAP.
NOTE 3 A single DL-entity may have multiple DLSAP-addresses and group DL-addresses associated with a
single DLSAP.
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses
3.3.9
DL(SAP)-address
either an individual DLSAP-address, designating a single DLSAP of a single DLS-user, or a
group DL-address potentially designating multiple DLSAPs, each of a single DLS-user
Note 1 to entry:  This terminology is chosen because the term DLSAP-address cannot designate more than a
single DLSAP at a single DLS-user based on ISO/IEC 7498-3.
3.3.10
(individual) DLSAP-address
DL-address that designates only one DLSAP within the extended link
Note 1 to entry:  A single DL-entity may have multiple DLSAP-addresses associated with a single DLSAP.
3.3.11
extended link
DL-subnetwork, consisting of the maximal set of links interconnected by DL-relays, sharing a
single DL-name (DL-address) space, in which any of the connected DL-entities may
communicate, one with another, either directly or with the assistance of one or more of those
intervening DL-relay entities
Note 1 to entry:  An extended link may be composed of just a single link.
3.3.12
FCS error
error that occurs when the computed frame check sequence value after reception of all the
octets in a DLPDU does not match the expected residual

– 12 – IEC 61158-3-14:2014 © IEC 2014
3.3.13
frame
denigrated synonym for DLPDU
3.3.14
group DL-address
DL-address that potentially designates more than one DLSAP within the extended link
Note 1 to entry:  A single DL-entity may have multiple group DL-addresses associated with a single DLSAP.
Note 2 to entry:  A single DL-entity also may have a single group DL-address associated with more than one
DLSAP.
3.3.15
micro segment
part of a network where special scheduling is implemented
3.3.16
multipoint connection
connection from one node to many nodes
Note 1 to entry:  Multipoint connections allow data transfer from a single publisher to be received by many
subscriber nodes.
3.3.17
node
single DL-entity as it appears on one local link
3.3.18
offset
number of octets from a specially designated position
3.3.19
real-time
ability of a system to provide a required result in a bounded time
3.3.20
real-time communication
transfer of data in real-time
3.3.21
real-time Ethernet
RTE
ISO/IEC 8802-3-based network that includes real-time communication
Note 1 to entry:  Other communication can be supported, providing the real-time communication is not
compromised.
Note 2 to entry:  This definition is dedicated, but not limited, to ISO/IEC 8802-3. It could be applicable to other
IEEE 802 specifications, for example IEEE 802.11.
3.3.22
receiving DLS-user
DL-service user that acts as a recipient of DLS-user-data
Note 1 to entry:  A DL-service user can be concurrently both a sending and receiving DLS-user.
3.3.23
schedule
temporal arrangement of a number of related operations

3.3.24
scheduling macrocycle
time interval to implement a specific schedule
3.3.25
sending DLS-user
DL-service user that acts as a source of DLS-user-data
3.3.26
time offset
time difference from a specially designated time
3.4 Symbols and abbreviations
.cnf Confirm primitive
.ind Indication primitive
.req Request primitive
.rsp Response primitive
ARP Address resolution protocol
Cnf Confirmation
CSMA/CD Carrier sense multiple access protocol with collision detection
DHCP Dynamic host configuration protocol
DL- (as a prefix) Data-link-
DLC DL-connection
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
DLPDU DL-protocol-data-unit
DLM DL-management
DLME DL-management entity (the local active instance of DL-management)
DLMS DL-management Service
DLS DL-service
DLSAP DL-service-access-point
– 14 – IEC 61158-3-14:2014 © IEC 2014
DLSDU DL-service-data-unit
ECSME Type 14 communication scheduling management entity
EM_ (as a prefix) Type 14 management
FIFO First-in first-out (queuing method)
FRT Fast Real-time
Ind Indication
IP Internet protocol
LLC Logical link control
LMP Link management protocol
MAC Medium access control
MAU Medium attachment unit
OSI Open Systems Interconnection
PAD Pad (bits)
PDU Protocol data unit
Ph- Physical layer (as a prefix)
PhE Ph-entity (the local active instance of the physical layer)
PhL Ph-layer
QoS Quality of service
Req Request
Rsp Response
RTE Real-time Ethernet
RT-Ethernet Real-time Ethernet
SAP Service access point
SDU Service data unit
SME System management entity
SNTP Simple network time protocol

TCP Transmission control protocol
UDP User datagram protocol
3.5 Common conventions
This standard uses the descriptive conventions given in ISO/IEC 10731.
The service model, service primitives, and time-sequence diagrams used are entirely abstract
descriptions; they do not represent a specification for implementation.
Service primitives, used to represent service user/service provider interactions (see
ISO/IEC 10731), convey parameters that indicate information available in the user/provider
interaction.
This standard uses a tabular format to describe the component parameters of the DLS
primitives. The parameters that apply to each group of DLS primitives are set out in tables
throughout the remainder of this standard. Each table consists of up to six columns,
containing the name of the service parameter, and a column each for those primitives and
parameter-transfer directions used by the DLS:
– the request primitive’s input parameters;
– the request primitive’s output parameters;
– the indication primitive’s output parameters;
– the response primitive’s input parameters; and
– the confirm primitive’s output parameters.
NOTE The request, indication, response and confirm primitives are also known as requestor.submit,
acceptor.deliver, acceptor.submit, and requestor.deliver primitives, respectively (see ISO/IEC 10731).
One parameter (or part of it) is listed in each row of each table. Under the appropriate service
primitive columns, a code is used to specify the type of usage of the parameter on the
primitive and parameter direction specified in the column:
M – parameter is mandatory for the primitive.
U – parameter is a User option, and may or may not be provided depending
on the dynamic usage of the DLS-user. When not provided, a default
value for the parameter is assumed.
C – parameter is conditional upon other parameters or upon the environment
of the DLS-user.
(blank) – parameter is never present.
Some entries are further qualified by items in brackets. These may be
a) a parameter-specific constraint
(=) indicates that the parameter is semantically equivalent to the parameter in the
service primitive to its immediate left in the table;
b) an indication that some note applies to the entry
(n) indicates that the following note n contains additional information pertaining to the
parameter and its use.
– 16 – IEC 61158-3-14:2014 © IEC 2014
In any particular interface, not all parameters need be explicitly stated. Some may be
implicitly associated with the DLSAP at which the primitive is issued.
In the diagrams which illustrate these interfaces, dashed lines indicate cause-and-effect or
time-sequence relationships, and wavy lines indicate that events are roughly
contemporaneous.
4 DL service and concept
4.1 General
4.1.1 DLL architecture
The type 14 DLL is modeled in Figure 2 as an integrated data-link layer with UDP(TCP), IP,
MAC and LLC sublayers defined in ISO/IEC 8802-3 and an extension protocol defined in the
Type 14 parts of the IEC 61158 series, where
a) the Transfer Control Protocol (TCP) defined in RFC 793 is applied;
b) the User Datagram Protocol (UDP) defined in RFC 768 is applied;
c) the Internet Protocol (IP) defined in RFC 791 is applied;
d) the Logic Link Control (LLC) protocol defined in ISO/IEC 8802-3 is applied;
e) the Medium Access Control (MAC) layer protocol defined in ISO/IEC 8802-3 is applied.

Regular ISO/IEC 8802-3
Application layer
FRT applications
RT applications MRT applications
based applications
RFC 768(UDP)/RFC 793 (TCP)
RFC 791 (IP)
Data link layer
DLL extension sublayer
LLC/MAC defined in ISO/IEC 8802-3
Physical layer
ISO/IEC 8802-3 PhL
Figure 2 – Communication model
Additionally, a DLL extension sublayer is defined as the Type 14 Communication Scheduling
Management Entity (ECSME) on ISO/IEC 8802-3 data-link protocol to manage the
deterministic communication and regular communication.
This ECSME provides the following functions:
– transparent data transferring between DLE and DLS_User specified in ISO/IEC 8802-3
without modifying the data;
– receiving DLS_User DATA from DLS_User and buffering them;
– transferring DLS_User DATA to DLE in configured order and priority. The DLE will send it
to Ethernet network using the protocols defined in ISO/IEC 8802-3;
– transferring decoded DLPDU from DLE to DLS_User.
ECSME supports two ways of communication scheduling:
– free competitive communication scheduling based on the CSMA/CD;
– deterministic communication based on the time-sharing scheduling policy defined later.

When the former scheduling is used, ECSME shall directly transfer the data between DLE and
DLS_User without any buffering or handling.
When the latter scheduling is used, the ECSME in each Type 14 device shall transfer
DLS_User DATA to DLE according to the pre-configured timing order and priority, the DLE
shall process the data and send it to PhL, so that the collision is avoided.
ECSME is the extension based on LLC defined in ISO/IEC 8802-3. For normal applications, it
transfers data between DLS_User and LLC without any changing. For FRT applications, it will
insert the optional DL-management tag in DLPDU to implement time-sharing scheduling policy.
ECSME does not alter the services provided by DLL to DLS_User defined in ISO/IEC 8802-3
as well as the interface between PhL and MAC. It only provides the transmission management
of the DLS_User data.
4.1.2 Transaction between DLL and PhL
The transactions between DLL and PhL defined in ISO/IEC 8802-3 are applied without any
changes.
4.2 Services provided by the DLL
The DLL provides connectionless data transfer services and connection-mode data transfer
services defined in ISO/IEC 8802-3, RFC 768, RFC 791 and RFC 793 protocols.
For time synchronization, the services defined in IEC 61588:2009 apply.
For deterministic communication, additional services for scheduling management are defined
based on ISO/IEC 8802-3.
5 DL-management services
5.1 Overview
Clause 5 defines the constraints on the sequence in which the primitives defined in Clause 5
may occur. The constraints determine the order in which primitives occur, but do not fully
specify when they may occur. Other aspects of actual system operation, such as PhL
problems affecting messages in transit, will affect the ability of a DLS-user or a DLS provider
to issue a primitive at any particular time.
5.2 Non-periodic data annunciation
5.2.1 General
This service is defined for a Type 14 device to broadcast all other devices if it has non-
periodic data to be sent at the non-periodic data transferring phase.
When a Type 14 device has non-periodic data (such as alert, alarm, domain download/upload)
to be sent, it shall broadcast the request primitive to all other nodes in the local micro-
segment.
The sequence of primitive of this service is shown in Figure 3.

– 18 – IEC 61158-3-14:2014 © IEC 2014
Receiver
Sender
Request
Indication
DLPDU
Figure 3 – Sequence of non-periodic data annunciation service and end
of non-periodic data annunciation service
5.2.2 Primitives and parameters
Table 1 indicates the primitives and parameters of the non-periodic data annunciation service.
Table 1 – Non-periodic data annunciation primitives and parameters
Parameter name .req .ind
Argument
TYPE M M(=)
IP Header M M(=)
UDP Header M M(=)
NPMA_TAG M M(=)
PRI M M(=)
PAD M M(=)
CRC M M(=)
TYPE
Protocol type, the length of this field is two octets. Its value is 0x88CB.
IP Header
IP header, the length of this field is 20 octets referring to RFC 791, Internet Protocol (IP).
UDP Header
UDP header, the length of this field is 8 octets referring to RFC 768, User Datagram Protocol
(UDP).
NPMA_TAG
NonPeriodicDataAnnunciation PDU identifier, the length of this field is one octet. Its value is
0x20.
PRI
Priority, the length of this field is one octet, the value of this field indicates the priority of the
next non-periodic packet, if the value of this field is equal to 0xFF, it is illustrated that no non-
periodic packet needs to be transmitted.
PAD
Pad octets, the length of this field is 44 octets, all values of this field are set to 0x20.
CRC
Cyclic Redundancy Check value, the length is 4 octets.
5.3 EndofNonPeriodicDataSendingAnnunciation service
5.3.1 General
This service is defined for a Type 14 device to broadcast all other devices that the local non-
periodic data has been sent and other devices can have the chance to access the network at
the non-periodic data transferring phase.
The sequence of primitive of this service is shown in Figure 3.
5.3.2 Primitives and parameters
Table 2 indicates the primitives and parameters of the EndofNonPeriodicDataSending service.
Table 2 – EndofNonPeriodicDataSending service primitives and parameters
Parameter name .req .ind
Argument
TYPE M M(=)
IP Header M M(=)
UDP Header M M(=)
ENPMTA_TAG M M(=)
PRI M M(=)
PAD M M(=)
CRC M M(=)
TYPE
Protocol type, the length of this field is two octets. Its value is 0x88CB.
IP Header
IP header, the length of this field is 20 octets referring to RFC 791, Internet Protocol (IP).
UDP Header
UDP header, the length of this field is 8 octets referring to RFC 768, User Datagram Protocol
(UDP).
– 20 – IEC 61158-3-14:2014 © IEC 2014
ENPMTA_TAG
EndofNonPeriodicDataSending PDU identifier, the length of this field is one octet. Its value is
0x21.
PRI
Priority, the length of this field is one octet, indicating the priority of the unsent non-periodic
packet. The value of 0xFF indicates that no non-periodic packet needs to be transmitted.
PAD
Pad octets, the length of this field is 44 octets, all values of this field are set to 0x20.
CRC
Cyclic Redundancy Check value, the length is 4 octets.
5.4 DL-management for FRT applications
5.4.1 General
For a Type 14 device which is used for FRT applications,
EndofNonperiodicdataSendingAnnunciation service can be omitted. “Non-periodic data
annunciation” can work by using an octet (PRI) in periodic packets instead of an independent
packet. In that case, the device which can send the Nonperiodicdata is managed by the
master device or other DL-management devices.
5.4.2 Primitives and parameters
Table 3 indicates the primitives and parameters of the DL-management service for FRT
applications.
Table 3 – DL-management service primitives and parameters
Parameter name .req .ind
Argument
PRI M M(=)
Reserved M M(=)
IND M M(=)
Timestamp M M(=)
PRI
Priority, the length of this field is one octet. The value of this field indicates the priority of the
next non-periodic packet, if the value of this field is equal to 0xFF, it means that no non-
periodic packet needs to be transmitted.
Reserved
Reserved, the length of this field is three octets, all values of this field are set to 0x20. This
field is reserved.
IND
Indicate, the length of this field is four octets. The value of this field indicates the device
which is allowed by the master device to send non-periodic packets.
Timestamp
Timestamp, the length of this field is eight octets. The value of this field indicates the
timestamp of last DL-management service is sent.

– 22 – IEC 61158-3-14:2014 © IEC 2014
Bibliography
IEC 61158-1, Industrial communication networks – Fieldbus specifications – Part 1: Overview
and guidance for the IEC 61158 and IEC 61784 series
IEC 61158-4-14, Industrial communication networks – Fieldbus specifications – Part 4-14:
Data-link layer protocol specification – Type 14 elements
IEC 61158-5-14, Industrial communication networks – Fieldbus specifications – Part 5-14:
Application layer service definition – Type 14 elements
IEC 61158-6-14, Industrial communication networks – Fieldbus specifications – Part 6-14:
Application layer protocol specification – Type 14 elements
IEC 61784-1, Industrial communication networks – Profiles – Part 1: Fieldbus profiles
IEC 61784-2, Industrial communication networks – Profiles – Part 2: Additional fieldbus
profiles for real-time networks based on ISO/IEC 8802-3
ISO/IEC 646, Information technology – ISO 7-bit coded character set for information
interchange
ISO/IEC 2375, Information technology – Procedure for registration of escape sequences and
coded character sets
ISO/IEC 8824-1, Information technology – Abstract Syntax Notation One (ASN.1):
Specification of basic notation
IEEE 802-2001, IEEE Standard for Local and Metropolitan Area Networks: Overview and
Architecture
RFC 792, Internet Control Message Protocol, available at
RFC 826, An Ethernet Address Resolution Protocol, available at
RFC 919, Broadca
...