EN 61158-4-12:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-12. del: Specifikacija protokola na nivoju podatkovnih povezav - Elementi tipa 12 (IEC 61158-4-12:2010)Industrielle Kommunikationsnetze - Feldbusse - Teil 4-12: Protokollspezifikation des Data Link Layer (Sicherungsschicht) - Typ 12-Elemente (IEC 61158-4-12:2010)Réseaux de communication industriels - Spécifications de bus de terrain - Partie 4-12: Spécification du protocole de couche de liaison de données - Eléments de Type 12 (CEI 61158-4-12:2010)Industrial communication networks - Fieldbus specifications - Part 4-12: Data-link layer protocol specification - Type 12 elements (IEC 61158-4-12:2010)35.110OmreževanjeNetworking35.100.20Podatkovni povezovalni slojData link layer25.040.40Merjenje in krmiljenje industrijskih postopkovIndustrial process measurement and controlICS:Ta slovenski standard je istoveten z:EN 61158-4-12:2012SIST EN 61158-4-12:2012en01-julij-2012SIST EN 61158-4-12:2012SLOVENSKI
STANDARDSIST EN 61158-4-12:20081DGRPHãþD

EUROPEAN STANDARD EN 61158-4-12 NORME EUROPÉENNE
EUROPÄISCHE NORM May 2012
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61158-4-12:2012 E
ICS 25.040.40; 35.100.20; 35.110 Supersedes EN 61158-4-12:2008
English version
Industrial communication networks -
Fieldbus specifications -
Part 4-12: Data-link layer protocol specification -
Type 12 elements (IEC 61158-4-12:2010)
Réseaux de communication industriels -
Spécifications de bus de terrain -
Partie 4-12: Spécification du protocole de couche de liaison de données -
Eléments de Type 12 (CEI 61158-4-12:2010)
Industrielle Kommunikationsnetze -
Feldbusse -
Teil 4-12: Protokollspezifikation des Data Link Layer (Sicherungsschicht) -
Typ 12-Elemente (IEC 61158-4-12:2010)
This European Standard was approved by CENELEC on 2012-03-28. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Foreword The text of document 65C/605/FDIS, future edition 2 of IEC 61158-4-12, prepared by SC 65C, "Industrial networks", of IEC/TC 65, "Industrial-process measurement, control and automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61158-4-12:2012.
The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-12-28 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-03-28
This document supersedes EN 61158-4-12:2008. EN 61158-4-12:2012 includes the following significant technical changes with respect to EN 61158-4-12:2008: • bug fixes and • editorial improvements. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
Endorsement notice The text of the International Standard IEC 61158-4-12:2010 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 61131-2 NOTE
Harmonized as EN 61131-2. IEC 61131-3 NOTE
Harmonized as EN 61131-3. IEC/TR 61158-1 NOTE
Harmonized as CLC/TR 61158-1. IEC 61158-5-12:2010 NOTE
Harmonized as EN 61158-5-12:2012 (not modified). IEC 61158-6-12 NOTE
Harmonized as EN 61158-6-12. SIST EN 61158-4-12:2012

- 3 - EN 61158-4-12:2012
Annex ZA (normative)
Normative references to international publications with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 61158-2 2010 Industrial communication networks - Fieldbus specifications -
Part 2: Physical layer specification and service definition EN 61158-2 2010
IEC 61158-3-12 - Industrial communication networks - Fieldbus specifications -
Part 3-12: Data-link layer service definition - Type 12 elements EN 61158-3-12 -
IEC 61588 - Precision clock synchronization protocol for networked measurement and control systems- -
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 2000 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 9899 - Programming languages - C - -
ISO/IEC 10731 - Information technology - Open Systems Interconnection - Basic reference model - Conventions for the definition of OSI services - -
IETF RFC 791 - Internet Protocol - DARPA Internet Program Protocol Specification - -
IETF RFC 768 - User Datagram Protocol - -
IEEE 802.1Q - IEEE Standard for Local and Metropolitan Area Networks - Virtual Bridged Local Area Networks - -
IEC 61158-4-12Edition 2.0 2010-08INTERNATIONAL STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-12: Data-link layer protocol specification – Type 12 elements
INTERNATIONAL ELECTROTECHNICAL COMMISSION XGICS 25.04.40; 35.100.20; 35.110 PRICE CODEISBN 978-2-88912-087-1
– 2 – 61158-4-12 © IEC:2010(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 and abbreviations.11 3.1 Reference model terms and definitions.11 3.2 Service convention terms and definitions.12 3.3 Common terms and definitions.13 3.4 Additional Type 12 definitions.13 3.5 Common symbols and abbreviations.16 3.6 Additional Type 12 symbols and abbreviations.17 3.7 Conventions.18 4 Overview of the DL-protocol.23 4.1 Operating principle.23 4.2 Topology.23 4.3 Frame processing principles.23 4.4 Data-link layer overview.24 4.5 Error detection overview.25 4.6 Node reference model.25 4.7 Operation overview.26 5 Frame structure.27 5.1 Frame coding principles.27 5.2 Data types and encoding rules.27 5.3 DLPDU structure.29 5.4 Type 12 DLPDU structure.32 5.5 Network variable structure.48 5.6 Type 12 mailbox structure.48 6 Attributes.50 6.1 Management.50 6.2 Statistics.66 6.3 Watchdogs.69 6.4 Slave information interface.72 6.5 Media independent interface (MII).77 6.6 Fieldbus memory management unit (FMMU).80 6.7 Sync manager.83 6.8 Distributed clock.89 7 DL-user memory.93 7.1 Overview.93 7.2 Mailbox access type.94 7.3 Buffered access type.97 SIST EN 61158-4-12:2012

61158-4-12 © IEC:2010(E) – 3 – 8 Type 12:
FDL protocol state machines.99 8.1 Overview of slave DL state machines.99 8.2 State machine description.99 Annex A (informative)
Type 12:
Additional specifications on DL-Protocol state machines.107 Bibliography.141
Figure 1 – Type description example.19 Figure 2 – Common structure of specific fields.20 Figure 3 – Frame structure.24 Figure 4 – Mapping of data in a frame.25 Figure 5 – Slave node reference model.26 Figure 6 – Type 12 PDUs embedded in Ethernet frame.27 Figure 7 – Type 12 PDUs embedded in UDP/IP.27 Figure 8 – DL information type description.51 Figure 9 – Address type description.53 Figure 10 – DL control type description.55 Figure 11 – DL status type description.57 Figure 12 – Successful write sequence to DL-user control register.59 Figure 13 – Successful read sequence to the DL-user status register.60 Figure 14 – RX error counter type description.67 Figure 15 – Lost link counter type description.68 Figure 16 – Additional counter type description.69 Figure 17 – Sync configuration type description.70 Figure 18 – Watchdog divider type description.70 Figure 19 – Sync manager watchdog type description.71 Figure 20 – Sync manager watchdog status type description.71 Figure 21 – Watchdog counter type description.72 Figure 22 – Slave information interface access type description.72 Figure 23 – Slave information interface control/status type description.74 Figure 24 – Slave information interface address type description.76 Figure 25 – Slave information interface data type description.77 Figure 26 – MII control/status type description.78 Figure 27 – MII address type description.79 Figure 28 – MII data type description.80 Figure 29 – FMMU mapping example.80 Figure 30 – FMMU entity type description.81 Figure 31 – SyncM mailbox interaction.84 Figure 32 – SyncM buffer allocation.84 Figure 33 – SyncM buffer interaction.85 Figure 34 – Handling of write/read toggle with read mailbox.85 Figure 35 – Sync manager channel type description.87 Figure 36 – Distributed clock local time parameter type description.91 Figure 37 – Successful write sequence to mailbox.94 SIST EN 61158-4-12:2012

– 4 – 61158-4-12 © IEC:2010(E) Figure 38 – Bad write sequence to mailbox.95 Figure 39 – Successful read sequence to mailbox.95 Figure 40 – Bad read sequence to mailbox.96 Figure 41 – Successful write sequence to buffer.97 Figure 42 – Successful read sequence to buffer.98 Figure 43 – Structuring of the protocol machines of an slave.99 Figure 44 – Slave information interface read operation.101 Figure 45 – Slave information interface write operation.102 Figure 46 – Slave information interface reload operation.103 Figure 47 – Distributed clock.105 Figure 48 – Delay measurement sequence.106
Table 1 – PDU element description example.19 Table 2 – Example attribute description.20 Table 3 – State machine description elements.21 Table 4 – Description of state machine elements.22 Table 5 – Conventions used in state machines.22 Table 6 – Transfer Syntax for bit sequences.28 Table 7 – Transfer syntax for data type Unsignedn.28 Table 8 – Transfer syntax for data type Integern.29 Table 9 – Type 12 frame inside an Ethernet frame.30 Table 10 – Type 12 frame inside an UDP PDU.30 Table 11 – Type 12 frame structure containing Type 12 PDUs.31 Table 12 – Type 12 frame structure containing network variables.31 Table 13 – Type 12 frame structure containing mailbox.32 Table 14 – Auto increment physical read (APRD).32 Table 15 – Configured address physical read (FPRD).33 Table 16 – Broadcast read (BRD).34 Table 17 – Logical read (LRD).35 Table 18 – Auto Increment physical write (APWR).37 Table 19 – Configured address physical write (FPWR).38 Table 20 – Broadcast write (BWR).39 Table 21 – Logical write (LWR).40 Table 22 – Auto increment physical read write (APRW).41 Table 23 – Configured address physical read write (FPRW).42 Table 24 – Broadcast read write (BRW).43 Table 25 – Logical read write (LRW).44 Table 26 – Auto increment physical read multiple write (ARMW).46 Table 27 – Configured address physical read multiple write (FRMW).47 Table 28 – Network variable.48 Table 29 – Mailbox.49 Table 30 – Error Reply Service Data.49 Table 31 – DL information.52 SIST EN 61158-4-12:2012

61158-4-12 © IEC:2010(E) – 5 – Table 32 – Configured station address.54 Table 33 – DL control.55 Table 34 – DL status.58 Table 35 – DLS-user specific registers.60 Table 36 – DLS-user event.62 Table 37 – DLS-user event mask.64 Table 38 – External event.65 Table 39 – External event mask.66 Table 40 – RX error counter.67 Table 41 – Lost link counter.68 Table 42 – Additional counter.69 Table 43 – Watchdog divider.70 Table 44 – DLS-user watchdog.70 Table 45 – Sync manager channel watchdog.71 Table 46 – Sync manager watchdog Status.71 Table 47 – Watchdog counter.72 Table 48 – Slave information interface access.72 Table 49 – Slave information interface control/status.75 Table 50 – Actual slave information interface address.76 Table 51 – Actual slave information interface data.77 Table 52 – MII control/status.78 Table 53 – Actual MII address.79 Table 54 – Actual MII data.80 Table 55 – Fieldbus memory management unit (FMMU) entity.82 Table 56 – Fieldbus memory management unit (FMMU).83 Table 57 – Sync manager channel.87 Table 58 – Sync manager Structure.89 Table 59 – Distributed clock local time parameter.92 Table 60 – Distributed clock DLS-user parameter.93 Table A.1 – Primitives issued by DHSM to PSM.107 Table A.2 – Primitives issued by PSM to DHSM.107 Table A.3 – Parameters used with primitives exchanged between DHSM and PSM.107 Table A.4 – Identifier for the octets of a Ethernet frame.108 Table A.5 – DHSM state table.110 Table A.6 – DHSM
function table.125 Table A.7 – Primitives issued by SYSM to DHSM.125 Table A.8 – Primitives issued by DHSM to SYSM.126 Table A.9 – Primitives issued by DL-User to SYSM.126 Table A.10 – Primitives issued by SYSM to DL-User.126 Table A.11 – Parameters used with primitives exchanged between SYSM and DHSM.126 Table A.12 – SYSM state table.128 Table A.13 – SYSM
function table.137 Table A.14 – Primitives issued by RMSM to SYSM.137 SIST EN 61158-4-12:2012

– 6 – 61158-4-12 © IEC:2010(E) Table A.15 – Primitives issued by SYSM to RMSM.138 Table A.16 – Parameters used with primitives exchanged between RMSM and SYSM.138 Table A.17 – RMSM state table.139 Table A.18 – RMSM
function table.140
61158-4-12 © IEC:2010(E) – 7 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 4-12: Data-link layer protocol specification –
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. International Standard IEC 61158-4-12 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:
• bug fixes and
• editorial improvements. SIST EN 61158-4-12:2012

– 8 – 61158-4-12 © IEC:2010(E) The text of this standard is based on the following documents: FDIS Report on voting 65C/605/FDIS 65C/619/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with ISO/IEC Directives, Part 2. A list of all the parts of the IEC 61158 series, published under the general title Industrial communication networks – Fieldbus specifications, can be found on the IEC web site. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
• reconfirmed; • withdrawn; • replaced by a revised edition, or • amended. NOTE The revision of this standard will be synchronized with the other parts of the IEC 61158 series.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.
61158-4-12 © IEC:2010(E) – 9 – INTRODUCTION This part of IEC 61158 is one of a series produced to facilitate the interconnection of automation system components. It is related to other standards in the set as defined by the “three-layer” fieldbus reference model described in IEC/TR 61158-1. The data-link protocol provides the data-link service by making use of the services available from the physical layer. The primary aim of this standard is to provide a set of rules for communication expressed in terms of the procedures to be carried out by peer data-link entities (DLEs) at the time of communication. These rules for communication are intended to provide a sound basis for development in order to serve a variety of purposes: a) as a guide for implementors and designers; b) for use in the testing and procurement of equipment; c) as part of an agreement for the admittance of systems into the open systems environment; d) as a refinement to the understanding of time-critical communications within OSI. This standard is concerned, in particular, with the communication and interworking of sensors, effectors and other automation devices. By using this standard together with other standards positioned within the OSI or fieldbus reference models, otherwise incompatible systems may work together in any combination. NOTE Use of some of the associated protocol types is restricted by their intellectual-property-right holders. In all cases, the commitment to limited release of intellectual-property-rights made by the holders of those rights permits a particular data-link layer protocol type to be used with physical layer and application layer protocols in Type combinations as specified explicitly in the profile parts. Use of the various protocol types in other combinations may require permission from their respective intellectual-property-right holders. The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed that compliance with this document may involve the use of patents concerning Type 12 elements and possibly other types given as follows: EP 1 590 927 B1
[BE] Koppler für ein Netzwerk mit Ringtopologie und ein auf Ethernet basierten Netzwerk EP 1 789 857 B1 [BE] Datenübertragungsverfahren und automatisierungssystem zum Einsatz eines solchen Datenübertragungsverfahrens DE 102007017835.4 [BE] Paketvermittlungsvorrichtung und lokales Kommunikationsnetz mit einer solchen Paketvermittlungsvorrichtung EP 1 456 722 B1 [BE] Datenübertragungsverfahren, serielles Bussystem und Anschalteinheit für einen passiven Busteilnehmer IEC takes no position concerning the evidence, validity and scope of these patent rights. The holder of these patent rights has assured the IEC that he/she is willing to negotiate licences either free of charge or under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of these patent rights is registered with IEC. Information may be obtained from: [BE]: Beckhoff Automation GmbH Eiserstraße 5 33415 Verl,
Germany Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. IEC shall not be held responsible for identifying any or all such patent rights. ISO (www.iso.org/patents) and IEC (http://www.iec.ch/tctools/patent_decl.htm) maintain on-line data bases of patents relevant to their standards. Users are encouraged to consult the data bases for the most up to date information concerning patents. SIST EN 61158-4-12:2012

– 10 – 61158-4-12 © IEC:2010(E) INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 4-12: Data-link layer protocol specification –
Type 12 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, 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 transfer of data and control information from one data-link user entity to one or more user entity; b) the structure of the 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 DL-entities (DLEs) through the exchange of 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 the MAC services of ISO/IEC 8802-3. 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 reference model, 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. SIST EN 61158-4-12:2012

61158-4-12 © IEC:2010(E) – 11 – 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. IEC 61158-2:20101, Industrial communication networks – Fieldbus specifications – Part 2: Physical layer specification and service definition IEC 61158-3-12, Industrial communication networks – Fieldbus specifications – Part 3-12: Data-link layer service definition – Type 12 elements IEC 61588, Precision clock synchronization protocol for networked measurement and control system 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 8802-3:2000, 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 9899, Programming Languages – C ISO/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference Model – Conventions for the definition of OSI services IEEE 802.1Q, IEEE Standard for Local and metropolitan Area Networks – Virtual Bridged Local Area Networks, available at IETF RFC 768, User Datagram Protocol (UDP), available at IETF RFC 791, Internet protocol DARPA internet program protocol specification, available at 3 Terms, definitions, symbols and abbreviations For the purposes of this document, the following terms, definitions, symbols and abbreviations 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-duplex-transmission [ISO/IEC 7498-1]3.1.2 DL-protocol [ISO/IEC 7498-1]___________ 1
To be published SIST EN 61158-4-12:2012

– 12 – 61158-4-12 © IEC:2010(E) 3.1.3 DL-protocol-data-unit [ISO/IEC 7498-1]3.1.4 (N)-entity
DL-entity
Ph-entity [ISO/IEC 7498-1]3.1.5 (N)-interface-data-unit
DL-service-data-unit
(N=2)
Ph-interface-data-unit
(N=1) [ISO/IEC 7498-1]3.1.6 (N)-layer
DL-layer
(N=2)
Ph-layer
(N=1) [ISO/IEC 7498-1]3.1.7 (N)-service
DL-service
(N=2)
Ph-service
(N=1) [ISO/IEC 7498-1]3.1.8 (N)-service-access-point
DL-service-access-point
(N=2)
Ph-service-access-point
(N=1) [ISO/IEC 7498-1]3.1.9 (N)-service-access-point-address
DL-service-access-point-address
(N=2)
Ph-service-access-point-address
(N=1) [ISO/IEC 7498-1]3.1.10 peer-entities [ISO/IEC 7498-1]3.1.11 Ph-interface-data [ISO/IEC 7498-1]3.1.12 primitive name [ISO/IEC 7498-3]3.1.13 reassembling [ISO/IEC 7498-1]3.1.14 recombining [ISO/IEC 7498-1]3.1.15 reset [ISO/IEC 7498-1]3.1.16 routing [ISO/IEC 7498-1]3.1.17 segmenting [ISO/IEC 7498-1]3.1.18 sequencing [ISO/IEC 7498-1]3.1.19 splitting [ISO/IEC 7498-1]3.1.20 systems-management [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 asymmetrical service 3.2.2 confirm (primitive);
requestor.deliver (primitive) 3.2.3 deliver (primitive) 3.2.4 DL-service-primitive;
primitive 3.2.5 DL-service-provider SIST EN 61158-4-12:2012

61158-4-12 © IEC:2010(E) – 13 – 3.2.6 DL-service-user 3.2.7 indication (primitive)
acceptor.deliver (primitive) 3.2.8 request (primitive);
requestor.submit (primitive) 3.2.9 requestor 3.2.10 response (primitive);
acceptor.submit (primitive) 3.2.11 submit (primitive) 3.2.12 symmetrical service 3.3 Common terms and definitions NOTE Many definitions are common to more than one protocol Type; they are not necessarily used by all protocol Types. For the purpose of this part of IEC 61158, the following definitions also apply: 3.3.1
frame denigrated synonym for DLPDU 3.3.2
group DL-address DL-address that potentially designates more than one DLSAP within the extended link. A single DL-entity may have multiple group DL-addresses associated with a single DLSAP. A single DL-entity also may have a single group DL-address associated with more than one DLSAP 3.3.3
node single DL-entity as it appears on one local link 3.3.4
receiving DLS-user DL-service user that acts as a recipient of DLS-user-data NOTE A DL-service user can be concurrently both a sending and receiving DLS-user. 3.3.5
sending DLS-user DL-service user that acts as a source of DLS-user-data 3.4 Additional Type 12 definitions 3.4.1
application function or data structure for which data is consumed or produced [IEC 61158-5:2010] 3.4.2
application objects multiple object classes that manage and provide a run time exchange of messages across the network and within the network device] SIST EN 61158-4-12:2012

– 14 – 61158-4-12 © IEC:2010(E) 3.4.3
basic slave slave device that supports only physical addressing of data 3.4.4
bit unit of information consisting of a 1 or a 0. This is the smallest data unit that can be transmitted 3.4.5
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 3.4.6
connection
logical binding between two application objects within the same or different devices
3.4.7
cyclic
events which repeat in a regular and repetitive manner 3.4.8
Cyclic Redundancy Check
CRC
residual value computed from an array of data and used as a representative signature for the array 3.4.9
data
generic term used to refer to any information carried over a Fieldbus 3.4.10
data consistency
means for coherent transmissio
...