SIST EN 61158-3-22:2012
(Main)Industrial communication networks - Fieldbus specifications - Part 3-22: Data-link layer service definition - Type 22 elements (IEC 61158-3-22:2010)
Industrial communication networks - Fieldbus specifications - Part 3-22: Data-link layer service definition - Type 22 elements (IEC 61158-3-22:2010)
2012-03-22 - Publication editing allocated to cpalagi@cencenelec.eu
Project handled under parallel procedures as FprEN 61158-300 and split into 5 parts to be published as EN 61158-3-12, 14, 19, 21 and 22.
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-22: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 22-Elemente (IEC 61158-3-22:2010)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-22: Définition des services de couche liaison de données - Eléments de type 22 (CEI 61158-3-22:2010)
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-22. del: Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 22 (IEC 61158-3-22:2010)
Ta del standarda IEC 61158 določa skupne elemente za osnovne časovno kritične sporočilne komunikacije med napravami v avtomatizacijskem okolju. Izraz »časovno kritičen« se uporablja za predstavljanje prisotnosti časovnega okna, v okviru katerega se zahteva dokončanje enega ali več določenih dejanj z določeno stopnjo gotovosti. Zaradi neuspešnega dokončanja določenih dejanj v časovnem oknu je možna odpoved aplikacij, ki zahtevajo dejanja, pri čemer so ogroženi oprema, obrat in morda človeška življenja. Ta standard na abstrakten način določa zunanje vidno opravilo, ki ga zagotavlja nivo podatkovnih povezav procesnih vodil tipa 22 v zvezi z a) primitivnimi dejanji in dogodki opravila; b) parametri, povezanimi z vsakim primitivnim dejanjem in dogodkom, in obliko, ki jo prevzamejo; ter c) medsebojno povezavo med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji. Namen tega standarda je določiti opravila, ki se zagotavljajo za: – aplikacijski nivo procesnih vodil tipa 22 na meji med aplikacijskim nivojem in nivojem podatkovnih povezav referenčnega modela procesnih vodil; – vodenje sistemov na meji med nivojem podatkovnih povezav in vodenje sistemov referenčnega modela procesnih vodil. Specifikacije. Glavni cilj tega standarda je določiti značilnosti konceptualnih opravil nivoja podatkovnih povezav, primernih za časovno kritične komunikacije, ter tako dopolniti osnovni referenčni model OSI pri usmerjanju razvoja protokolov časovnih povezav za časovno kritične komunikacije. Drugotni cilj je zagotoviti načrte prehoda iz predhodno obstoječih industrijskih komunikacijskih protokolov. Ta specifikacija se lahko uporablja kot podlaga za formalne programske vmesnike podatkovne povezave. Vseeno ne gre za formalni programski vmesnik in vsak tak vmesnik mora obravnavati izvedbena vprašanja, ki jih ta specifikacija ne zajema, vključno z: a) velikostmi in oktetnim naročanjem različnih večoktetnih parametrov opravil; in b) korelacijo parnih primitivov za zahtevo in potrjevanje ali navedbo in odziv.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-22. del: Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 22 (IEC 61158-3-22:2010)Industrielle Kommunikationsnetze - Feldbusse - Teil 3-22: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 22-Elemente (IEC 61158-3-22:2010)Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-22: Définition des services de couche liaison de données - Eléments de type 22 (CEI 61158-3-22:2010)Industrial communication networks - Fieldbus specifications - Part 3-22: Data-link layer service definition - Type 22 elements (IEC 61158-3-22:2010)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 61158-3-22:2012SIST EN 61158-3-22:2012en01-julij-2012SIST EN 61158-3-22:2012SLOVENSKI
STANDARD
SIST EN 61158-3-22:2012
EUROPEAN STANDARD EN 61158-3-22 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 61158-3-22:2012 E
ICS 25.040.40; 35.100.20; 35.110
English version
Industrial communication networks -
Fieldbus specifications -
Part 3-22: Data-link layer service definition -
Type 22 elements (IEC 61158-3-22:2010)
Réseaux de communication industriels -
Spécifications des bus de terrain -
Partie 3-22: Définition des services de couche liaison de données -
Eléments de type 22 (CEI 61158-3-22:2010)
Industrielle Kommunikationsnetze -
Feldbusse -
Teil 3-19: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) -
Typ 22-Elemente (IEC 61158-3-22:2010)
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.
SIST EN 61158-3-22:2012
EN 61158-3-22:2012 - 2 -
Foreword The text of document 65C/604/FDIS, future edition 1 of IEC 61158-3-22, 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 61158-3-22:2012.
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
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 61158-3-22:2010 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 61158-4-22:2010 NOTE
Harmonized as EN 61158-4-22:2012 (not modified). SIST EN 61158-3-22:2012
- 3 - EN 61158-3-22:2012
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
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 10731 - Information technology - Open Systems Interconnection - Basic reference model - Conventions for the definition of OSI services - -
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 - -
SIST EN 61158-3-22:2012
SIST EN 61158-3-22:2012
IEC 61158-3-22Edition 1.0 2010-08INTERNATIONAL STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-22: Data-link layer service definition – Type 22 elements
INTERNATIONAL ELECTROTECHNICAL COMMISSION VICS 25.04.40; 35.100.20; 35.110 PRICE CODEISBN 978-2-88912-080-2
® Registered trademark of the International Electrotechnical Commission ® SIST EN 61158-3-22:2012
– 2 – 61158-3-22 © 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.10 3.3 Data-link service terms and definitions.11 3.4 Symbols and abbreviations.13 3.5 Common conventions.15 4 Data-link layer services and concepts.16 4.1 Operating principle.16 4.2 Communication models.16 4.3 Topology.18 4.4 Addressing.19 4.5 Gateway.20 4.6 Interaction models.20 4.7 Synchronization concept.20 5 Communication services.21 5.1 Overview.21 5.2 Communication management services.23 5.3 Cyclic data channel service (CDC).27 5.4 Message channel services (MSC).28 5.5 Time synchronization.29 5.6 Media independent interface (MII) management services.32 Bibliography.34
Figure 1 – RTFL device reference model.17 Figure 2 – RTFN device reference model.18 Figure 3 – Logical double line in a physical tree topology.18 Figure 4 – Logical double line in a physical line topology.19 Figure 5 – Addressing modes.19 Figure 6 – Time sequence diagram for time SYNC_START service.21 Figure 7 – Synchronized timing signals without offset.21 Figure 8 – Synchronized timing signals with offset.21
Table 1 – Summary of DL-services and primitives.22 Table 2 – DL-Network verification service (NV).23 Table 3 – DL-RTFN scan network read service (RTFNSNR).23 Table 4 – DL-RTFN connection establishment DLL service (RTFNCE).24 SIST EN 61158-3-22:2012
61158-3-22 © IEC:2010(E) – 3 – Table 5 – DL-RTFN connection release service (RTFNCR).24 Table 6 – DL-RTFL control service (RTFLCTL).25 Table 7 – DL-RTFL configuration service (RTFLCFG).25 Table 8 – DL-Read configuration data service (RDCD).26 Table 9 – CDC send service (CDCS).27 Table 10 – MSC send service (MSCS).28 Table 11 – MSC send broadcast service (MSCSB).29 Table 12 – MSC read service (MSCR).29 Table 13 – DL-DelayMeasurement start service (DMS).29 Table 14 – DL-DelayMeasurement read service (DMR).30 Table 15 – DL-PCS configuration service (PCSC).30 Table 16 – DL-Sync master configuration service (SYNC_MC).31 Table 17 – DL-Sync start service (SYNC_START).31 Table 18 – DL-Sync stop service (SYNC_STOP).32 Table 19 – DL-MII read service (MIIR).32 Table 20 – DL-MII write service (MIIW).33
SIST EN 61158-3-22:2012
– 4 – 61158-3-22 © IEC:2010(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-22: Data-link layer service definition –
Type 22 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 61158-3-22 has been prepared by subcommittee 65C: Industrial networks, of IEC technical committee 65: Industrial process measurement, control and automation. This standard cancels and replaces IEC/PAS 61158-3-22 published in 2009. This first edition constitutes a technical revision. SIST EN 61158-3-22:2012
61158-3-22 © 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 International Standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the 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 The revision of this standard will be synchronized with the other parts of the IEC 61158 series.
SIST EN 61158-3-22:2012
– 6 – 61158-3-22 © 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.
SIST EN 61158-3-22:2012
61158-3-22 © IEC:2010(E) – 7 – INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-22: Data-link layer service definition –
Type 22 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 22 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 22 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 fulfils the Type 22 data-link layer services defined in this standard. SIST EN 61158-3-22:2012
– 8 – 61158-3-22 © IEC:2010(E) 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 10731, Information technology – Open Systems Interconnection – Basic Reference Model – Conventions for the definition of OSI services 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. 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: DL-address [ISO/IEC 7498-3] called-DL-address [ISO/IEC 7498-3] calling-DL-address [ISO/IEC 7498-3] DL-connection [ISO/IEC 7498-1] DL-connection-end-point [ISO/IEC 7498-1] DL-connection-end-point-identifier [ISO/IEC 7498-1] DL-connection-mode transmission [ISO/IEC 7498-1] DL-connectionless-mode transmission [ISO/IEC 7498-1] correspondent (N)-entities
correspondent DL-entities (N=2)
correspondent Ph-entities (N=1) [ISO/IEC 7498-1] decentralized multi-end-point-connection [ISO/IEC 7498-1] DL-duplex-transmission [ISO/IEC 7498-1] SIST EN 61158-3-22:2012
61158-3-22 © IEC:2010(E) – 9 – (N)-entity
DL-entity (N=2)
Ph-entity (N=1) [ISO/IEC 7498-1] DL-facility [ISO/IEC 7498-1] flow control [ISO/IEC 7498-1] (N)-layer
DL-layer (N=2)
Ph-layer (N=1) [ISO/IEC 7498-1] layer-management [ISO/IEC 7498-1] DL-local-view [ISO/IEC 7498-3] multi-endpoint-connection [ISO/IEC 7498-1] DL-name [ISO/IEC 7498-3] naming-(addressing)-domain [ISO/IEC 7498-3] peer-entities [ISO/IEC 7498-1] primitive name [ISO/IEC 7498-3] DL-protocol [ISO/IEC 7498-1] DL-protocol-connection-identifier [ISO/IEC 7498-1] DL-protocol-data-unit [ISO/IEC 7498-1] DL-relay [ISO/IEC 7498-1] reassembling [ISO/IEC 7498-1] reset [ISO/IEC 7498-1] responding-DL-address [ISO/IEC 7498-3] routing [ISO/IEC 7498-1] segmenting [ISO/IEC 7498-1] (N)-service
DL-service (N=2)
Ph-service (N=1) [ISO/IEC 7498-1] (N)-service-access-point
DL-service-access-point (N=2)
Ph-service-access-point (N=1) [ISO/IEC 7498-1] DL-service-access-point-address [ISO/IEC 7498-3] SIST EN 61158-3-22:2012
– 10 – 61158-3-22 © IEC:2010(E) DL-service-connection-identifier [ISO/IEC 7498-1] DL-service-data-unit [ISO/IEC 7498-1] DL-simplex-transmission [ISO/IEC 7498-1] DL-subsystem [ISO/IEC 7498-1] systems-management [ISO/IEC 7498-1] DL-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: acceptor
asymmetrical service
confirm (primitive);
requestor.deliver (primitive)
deliver (primitive)
DL-confirmed-facility
DL-facility
DL-local-view
DL-mandatory-facility
DL-non-confirmed-facility
DL-provider-initiated-facility
DL-provider-optional-facility
DL-service-primitive;
primitive
DL-service-provider
DL-service-user
DL-user-optional-facility
indication (primitive);
acceptor.deliver (primitive)
multi-peer
request (primitive);
requestor.submit (primitive)
requestor
response (primitive);
acceptor.submit (primitive)
submit (primitive)
symmetrical service
SIST EN 61158-3-22:2012
61158-3-22 © IEC:2010(E) – 11 – 3.3 Data-link service terms and definitions 3.3.1
acyclic data data which is transferred from time to time for dedicated purposes
3.3.2
cell synonym for a single DL-segment which uses RTFL communication model 3.3.3
communication cycle fixed time period between which the root device issues empty frames for cyclic communication initiation in which data is transmitted utilizing CDC and MSC 3.3.4
cycle time duration of a communication cycle 3.3.5
cyclic events which repeat in a regular and repetitive manner
3.3.6
cyclic communication periodic exchange of frames 3.3.7
cyclic data data which is transferred in a regular and repetitive manner for dedicated purposes
3.3.8
cyclic data channel (CDC) one or more frames, which are reserved for cyclic data 3.3.9
data generic term used to refer to any information carried over a fieldbus 3.3.10
device physical entity connected to the fieldbus 3.3.11
DL-segment
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
3.3.12
error discrepancy between a computed, observed or measured value or condition and the specified or theoretically correct value or condition SIST EN 61158-3-22:2012
– 12 – 61158-3-22 © IEC:2010(E) 3.3.13
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 An extended link may be composed of just a single link. 3.3.14
frame denigrated synonym for DLPDU 3.3.15
gateway device acting as a linking element between different protocols 3.3.16
interface shared boundary between two functional units, defined by functional characteristics, signal characteristics, or other characteristics as appropriate 3.3.17
link synonym for DL-segment 3.3.18
logical double line sequence of root device and all ordinary devices processing the communication frame in forward and backward direction 3.3.19
master clock global time base for the PCS mechanism
3.3.20
message ordered sequence of octets intended to convey data 3.3.21
message channel
MSC one or more DPUs (frames), which are reserved for acyclic data 3.3.22
network set of devices connected by some type of communication medium, including any intervening repeaters, bridges, routers and lower-layer gateways 3.3.23
open network any network based on IEC 8802.3
with no further restrictions 3.3.24
ordinary device
OD slave in the communication system, which utilizes RTFL for cyclic and acyclic data interchange with other ODs in the same logical double line SIST EN 61158-3-22:2012
61158-3-22 © IEC:2010(E) – 13 – 3.3.25
precise clock synchronization
PCS mechanism to synchronize clocks of RTFL devices and maintain a global time base 3.3.26
process data data designated to be transferred cyclically or acyclically for the purpose of processing 3.3.27
protocol convention about the data formats, time sequences, and error correction in the data exchange of communication systems 3.3.28
root device
RD master in the communication system, which organises, initiates and controls the RTFL cyclic and acyclic data interchange for one logical double line 3.3.29
real time frame line
RTFL communication model communicating in a logical double line 3.3.30
real time frame network
RTFN communication model communicating in a switched network 3.3.31
switch MAC bridge as defined in IEEE 802.1D 3.3.32
timing signal time-based indication of the occurrence of an event, commonly as an interrupt signal, used for DL-user synchronization 3.3.33
topology physical network architecture with respect to the connection between the stations of the communication system 3.4 Symbols and abbreviations CDC Cyclic data channel CDCS Cyclic data channel send DA Device address DL- Data-link layer (as a prefix) DLL DL-layer DLS DL-service SIST EN 61158-3-22:2012
– 14 – 61158-3-22 © IEC:2010(E) DMR DL-DelayMeasurement read DMS DL-DelayMeasurement send ID Identification IP Internet protocol IRQ Interrupt request MAC Medium access control MII Media independent interface MIIR DL-Media independent interface read MIIW DL-Media independent interface write MSC Message channel MSC
...
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