BS EN 61158-4-14:2012

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Industrial communication networks. Fieldbus specifications – Data-link layer protocol specification. Type 14 elements

Published By	Publication Date	Number of Pages
BSI	2012	36

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Description

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

in a synchronously-starting cyclic manner, according to a pre-established schedule, and
in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities.

Thus this protocol can be characterized as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle.

1.2 Specifications

This standard specifies

procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed data-link service provider;
procedures for giving communications opportunities to all participating DL-entities, sequentially and in a cyclic manner for deterministic and synchronized transfer at cyclic intervals;
procedures for giving communication opportunities available for time-critical data transmission together with non-time-critical data transmission without prejudice to the time-critical data transmission;
procedures for giving cyclic and acyclic communication opportunities for time-critical data transmission with prioritized access;
procedures for giving communication opportunities based on standard ISO/ IEC 8802-3 medium access control, with provisions for nodes to be added or removed during normal operation;
the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units.

1.3 Procedures

The procedures are defined in terms of

the interactions between peer DL-entities (DLEs) through the exchange of fieldbus DLPDUs;
the interactions between a DL-service (DLS) provider and a DLS-user in the same system through the exchange of DLS primitives;
the interactions between a DLS-provider and a Ph-service provider in the same system through the exchange of Ph-service primitives.

1.4 Applicability

These procedures are applicable to instances of communication between systems which support time-critical communications services within the data-link layer of the OSI or fieldbus reference models, and which require the ability to interconnect in an open systems interconnection environment.

Profiles provide a simple multi-attribute means of summarizing an implementation’s capabilities, and thus its applicability to various time-critical communications needs.

1.5 Conformance

This standard also specifies conformance requirements for systems implementing these procedures. This standard does not contain tests to demonstrate compliance with such requirements.

PDF Catalog

PDF Pages	PDF Title
6	CONTENTS
8	INTRODUCTION
9	1 Scope 1.1 General 1.2 Specifications 1.3 Procedures
10	1.4 Applicability 1.5 Conformance 2 Normative references 3 Terms, definitions, symbols and abbreviations
11	3.1 Reference model terms and definitions
13	3.2 Service convention terms and definitions 3.3 ISO/IEC 8802-3 terms
14	3.4 Common terms and definitions
15	Figures Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL addresses
17	3.5 Symbols and abbreviations
18	4 Overview of the DL-protocol 4.1 General Figure 2 – Communication model
19	4.2 Services provided by the DL
20	4.3 Structure of deterministic communication scheduling Figure 3 – Type 14 packet identifier Figure 4 – Time-sharing communication scheduling
21	5 Procedure of deterministic communication scheduling 5.1 Overview
22	5.2 State transitions Figure 5 – State transitions of ECSME
24	5.3 State table Tables Table 1 – ECSME state transitions
25	5.4 Function descriptions Table 2 – NonperiodicDataSendingSuc() description Table 3 – NonperiodicDataAnnunciation() description Table 4 – NonperiodicDataSending() description
26	Table 5 – NonperiodicDataSendingSuc() description Table 6 – FirstNonperiodicDataSending() description Table 7 – NonperiodicDataPriority() description
27	Table 8 – NonperiodicDataTimeEnough() description Table 9 – NonperiodicDataSending() description Table 10 – EndOfNonperiodicDataSending() description
28	Table 11 – IsDeviceConfigured() description Table 12 – CountOffsetTime() description Table 13 – DataSendingTiming() description Table 14 – RecEndofNonPeriodicDataSending() description
29	6 Structure and encoding of ECSME PDU 6.1 ECSME PDU structure Figure 6 – Format of NonPeriodicDataAnnunciation PDU
30	Figure 7 – Format of EndofNonPeriodicDataSending PDU Figure 8 – Format of Type 14 PDU Figure 9 – Format of Type 14 PDU for FRT application
31	6.2 Encoding of ECSME packet Table 15 – NonPeriodicDataAnnunciation message encoding
32	Table 16 – EndofNonPeriodicDataSending message encoding Table 17 – Type 14 DL-management Tag encoding
33	Table 18 – Type 14 message encoding Table 19 – Type 14 message for FRT application encoding
34	Bibliography

Additional information

Status	Withdrawn
Title	Industrial communication networks. Fieldbus specifications – Data-link layer protocol specification. Type 14 elements
Replaces	BS EN 61158-4-14:2008
Publisher	BSI
Committee	GEL/65/3
Pages	36
Publication Date	2012-06-30
Withdrawn Date	2014-11-30
Replaced By	BS EN 61158-4-14:2014
ISBN	978 0 580 71547 1
Standard Number	BS EN 61158-4-14:2012
Identical National Standard Of	EN 61158-4-14:2012, IEC 61158-4-14:2010
Descriptors	Interfaces (data processing), Bus networks, Data transmission, Communication procedures, Communication networks, Automatic control systems, Fieldbus, Data link layer (OSI), Process control, Industrial, Computer networks, Open systems interconnection
ICS Codes	35.110 - Networking

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