BS EN 61158-3-4:2014

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Industrial communication networks. Fieldbus specifications – Data-link layer service definition. Type 4 elements

Published By	Publication Date	Number of Pages
BSI	2014	30

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Description

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 services provided by the Type 4 fieldbus data-link layer in terms of

the primitive actions and events of the services;
the parameters associated with each primitive action and event, and the form which they take; and
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 4 fieldbus application layer at the boundary between the application and data-link layers of the fieldbus reference model;
systems management at the boundary between the data-link layer and systems management of the fieldbus reference model.

1.2 Specifications

The principal objective of this standard is to specify the characteristics of conceptual data-link layer services suitable for time-critical communications, and thus supplement the OSI Basic Reference Model in guiding the development of data-link protocols for time-critical communications. A secondary objective is to provide migration paths from previously-existing industrial communications protocols.

This specification may be used as the basis for formal DL-Programming-Interfaces. Nevertheless, it is not a formal programming interface, and any such interface will need to address implementation issues not covered by this specification, including

the sizes and octet ordering of various multi-octet service parameters;
the correlation of paired request and confirm, or indication and response, primitives.

1.3 Conformance

This standard does not specify individual implementations or products, nor does it constrain the implementations of data-link entities within industrial automation systems.

There is no conformance of equipment to this data-link layer service definition standard. Instead, conformance is achieved through implementation of the corresponding data-link protocol that fulfills the Type 1 data-link layer services defined in this standard.

PDF Catalog

PDF Pages	PDF Title
4	Foreword Endorsement notice
5	Annex ZA (normative) Normative references to international publications with their corresponding European publications
6	English CONTENTS
8	INTRODUCTION
9	1 Scope 1.1 General 1.2 Specifications 1.3 Conformance
10	2 Normative references 3 Terms, definitions, symbols, abbreviations and conventions 3.1 Reference model terms and definitions
11	3.2 Service convention terms and definitions
12	3.3 Data-link service terms and definitions
14	3.4 Symbols and abbreviations
15	3.5 Conventions
16	4 Data-link service and concepts 4.1 Overview Figures Figure 1 – Relationship of PhE, DLE and DLS-users
17	4.2 Types and classes of data-link service 4.3 Functional classes 4.4 Facilities of the connectionless-mode data-link service 4.5 Model of the connectionless-mode data-link service
18	4.6 Sequence of primitives
19	Figure 2 – Confirmed and unconfirmed Unitdata request time-sequence diagram Figure 3 – Repeated confirmed request time-sequence diagram Tables Table 1 – Summary of DLconnectionless-mode primitives and parameters
20	4.7 Connectionless-mode data transfer functions Figure 4 – State transition diagram for sequences of primitives at one DLSAP Table 2 – Unitdata transfer primitives and parameters
22	5 DLmanagement service 5.1 Scope and inheritance 5.2 Facilities of the DLmanagement service Table 3 – Control-status error codes
23	5.3 Model of the DLmanagement service 5.4 Constraints on sequence of primitives 5.5 Set Figure 5 – Sequence of primitives for the DLM action service Table 4 – Summary of DLmanagement primitives and parameters
24	5.6 Get Table 5 – DLMSet primitive and parameters Table 6 – DLMGet primitive and parameters
25	5.7 Action Table 7 – DLMAction primitive and parameters
26	5.8 Event Table 8 – DLMEvent primitive and parameters
27	Bibliography

Additional information

Status	Withdrawn
Title	Industrial communication networks. Fieldbus specifications – Data-link layer service definition. Type 4 elements
Replaces	BS EN 61158-3-4:2008
Publisher	BSI
Committee	GEL/65/3
Pages	30
Publication Date	2014-10-31
Withdrawn Date	2022-07-29
Replaced By	BS EN IEC 61158-3-4:2019
ISBN	978 0 580 79364 6
Standard Number	BS EN 61158-3-4:2014
Identical National Standard Of	EN 61558-2-12:2011, IEC 61158-3-4:2014, EN 61158-3-4:2014, IEC 61558-2-12:2011
Descriptors	Data transmission, Bus networks, Automatic control systems, Data link layer (OSI), Open systems interconnection, Process control, Interfaces (data processing), Communication networks, Communication procedures, Fieldbus, Computer networks, Industrial
ICS Codes	35.110 - Networking

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