BS EN IEC 61158-3-25:2019

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Industrial communication networks. Fieldbus specifications – Data-link layer service definition. Type 25 elements

Published By	Publication Date	Number of Pages
BSI	2019	30

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Categories: 25.040.40 - Industrial process measurement and control, BSI

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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 International Standard defines in an abstract way the externally visible service provided by the Type 25 fieldbus data-link layer in terms of

the primitive actions and events of the service;
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 document is to define the services provided to

the Type 25 fieldbus application layer at the boundary between the application and datalink 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 document is to specify the characteristics of conceptual datalink 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, and
the correlation of paired request and confirm, or indication and response, primitives.

1.3 Conformance

This document 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 fulfils the Type 25 data-link layer services defined in this document.

PDF Catalog

PDF Pages	PDF Title
2	undefined
5	Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7	CONTENTS
9	FOREWORD
11	INTRODUCTION
12	1 Scope 1.1 General 1.2 Specifications 1.3 Conformance
13	2 Normative references 3 Terms, definitions, symbols, abbreviations and conventions 3.1 Reference model terms and definitions
15	3.2 Service convention terms and definitions 3.3 Terms and definitions
17	3.4 Symbols and abbreviations
18	3.5 Common conventions
19	Figures Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses
20	3.6 Additional Type 25 conventions 4 DL services and concepts 4.1 Overview 4.2 Types of DLS 4.2.1 General 4.2.2 Primitive of the RCL communication and RT communication
21	4.3 Detailed description of the RCL communication service 4.3.1 Sequence of primitives 4.3.2 Transmit / Receive DLSDU Figure 2 – Sequence diagram of RCL communication and RT communication services Tables Table 1 – Primitives and parameters used on the RCL communication service
22	Table 2 – Transmit DLSDU primitives and parameters
23	4.4 Detailed description of the RT communication service 4.4.1 Sequence of primitives 4.4.2 Transmit / Receive DLSDU Table 3 – Primitives and parameters used on the RT communication service Table 4 – Transmit DLSDU primitives and parameters
24	5 DL management services 5.1 General 5.2 Facilities of the DLMS 5.3 Service of the DL-management 5.3.1 Overview 5.3.2 RCL stop
25	5.3.3 RCL start 5.3.4 Node status 5.4 Overview of interactions 5.5 Detail specification of service and interactions 5.5.1 RCL stop Figure 3 – Sequence diagram of DL-management services Table 5 – Transmit DLSDU primitives and parameters
26	5.5.2 RCL start Table 6 – DLM_RCL_STOP primitives and parameters Table 7 – DLM_RCL_START primitives and parameters
27	Table 8 – DLM_RCL_START primitives and parameters
28	Bibliography

Additional information

Status	Definitive
Pages	30
Publication Date	2019-07-02
ISBN	978 0 580 99209 4
Standard Number	BS EN IEC 61158-3-25:2019
Title	Industrial communication networks. Fieldbus specifications – Data-link layer service definition. Type 25 elements
Identical National Standard Of	IEC 61158-3-X Ed.4.0, EN 61158-3-X Ed.4.0
Descriptors	Communication procedures, Communication networks, Open systems interconnection, Data link layer (OSI), Definitions, Bus networks, Fieldbus, Industrial
Publisher	BSI
Committee	GEL/65
ICS Codes	25.040.40 - Industrial process measurement and control

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