BS EN 61158-3-7:2008

INTRODUCTION
1 Scope
  1.1 Overview
  1.2 Specifications
  1.3 Conformance
2 Normative references
3 Terms, definitions, symbols, abbreviations and conventions
  3.1 Reference model terms and definitions
  3.2 Service convention terms and definitions
  3.3 Data-link service terms and definitions
  3.4 Symbols and abbreviations
  3.5 Common conventions
4 Data-link layer services and concepts
  4.1 Field of application, object
  4.2 General description of services
  4.3 Sequences of primitives
  4.4 Buffer writing
  4.5 Buffer reading
  4.6 Buffer transfer
  4.7 Explicit request for buffer transfer
  4.8 Unacknowledged message transfer
  4.9 Acknowledged message transfer
Bibliography
Annex ZA (normative) - Normative references to international
                       publications with their corresponding
                       European publications

Describes common elements for basic time-critical messaging communications between devices in an automation environment.

IEC 61158-3-7:2007 defines in an abstract way the externally visible service provided by the Type 7 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;
- the interrelationship between these actions and events, and their valid sequences. This first edition and its companion parts of the IEC 61158-3 subseries cancel and replace IEC 61158-3:2003. This edition of this part constitutes an editorial revision. This edition includes the following changes:
- deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market relevance;
- addition of new types of fieldbuses;
- division of this part into multiple parts numbered 3-1, 3-2,..., 3-19. This bilingual version (2013-07) corresponds to the monolingual English version, published in 2007-12.