EN 61158-3-17:2008

INTRODUCTION
1 Scope
2 Normative reference
3 Definitions
  3.1 Terms and definitions
  3.2 Abbreviations and symbols
  3.3 Conventions
4 Overview of the data-link layer service
  4.1 General
  4.2 Overview of network structure
  4.3 Overview of addressing
  4.4 Types of data-link service
5 DLSAP management service
  5.1 Overview
  5.2 Facilities of the DLSAP management service
  5.3 Model of the DLSAP management service
  5.4 Sequence of primitives at one DLSAP
  5.5 Create
  5.6 Delete
  5.7 Bind
  5.8 Unbind
6 Connectionless-mode data-link service
  6.1 Overview
  6.2 Facilities of the connectionless-mode data-link service
  6.3 Model of the data-link service
  6.4 Quality of service
  6.5 Sequence of primitives
  6.6 Connectionless-mode function
  6.7 Types of primitives and parameters
7 DL-management Service
  7.1 Scope and inheritance
  7.2 Facilities of the DL-management service
  7.3 Model of the DL-management service
  7.4 Constraints on sequence of primitives
  7.5 Set
  7.6 Get
  7.7 Action
  7.8 Event
Bibliography
Annex ZA (normative) - Normative references to international
                       publications with their corresponding
                       European publications

It 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. It includes the following significant changes with respect to the previous edition 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.