DIN EN 61158-4-17:2008-09

INTRODUCTION
1 Scope
  1.1 General
  1.2 Specifications
  1.3 Procedures
  1.4 Applicability
  1.5 Conformance
2 Normative reference
3 Definitions
  3.1 Terms and definitions
  3.2 Abbreviations and symbols
  3.3 Conventions
4 Overview of the DL-protocol
  4.1 General
  4.2 Characteristics of the protocol
  4.3 Data-link layer architecture
  4.4 Services provided by the DLL
  4.5 Network sharing with other protocols
5 DLPDU-parameter structure and encoding
  5.1 Overview
  5.2 DLPDU common header format
  5.3 DLPDU body format
6 Local parameters and resources
  6.1 General
  6.2 Parameters and resources related to network structure
  6.3 Parameters and resources to support real-time data transfer
  6.4 Parameters and resources to support the scheduling function
  6.5 Parameters and resources to support the security function
7 DL-service elements of procedure
  7.1 Unacknowledged unitdata transfer service (UUS)
  7.2 Acknowledged unitdata transfer service (AUS)
  7.3 Acknowledged sequence of unitdata transfer service (ASS)
  7.4 Multipoint unitdata transfer service (MUS)
  7.5 Multipoint sequence of unitdata transfer service (MSS)
8 DL-support protocol
  8.1 Transmission scheduling
  8.2 Redundancy
  8.3 DLPDU authentication
Bibliography
Annex ZA (normative) - Normative references to international
                       publications with their corresponding
                       European publications

Gives basic time-critical messaging communications between devices in an automation environment.