DIN EN 61158-4-8:2008-09

INTRODUCTION
1 Scope
  1.1 General
  1.2 Specifications
  1.3 Procedures
  1.4 Applicability
  1.5 Conformance
2 Normative references
3 Terms, definitions, symbols and abbreviations
  3.1 Reference model terms and definitions
  3.2 Service convention terms and definitions
  3.3 Common terms and definitions
  3.4 Additional Type 8 definitions
  3.5 Symbols and abbreviations
4 DL-protocol
  4.1 Overview
  4.2 DL-service Interface (DLI)
  4.3 Peripherals data link (PDL)
  4.4 Basic Link Layer (BLL)
  4.5 Medium Access Control (MAC)
  4.6 Peripherals network management for layer 2 (PNM2)
  4.7 Parameters and monitoring times of the DLL
Annex A (informative) - Implementation possibilities of
                        definite PNM2 functions
      A.1 Acquiring the current configuration
      A.2 Comparing the acquired and stored configurations
          prior to a DL-subnetwork error
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.