DIN EN 61158-4-7:2008-09

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 Other terms and definitions
  3.4 Symbols and abbreviations
4 Overview of the DL-protocol
  4.1 Overall description of medium allocation
  4.2 Types of entities
  4.3 Addressing
  4.4 Flow control
  4.5 Graphical representation
5 General structure and encoding of PhIDUs and DLPDUs and
  related elements of procedure
  5.1 DLPDU formats and components
  5.2 Description of each DLPDU component
  5.3 PhIDU structure and encoding
  5.4 Common DLPDU structure, encoding and elements of procedure
  5.5 Valid DLPDU types
  5.6 DLL timers
6 DLPDU-specific structure, encoding and element of procedure
  6.1 General
  6.2 Buffer read
  6.3 Buffer write
  6.4 Buffer transfer
  6.5 Specified explicit request
  6.6 Free explicit request
  6.7 Messaging
  6.8 Acknowledged messaging
  6.9 Numbering of acknowledged messages
  6.10 Behavior with mismatched parameters
7 DL-service elements of procedure, interfaces and conformance
  7.1 General
  7.2 Producer/consumer entity
  7.3 Protocol elements by service
  7.4 Bus arbitrator operation
  7.5 Bridges
  7.6 Interfaces
  7.7 Conformance
Annex A (informative) - Exemplary FCS implementation
Annex B (informative) - Object modeling
      B.1 Modeling of the IDENTIFIER object
      B.2 Description of the IDENTIFIER object attributes
      B.3 Modeling of the QUEUE object
      B.4 Description of the QUEUE object attributes
      B.5 Modeling of the BUFFER object
      B.6 Description of the BUFFER object attributes
Annex C (informative) - Topology of multi-segment DL-subnetwork
      C.1 Introduction
      C.2 Global specification
      C.3 Local specification
      C.4 Properties
      C.5 Methods
Annex D (informative) - Management of transmission errors
      D.1 Transmission of RP_DAT_XX
      D.2 Transmission of a free RP_RQ(1/2)
      D.3 Transmission of the specified RP_RQ1
      D.4 Transmission of RP_MSG_NOACK
      D.5 Transmission of RP_MSG_ACK
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.