IEC 61158-4-13:2014

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, symbols, abbreviations
  and conventions
4 Overview of the DL-protocol
5 General structure and encoding of PhPDUs and
  DLPDU and related elements of procedure
6 DLPDU-specific structure, encoding and elements
  of procedure
7 DLE elements of procedure
Bibliography

IEC 61158-4-13:2014 specifies procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed data-link service provider and the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units. This second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes are:
- addition of a new communication class;
- editorial improvements and editorial corrections.