BS EN 61158-4-18:2012

INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, symbols, abbreviations and
  conventions
4 DL-protocol overview
5 DLPDU encoding and transmission
6 DLPDU - basic structure
7 DLPDU - Detailed structure, segmenting and reassembly
8 Data transmission methods
9 DL-management - procedures
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

Describes 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.

IEC 61158-4-18:2010 specifies the protocol which provides communication opportunities to all participating data-link entities in a synchronously-starting cyclic manner, according to a pre-established schedule, and in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities. The described procedures are applicable to instances of communication between systems which support time-critical communications services within the data-link layer of the OSI or fieldbus reference models, and which require the ability to interconnect in an open systems interconnection environment. Profiles provide a simple multi-attribute means of summarizing an implementation\'s capabilities, and thus its applicability to various time-critical communications needs. This bilingual version (2012-08) corresponds to the monolingual English version, published in 2010-08. This second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes with respect to the previous edition are: Editorial improvements and Addition of cyclic data segmenting.