IEC 61158-4-4:2019 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 third edition cancels and replaces the second edition published in 2014 and constitutes a technical revision. The main changes include the following significant technical changes with respect to the previous edition:
a) additional user parameters to services;
b) additional services to support distributed objects;c) additional secure services
WITHDRAWN
IEC 61158-4-4:2014 ED2
WITHDRAWN
IEC 61158-4-4:2019 ED3
99.60
Withdrawal effective
Mar 22, 2023
PUBLISHED
IEC 61158-4-4:2023 ED4