IEC 61158-4-2:2014 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 third edition cancels and replaces the second edition published in 2010 and constitutes a technical revision. The main changes are:
- Addition of conventions in 3.6;
- Updates of ControlNet object in 7.2;
- Addition of missing V/NV attribute characteristic in 7.5, 7.6, 7.7;
- Extensions and clarifications of TCP/IP interface object in 7.5;
- Extensions and clarifications of Ethernet Link object in 7.6;
- Extensions and clarifications of CCO object in 7.8;
- Extensions and updates of DLR object in 7.9;
- Updates of QoS object in 7.10;
- Addition of Port object in 7.11;
- Updates to DL state machines in 8.1 and 9.2;
- Extensions and updates of DLR protocol in Clause 10;
- Update of indicator behavior in A.2.2 and A.2.3.
