BS EN 61158-4-21:2012现行
Industrial communication networks. Fieldbus specifications. Data-link layer protocol specification. Type 21 elements
出版：British Standards Institution
专家解读视频
Explains: a) 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; b) procedures for giving communication opportunities based on standard ISO/IEC 8802-3 MAC, with provisions for nodes to be added or removed during normal operation; and c) structure of the fieldbus data link protocol data units (DLPDUs) used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units.
© British Standards Institution 2013
IEC 61158-4-21 Ed. 1.0 - Identical
EN 61158-4-21 : 2012 - Identical
IEC 61158-4-21 : 1.0 - Identical
