（IEC 61158-4-20-2014），英文名为Industrial communication networks - Fieldbus specifications - Part 4-20: Data-link layer protocol specification - Type 20 elements。
它（IEC 61158-4-20-2014）是在2014-08-15发布，在2014-08-15开始实施。
IEC 61158-4-20:2014 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.
本标准文件共有94页。
IEC 61158-4-20-2014 Industrial communication networks - Fieldbus specifications - Part 4-20_ Data-link layer proto.pdf
(1.86 MB)
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