
Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements (Endorsed by AENOR in July of 2012.)
出版:

專家解讀視頻
EN 61158-3-21:2012 - Identical
IEC 61158-3-21:2019 - Identical
IEC 61158-3-21:2010 - Identical