
Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements (IEC 61158-3-21:2019)
出版:National Standards Authority of Ireland

专家解读视频
This part of IEC 61158 provides the common elements for basic time-critical messaging communications between devices in an automation environment.
IEC 61158-3-21 : 2.0 2019 - Identical
IEC 61158-3-21 : 2.0 2019 - Identical
EN IEC 61158-3-21 : 2019 - Identical