UNE-EN IEC 61158-3-21:2019现行
Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements (Endorsed by Asociación Espa?ola de Normalización in August of 2019.)
出版：Asociacion Espanola de Normalizacion
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.
EN IEC 61158-3-21 : 2019 - Identical
IEC 61158-3-21 : 2.0 2019 - Identical
IEC 61158-3-21 : 2.0 2019 - Identical
EN IEC 61158-3-21:2019 - Identical
IEC 61158-3-21:2019 - Identical
