
Industrial communication networks. Fieldbus specifications. Data-link layer service definition. Type 21 elements
出版:British Standards Institution

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