In addition to the available formal Namespace definitions (NSD) provided with IEC standard documents as code components, IEC publishes a web view of the IEC 61850 data model defined in various documents (IEC 61850-7-3, IEC 61850-7-4, etc.). The screen shot below shows the main user interface screen.
The model can be searched by Logical Node, Data Object, Common Data Classes, etc.
This site is available only IEC 61850 working group members.
