The IEC 60870-5-103 protocol in the IEDs is built on top of the internal IEC 61850 data model. Thus, the IEC 60870-5-103 application data objects and Class 1 events are derived from IEC 61850 data objects and data set reporting. The IEDs have a predefined IEC 61850 data set configuration. In other words, it is predefined which internal data object changes the IEDs detect.
The available IEC 60870-5-103 Class 1 data objects in the IEDs are selected from the objects predefined in the IEC 61850 data sets. IEC 61850 data set reporting and IEC 60870-5-103 Class 1 event reporting are basically identical.
Note: For a list of the available data objects, see the point list manual.