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The IEC61850 protocol uses several abbreviations. It is useful to know what these group designator letter means. There are also a set number of each of the logical node groups.
Logical Node Groups Group Designator Number
1. System logical Nodes L 2
2. Protection Functions P 27
3. Protection Related Functions R 10
4. Supervisory Control C 4
5. Generic References G 3
6. Interfacing and Archiving I 4
7. Automatic Control A 4
8. Metering and Measurement M 7
9. Switchgear X 2
10. Instrument Transformer T 2
11. Power Transformer Y 4
12. Further Power System EQUIPMENT Z 14
13. APS_SENSORS S 3
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