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What are the logical nodes in IEC61850, what are their designators, and how many of each exists?

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

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