device, or it can be a large, complex rack filled with equipment. The DNP Users Group has established four levels of subsets (or profiles) of the protocol for RTU compliance. The DNP Users Group has published IED certification test procedures for Subset Levels 1, 2 and 3, and Controlling Station test procedures that verify a range of functions.

IEEE Standardization

The IEEE adopted DNP3 as on July 23, 2010. IEEE Std 1815 was co-sponsored by the Transmission and Distribution Committee and Substations

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