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In compliance with the DIN EN 61158 standard series the layers 1, 2 and 7 of a fieldbus are designed in accordance with ISO/IEC 7498-1. This standard describes layer 2 of Type 21 (RAPIEnet). It defines the data-link layer protocol for Type 21 elements (RAPIEnet). The responsible committee is DKE/K 956 "Feldbus" ("Fieldbus") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.
This document has been replaced by: DIN EN IEC 61158-4-21:2020-08 .