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PR122/VF + PR120/D-M Modbus System Interface

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This document provides the complete Modbus register map and communication protocol for the ABB SACE PR122/VF protection unit with PR120/D-M module, detailing all available data addresses, read/write procedures, and parameter programming. It covers Modbus functions, datalogger configuration, trip history, measures, relay functionality, and command execution conditions for system integration.

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