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What DIGSI 4.91 Is DIGSI 4.91 is a specific release of the DIGSI 4 family. It provides the user interface, communication drivers, and tools needed to manipulate relay settings, perform binary and parameter downloads to relays, read event and disturbance records, and run simulations. Each release refines compatibility with SIPROTEC relay firmware versions and may introduce updated communication protocols (e.g., IEC 61850, IEC 60870), support for new relay models, and improvements to usability and diagnostics. For engineers and technicians responsible for protection systems, the correct DIGSI release ensures reliable relay management and minimizes configuration mismatches that can lead to misoperation.