Siemens DIGSI is a software tool used for configuring and parameterizing protection devices from Siemens, such as the SIPROTEC 5 and SIPROTEC 4 series. The software provides a user-friendly interface for engineers to design, test, and commission protection schemes. With DIGSI, engineers can configure protection functions, set parameters, and test protection devices to ensure they are functioning correctly.

This guide covers the essentials of — from what it is and its core applications to how you can legally obtain it and install it on your system.

DIGSI 4.91 is a proprietary engineering tool developed by Siemens for managing SIPROTEC 4, SIPROTEC Compact, and Reyrolle protection devices. It provides a unified user interface for all tasks, including device configuration, commissioning, testing, and fault evaluation.

DIGSI 4 is a licensed product. However, Siemens offers a fully functional trial:

If the software fails to connect to a physical SIPROTEC relay:

The exclusive 4.91 package includes an updated catalog of device templates. This ensures immediate recognition of newer hardware revisions within the SIPROTEC 4, SIPROTEC Compact, and Reyrolle device families without requiring manual catalog updates. 3. Enhanced IEC 61850 Station Configurator

Configure settings for SIPROTEC 4, SIPROTEC 3, and SIPROTEC Compact devices from a single project tree.

If DIGSI opens in "Demo Mode," open the standalone application. Click Check Keys to ensure your license is recognized on the local C: drive and has not been corrupted or accidentally moved.

Official downloads and technical documentation are available through the Siemens Industry Online Support (SIOS) portal . While newer versions like are available, older versions like 4.91 are frequently maintained for compatibility with existing SIPROTEC 4 installations.

Enter the necessary licensing information (or select Trial Mode). 3. Install Necessary Device Drivers

If you have an existing DIGSI 4 installation (version 4.60 or higher), you can upgrade directly to 4.91 or 4.92 by running the setup program. However, always back up your projects before performing an upgrade.

Create a verified corporate account (export control validation may apply).

Yes—but only if you pursue the legitimate, exclusive channels. remains an industry workhorse for protection engineers managing legacy SIPROTEC assets. Its stability, comprehensive driver support, and advanced fault analysis capabilities justify the effort to secure an authentic copy.

: Used for managing subnetworks and IP addresses in vendor-neutral station designs.

DIGSI 4.91 introduces refinements over older iterations (like 4.8X), offering better compatibility with modern operating systems and enhanced security protocols. 1. Comprehensive Device Catalog

Back to Top Back to Top