The Siemens part number 6AV6355-1AA31-7EG0 corresponds to the WinCC OA V3.17 Secure license. This software option enhances the IT security of a WinCC OA Server by integrating Kerberos-based authentication, which uses a ticket-based system to verify user identities.

Here’s what it brings to the table:

Stronger access control through Kerberos integration

Ideal for environments requiring high cybersecurity standards

Download-only license, like most WinCC OA components

This is especially useful in critical infrastructure or enterprise SCADA systems where secure authentication is a must.