The Siemens part number 6AV6355-1AA31-7ED0 corresponds to the WinCC OA V3.17 Webserver license. This software option enables the management of multiple connections between WinCC OA Servers and ULC UX Clients (web-based clients).

Here’s what makes it useful:

Supports load balancing when more than one license is used.

Enables multi-level architectures, such as access through a DMZ (Demilitarized Zone).

Ideal for remote access and web-based visualization in SCADA systems.

It’s a download-only product.

This license is especially valuable when you want to extend your SCADA system’s reach securely over the web while maintaining performance and scalability.