The Siemens part number 6AV6355-1AA31-7CH1 refers to a WinCC OA V3.17 Para Std REDU license. This is a development and parameterization license for one redundant WinCC OA Server. It includes:

A graphics editor with symbol catalogs

A script development environment

A test framework

To use this license, you’ll need both the WinCC OA Server Basic license and the WinCC OA - Redundancy option. It’s a download-only product, typically used in industrial automation environments where high availability and redundancy are critical. If you're building or expanding a SCADA system with redundancy in mind, this license is a key piece of the puzzle. Want help comparing it with other WinCC OA packages or figuring out how it fits into your setup?