Siemens 6AV6355-1AA50-0EF0

WinCC OA V3.20, Redundancy. license for expanding a WinCC OA Server by the option of high availability with bumpless switchover. For a redundant system, both servers require a WinCC OA - redundancy license. For a correct redundant server configuration, both WinCC OA Server licenses must be identical. - - email address for delivery is required.