6AV6355-1FA00-0DF1 WinCC OA — Driver SINAUT 250 Software Maintenance Service incl. hotline. Allows the application of publicly available patches and upgrades. Duration: 12 months. Must be purchased with corresponding product. Enables the purchase of additional hotline support. Billing takes place annually in advance. Automatic, chargeable extension by 1 year if not terminated 1 month prior to expiration. Hotline support is covered by appropriate SMS of the PowerTag package of the configuration. The SMS conditions apply.