SIMATIC WinCC/Redundancy, option for WinCC V7.5 SP2, runtime software, single license. for 2 installations * Contents: 1x USB WinCC Redundancy offers you the option of operating two linked WinCC single-user systems or servers in parallel in order to monitor each other. If one of the two server computers fails, the second server takes control of the entire system. After the failed server returns, the contents of all message and process value archives are copied to the restored server.