From DeltaV Diagnostics, a user with the Diagnostic Key can initiate a manual switchover, in which the standby assumes the role of active DeltaV OPC Data Access Server. To manually initiate a switchover, select the Application Station with DeltaV OPC Data Access Server, and then click Redundancy Switchover on the Tools menu.
After a switchover event that occurs when the Unattended Workstation Reboot on Failover or Manual Switchover option is disabled, the standby DeltaV OPC Data Access Server will take over as the active DeltaV OPC Data Access Server, but the other DeltaV OPC Data Access Server will not re-establish itself as the standby DeltaV OPC Data Access Server until the Application Station where it runs is restarted. This is true for a manual switchover, as well as for an unplanned switchover. To bring the other DeltaV OPC Data Access Server into error-free, standby status, you must restart the Application Station where the red Error light is flashing in the DeltaV Status window.