If you did not enable DeltaV SIS SLS 1508 Logic Solvers when you installed DeltaV software, enable it now.
Enabling SLS 1508 Logic Solvers changes the DeltaV interface, particularly DeltaV Explorer and Control Studio. In DeltaV Explorer the changes include the addition of the SIS Network, SIS-related Library objects, and Setup additions in SIS Security, SIS Named Sets, and SIS Alarm Types. In Control Studio the changes include the ability to configure SIS modules, templates, and composite blocks.