I’m using the three Number Sliders to generate the X, Y and Z coordinates. The XYZ Node creates a behind-the-scenes Revit XYZ object, and the the Reference Point creates the visible Revit Reference Point object.
If you select Run Automatically in Dynamo, then the Reference Point in Revit will move as you adjust the Number Sliders in Dynamo.
Link to Dynamo Definition PG 1.1 Reference Point.dyn