This topic assumes that there is an instance of the PIXLClient object called pixl. If this is not the case, please see the Connecting To The PIXL topic.

pixl.PlateLoaded(Bays.Red, "my plate ID", PlateTypes.PlusPlate_96, PlateRoles.Source, string.Empty);

There is no need to treat a plate swap any differently to a plate load - when the PIXL receives a notification that a plate has been loaded in a previously occupied bay it will assume the plate that previously occupied that bay has been removed.