1. Apparatus for configuring a control system, comprising A. a model comprising one or more objects representing one or more devices of a control system, B. at least one of the objects representing at least one device (“bus master”) that defines and/or controls communications on at least a portion of a network (“segment”) over which at least one of the devices communicates, the at least one object including information defining a configuration of the segment, C. a download service that is coupled to the model and to the control system and that transfers to the control system at least selected configuration information from objects in the model, D. a change tracking system that is in communications coupling with the download service, E. the download service transferring to the bus master communications configuration information for the segment and wherein a track attribute of the object indicates whether the object reports its downloading to the device in the control system.