Department 489 is part of the Integrated Power Systems (IPS) Directorate which is responsible for developing the COLUMBIA Class (CLB) state-of-the-art electric drive propulsion system. D489 is responsible for the development and construction support of the electric drive system (drives, controls, and power distribution). In support of electric drive design efforts, D489 is developing a Control Software Test Bed (CSTB) that contains a propulsion system emulator integrated with actual shipboard control hardware/software. The CSTB will be used to support propulsion component software certification and assist in the early discovery/ resolution of propulsion system controls issues. The CSTB emulator hardware runs in real-time to mimic propulsion system performance. The CSTB real-time control logic will use MATLAB/Simulink models to support rapid-prototyping of the propulsion system dynamics.