Abstract: A method for controlling a plant assembly includes providing a plant assembly having a first plant including a first sensor that monitors the first plant. The plant assembly further includes a second plant in communication with the first plant. The second plant includes a second sensor that monitors the second plant. The method further includes providing a controller that is adapted to control the plant assembly. An outer control loop of the controller receives a setpoint and a feedback signal, which is provided by the second sensor. A first control output signal is communicated from the outer control loop to an inner control loop of the controller. The inner control loop receives the first control output signal and a feedback signal, which is provided by the first sensor of the first plant. An output signal is provided to the first plant.