Supply Emerson 1X01046H01L Power Supply In typical feedback control systems, the control action to suppress disturbances is generated only after the disturbances have caused certain consequences, leading to the adverse effect of delayed control. To overcome this lagging control drawback, a computer receives the disturbance signal and inserts a feedforward control action before any consequences occur, precisely canceling out the impact of the disturbance on the control variable at the point of disturbance. Hence, it is also known as disturbance compensation control.