An industrial process control with a constraint on a manipulated variable has been studied. For the process the manipulated variable is allowed to vary instantaneously only by a specified amount or less; however, to vary beyond the amount, the rate of change is fixed to prevent another process from being seriously disturbed. To utilize such a manipulated variable for automatic controls without resorting to a multivariable system containing the two processes, a rate limiting filter has been designed. A controller output is fed to the filter first, and then the output of the filter regulates the manipulated variable. This scheme has been applied to a temperature control of a distillation column. The design procedure and the performance of the control system, which includes the filter, have been illustrated.