A two-point controller is a controller that works discontinuously, with two output states. Depending on whether the actual value is above or below the set point, the upper or lower output state is active. Two-point controllers are used when the actuating variable is not a continuous variable, rather it can switch between two states, e.g. On/Off. Though the two-point controller achieves a steady state, it never stops working. With strong changes in the set point it can certainly control quicker than is possible with other control processes.