Type: Floating Point, Input Default Value: 1.0 Description: Time constant for controlled variable response

The time constant is a tuning parameter for the speed of response of a reference trajectory. When the set point is stepped to a new value, the time constant (*TAU*) adjusts the speed of response with

$$SP_{tr} = \left(1-\exp{\left(-\frac{t}{TAU}\right)}\right) (SP_{new} - SP_{old}) + SP_{old}$$

where *SP _{old}* is the prior set point,