Generating the Control Value

The control value (CV) calculated by the controller is first limited to fall within a valid range. The values of the limits are passed to the controller function block via the control value structure. The control value is made available in three different ways. The control value can be picked up in analog form. However, the more common output is probably the digital output as a pulse width modulated signal. The cycle time required for the pulse width modulation is supplied to the controller in the control value structure. Additionally, a two-point output (for heating or cooling) and a three-point output (for heating and cooling) can be connected.