Generating the Control Value

The Control Value calculated by the controller is initially limited to valid values. 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 it is more usual for the digital output to take the form of 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.