Combination of the actuator and the it mechanically actuates (Figure S 82) (DIN 19 226).
Starting with an from the control device, the final controlling device intervenes in a mass flow and/or an energy flow of the device to be controlled.
The properties of the final controlling device are described by the entirety of the corresponding properties of its elements (e.g. P behaviour, I behaviour, etc., duration, memory action, amongst others).
Due to their internal structure, final controlling devices are normally much slower than the signal processing of the control device (DIN 19 237).
A differentiation is made between:
- Continuous final controlling devices, which adjust the mass flow and/or energy flow of the device to be controlled constantly within the design range based on an analogue input signal.
- A quasi-continuous final controlling device is present if not all, but a very high number of the mass (energy) flow values are configured for an analogue input signal. They also include final controlling devices which are activated incrementally or binary encoded
- Switching final controlling devices are present if the mass flow (energy flow) is only adjusted in a few stages.
- A final controlling device with memory is present if the device remains in the most recently assumed position as long as the control device does not issue an output signal.
- Final controlling devices with adhesion behaviour are those whose memory does not depend on auxiliary energy.
- A final controlling device without memory assumes a predetermined position in the case of a failure or end of the activation order. This property may be used, for example for safety technical measures (rest position) (according to DIN 19 237).
Figure S 82: Final controlling device