Pi Controller (Continuous); Continuous Control - ABB i-bus KNX Product Manual

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ABB i-bus KNX
Planning and application
12.4.2

PI controller (continuous)

12.4.2.1

Continuous control

With continuous control, a control value is calculated based on the setpoint temperature and the actual
temperature, and is used to optimally set the temperature. The valve is brought to a position corresponding
to the calculated control value. With this method the valve can be fully opened, fully closed and even
positioned in every intermediate position.
Fig. 31: Continuous control
Continuous control is the most precise form of temperature control. At the same time, the positioning
frequency of the valve drive can be kept low. Continuous control can be implemented with the device for
Electromotor 3-Point Valve Drives. This is implemented via 1-byte control.
Note
What is 1-byte control?
For 1-byte control, a value of 0...255 (corresponds to 0%...100 %) is preset by the room thermostat.
The valve is fully closed at 0 % and fully open at 100 %, for example.
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 239