ABB i-bus KNX FCA/S 1.1M Product Manual page 145

ABB i-bus KNX Planning and application
An example of this is when the FCA/S receives a 1 byte control value
(continuous control) as an input signal, and this value together with the
parameterised cycle time from a PWM calculation is converted into a signal
for a 2-point control (ON-OFF value).
With PWM control, the received control value (0...100 %) calculated in the
control algorithm is converted to a pulse width modulation.
The conversion is based on a constant cycle time. If the FCA/S for example,
receives a control value of 20 %, then for a cycle time of 15 minutes the
valve will be opened for three minutes (20 % of 15 minutes) and closed for
12 minutes (80 % of 15 minutes).
© 2010 ABB STOTZ-KONTAKT GmbH 143