Page 172 - Advanced Course

KNX ADVANCED COURSE

the physically measured light level and the either parameterized or via object adjusted
setpoint.

4.6.2 Example
The sensor would – after the initial full application download – send a value of 200. But a
Luxmeter would see 500 Lux. The setpoint of the sensor is also 500 Lux. (It has to be –
otherwise the calibration would be faulty). So after the calibration trigger telegram has
been sent, the new measured value would be returned with “500”.

Only a connection between the controller and the actuator is now missing:

Automatic value control (Master value)

4.6.3 Parameters

Figure 6: Control parameters of the closed loop controller

Explanations:
Operating mode: “Constant light level control” is used for continuous dimming
Number of slaves: Only 1 master channel required, so no slaves = 0
Send meas. brightn.: (optional) the sensor value can be displayed and monitored
Min. variation…: “15 Lux” means, with deviations of equal or more than 15 Lux a new
value will be sent.
Setpoint value: “Parameter” or “Comm. Object”; the latter one allows flexible setting
of the setpoint
Max. var. from setp.: Half of the double sided hysteresis (varies from 15 to 60 Lux)
Max. step size …: varies from 0.5 up to 3%; = difference between 2 master value
telegrams;
Transmit next…: 2 sec; i.e., together with “max. step” 0-100% = 120 sec.

Home and Building Management Systems KNX Association
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