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ABB i-bus
EIB / KNX
3.2.4
8-bit scene
3.2.5
Threshold function
© 2004 ABB STOTZ-KONTAKT GmbH
Application and planning
This function can be used for example after a presentation to restore the
lighting to the state it was in beforehand.
Retrieve scene no. <xx>
Short push
button action
Fig. 4: Retrieve scene, 8-bit scene
In the 8-bit scene, the push button gives the actuator the instruction to
retrieve a scene. The scene is not stored in the push button but in the
actuator. All the actuators are addressed via the same group address. A
single telegram is sufficient to retrieve the scene.
A scene number is sent in the telegram value which must match the scene
number in the parameters of the actuator.
After a long push button action (for example), the actuators receive a save
command which causes them to store the current value issued by the
actuator as a new scene value.
Up to 64 different scenes are managed via a single group address. An 8-bit
scene telegram contains the following information:
- Number of the scene (1...64)
- Retrieve scene / store scene
The threshold function monitors a 1-byte or 2-byte value. As soon as this
value exceeds or falls below a threshold value, the output can be switched.
The threshold values can be interpreted as hysteresis values:
Threshold values are hysteresis values
Object "Threshold
value"
Upper threshold
Lower threshold
Output
When the value exceeds the upper threshold or falls below the lower
threshold, the output is switched.
OFF
ON
Actuator 1
Actuator 2
ON
OFF
Actuator 3
ON
OFF
OFF
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