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ABB i-bus
KNX
Planning and application
4.3.4
Bus voltage failure
After the contact positions have set when the bus voltage fails, the device remains functional until the bus
voltage recovers.
Note
The values of group objects Logical connection 1/2 are stored on bus voltage failure. The values are set
again after bus voltage recovery.
If values are not assigned for these group objects Logical Connection 1/2 they will be deactivated.
On reset via the bus, the values of group objects Logical Connection 1/2 remain unchanged.
Only the energy for an instant switching action for each output is available should the bus voltage fail.
Blind
The reaction of the blind/shutter output is parametrizable. The output can assume any state or remain
unchanged.
Note
The position of the blind or shutter is also stored in the event of bus voltage failure if the Automatic
function is activated. The blind or shutter remains in the same position.
On bus voltage recovery, the position is retained and the group object value is undefined. The value is
not updated until the next Move telegram.
If the Activation of autom. control group object has not been assigned a group address, the Automatic
function is deactivated when there is a download.
If Automatic is active, it remains on after a download until the next manual override or until it is
deactivated by the Activation of autom. control group object.
JRA/S 6.230.3.1 | 2CDC506083D0201 139
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