ABB i-bus KNX Product Manual page 80

ABB i-bus® KNX FUNCTION
When the function Forced operation is active, the output can no longer be operated via other group
objects or manual operation until forced operation has been canceled.
Higher-priority safety functions will continue to run.
A state that is set when forced operation is triggered can be parametrized with 1-bit forced operation. It
can additionally be defined whether activation is to take place via the value 1 or 0.
Two states that are set when forced operation is triggered can be parametrized with 2-bit forced opera-
tion. The first bit activates forced operation. The second bit switches between the two states.
Bit 1
0
0
1
1
Tab. 31: Coding of 2-bit forced operation
The function Forced operation is set in the parameter Forced operation (1 bit / 2 bit).
Travel range limits are not taken into account with forced operation.
When the forced operation is canceled, the blind/shutter is moved to the parameterized Position on can-
cellation of weather alarm, disabling and forced operation and operation is enabled.
Example:
To prevent unexpected movement of the blind/shutter from endangering the cleaning personnel when
they are cleaning the windows, the connected shutters are moved to the upper end position and oper-
ation is disabled. The shutter cannot be moved while the function Forced operation is active.
4.1.3.1.6 Priority of safety functions
The safety functions Wind alarm , Rain alarm , Frost alarm , Disable and Forced operation have priority
over all other functions. If one of these functions is active, operation of the corresponding output is dis-
abled.
In order to control the blind/shutter when several safety functions are active, the order of priority of
safety functions can be defined in the parameter Order of priority of weather alarm, disabling and forced
operation.
Example:
The order of priority defines that Forced operation takes priority over a Wind alarm when windows are
being cleaned. This prevents a movement command due to a Wind alarm from impairing the cleaning
personnel when they are cleaning the slats.
4.1.3.2 Switch Actuator safety functions
4.1.3.2.1 Safety priority
The function Safety priority can be used to protect electrical loads on the switching output or to switch
them in accordance with an installation situation.
Three different safety priorities are available for the Switch Actuator outputs The user can freely select
which (if any) of the safety priorities each output should react to.
Note
Bit 0
0
1
0
1
Note
State of forced operation
Forced operation inactive
Forced operation inactive
Forced operation active, state Off
Forced operation active, state On
Product manual | SAH/S x.x.7.1 | 2CDC505173D0211 Rev. A 80