ABB i-bus KNX Product Manual page 81

ABB i-bus® KNX FUNCTION
Each safety priority has its own group object. The group object and the corresponding safety function
are enabled in the parameter Enable group object "Safety priority x". Safety priority x is active when
• a telegram with the value 1 is received on the group object Safety priority x .
• no telegram is received on the group object Safety priority x within the interval defined in the param-
eter Cyclical monitoring interval (0 = cycl. monitoring deactivated).
If a safety priority occurs, the relay assumes the switching position defined in the parameter Switching
status for safety priority x.
When the corresponding safety priority is canceled, the relay assumes the switching position defined in
the parameter Switching state on cancellation of disabling, forced operation and safety priority.
In case of a safety priority, the output cannot be operated via other group objects, manual operation
or the i-bus® Tool until the safety priority is canceled.
Higher-priority safety functions will continue to run.
If cyclical monitoring of the safety priority is used, the monitoring cycle in the device should be at least
quadruple the cyclical transmission time of the sender (e.g. motion detector, glass breakage sensor).
As a result, the parameterized safety priority will not be triggered immediately if a signal is missing
(e.g. due to high bus load).
4.1.3.2.2 Disable
The function Disable can be used to define a specific switching position for the output and to disable
operation in the parameter Disable. When disabling is canceled, the output's switching position is de-
fined in the parameter Switching state on cancellation of disabling, forced operation and safety priority
and operation is enabled.
As long as disabling is active, the relay switching position cannot be changed via group objects, man-
ual operation or the i-bus® Tool.
Higher-priority safety functions will continue to run.
4.1.3.2.3 Forced operation
The function Forced operation can be used to set the output to a defined state and disable it. 1-bit or 2-
bit forced operation can be used for this purpose.
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. 32: Coding of 2-bit forced operation
Note
Note
Note
Note
Bit 0
0
1
0
1
Product manual | SAH/S x.x.7.1 | 2CDC505173D0211 Rev. A 81
State of forced operation
Forced operation inactive
Forced operation inactive
Forced operation active, state Off
Forced operation active, state On