ABB i-bus KNX Product Manual page 43

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ABB i-bus KNX
© 2008 ABB STOTZ-KONTAKT GmbH
Commissioning
Setting force operation
after bus voltage recovery
Options: inactive
switch on by force
Using this parameter the state of forced operation after bus voltage
recovery is parameterised.
•
inactive: The output is enabled after bus voltage recovery and
is no longer subject to forced operation.
If parameterised constant lighting control was activated before
forced operation it will be active.
•
switch on by force: The output is forced operated and switched
with the brightness, which has been parameterised in the
brightness parameter if the object value = 1 (forced switch on).
How does forced operation function?
The active forced operation; irrespective of if it is a 1 bit or 2 bit
recall, has an influence on the overall behaviour of the output.
When the forced operation is recalled, the parameterised
brightness value in the ETS is set. The currently set brightness
value is stored intermediately. A dim command currently operating
or lighting control is interrupted and the target brightness value is
directly saved.
Brightness values received during forced operation are not set,
however they are processed in the background and saved.
Commands and lighting control operating in the background are
also saved. Relative dim commands and dim ramps are ignored.
This also applies for prewarning times at the end of the staircase
lighting function. The target brightness value is saved directly.
With the end of forced operation the brightness value stored in
the background is set. The output returns to the state it was in
before forced operation. If an additional function was active,
e.g. constant lighting control, staircase lighting or slave operation,
this is also active after forced operation. If the Light Controller had
control before forced operation, the lighting control will be
reassumed after forced operation with the switch on brightness.
If the staircase lighting time has not yet timed out it will continue.
The state of the additional function is displayed during forced
operation via the object Status function. Even when the respective
brightness value is not switched to the output during forced
operation.
The actual forced operation is indicated in the second bit of
the status byte (object Status byte).
Forced operation has a higher priority than blocking an output.
•
2 bit control: A 2 bit Forced operation object is enabled. If the Light
Controller receives a telegram with the value 2 or 3 via this object,
the output of the Light Controller is forcibly operated.
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