Forced position

The forced position function can also be combined with other functions of a group or single device. With an active forced position, the upstream functions are overridden so that the affected group or device is locked. The forced position function possesses a separate 2-bit communication object. The first bit (bit 0) of the object "Forced position - Activate/Deactivate" indicates whether switch-off or switch-on is forced. If the dimming channel is switched on by force, an ETS parameter defines which brightness value it should be switched on to. The second bit (bit 1) of the object activates or deactivates the restraint. The behaviour at the end of the forced position function can be configured. In addition, the forced object can be initialised after bus or mains voltage return.

Bit coding of forced position
  1. On the parameter page "DALI system... -> Configuration groups -> [x] Group name -> Enabled functions" or "DALI system... -> Configuration Single Devices -> [x] Device Name -> Enables", set the parameter "Disabling function / Forced position" to "Forced position".
  • The forced position is enabled. The communication object "Forced position - Activate/Deactivate" and the parameter of the forced position function become visible.

The parameters for configuring the forced position are available on the parameter page "DALI system... -> Configuration groups -> [x] Group name -> Forced Position" or "DALI system... -> Configuration single devices -> [x] Device name -> Forced position".

A forced position influences only the brightness control of a group or single device. The colour temperature or colour - provided that the groups and single devices have this range of functions - always remains unchanged in a forced position.

With colour-controllable DALI operating devices, the colour is set to the maximum colour value (RGB: #FFFFFF) and, if necessary, additionally to the maximum white value (#FF) in the event of a forced position, but only if the current colour corresponds to the state "#000000" (black) and the optional white value corresponds to "#00". This ensures that manual brightness control via the forced position is recognisable to the user.

  1. Configure the parameter "forced position 'active, switch-on'" to the required behaviour that should be executed if a forced control is activated via the communication object.
  • Preset: The DALI operating devices set themselves to the brightness configured in the "Brightness value" parameter in the event of a restraint.
  • No reaction: The bus operation is locked but the operating devices show no response and remain in the most recently set brightness state.
  • Memory value (brightness before last switch-off): The brightness value is set that was active before the last switch-off and stored internally in the device. This memory value is stored in a non-volatile manner in the gateway so that the value is retained after the bus or mains voltage returns. After an ETS programming operation, the memory value is predefined to "100%". This value is optionally limited by the maximum brightness.
  1. Set the parameter "forced position end 'inactive'" to the required behaviour.
  • At the end of the forced position, the configured behaviour will be executed. Bus operation is enabled again.
  • Track: The state received during the forced position function or the brightness value adjusted before the function can be tracked at the end of the forced position. Any time functions still in progress will also be taken into account if necessary. A scene recall (low priority) is not tracked.
  • No reaction: The operating devices show no response and remain in the brightness state last selected by the forced position.

When tracking forced positions at the end of a manual operation: If a forced position was activated via the KNX before or during a temporary or permanent manual operation, the gateway always executes this higher-priority function for the affected groups and single devices at the end of the manual operation (locking of bus operation). Only in the setting "At end of permanent manual operation = Track outputs" does the gateway carry out the behaviour at the beginning of the forced position again. Bus operation by switching, dimming, value, scene, central is then disabled.

Updates of the forced position object (e. g. "forced position active" to "forced position active" while maintaining the switching status or from "forced position inactive" to "forced position inactive") show no reaction. Exception: If the behaviour is set to "no change" at the end of a manual operation, the gateway tracks active forced positions (locking of bus operation). If a "Forced position active" telegram is received again in this state, the gateway executes the behaviour at the beginning of the forced position again.

The current state of the object of the forced position function will be stored in case of bus or mains voltage failure.

  1. Set the parameter "After bus/mains voltage return" to the required behaviour.
  • After bus or mains voltage return, the configured state is transferred to the "Forced position - Activate/Deactivate" communication object. When a forced position is activated, the group or the single device is immediately activated and interlocked accordingly by forced control after bus/mains voltage return until a forced control takes place via the KNX. In this case, the parameter "After bus voltage return" is not evaluated.
  • State before bus/mains voltage failure: The last existing and internally stored state of the forced position before bus or mains voltage failure will be tracked. An ETS programming operation deletes the stored state (reaction in that case same as with "no forced position active"). If the tracked state corresponds to "No forced position active", the force-independent parameter "After bus voltage return" will be executed on return of bus voltage. If forced position is activated, the DALI operating devices are switched on to the brightness value predefined by the parameter "Forced position 'active, switch-on'".

After programming the application or parameters with the ETS, the forced position function is always deactivated (object value "0").

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