FB_DALIV2SmartSPOT

The function block FB_DALIV2SmartSPOT cyclically reads the status of a smartSPOT sensor or MSensor 02 and scales the measured brightness and the detected occupancy from the received value.

Two different cycle times can be specified. One cycle time that is used if no occupancy is detected and one that is used in case of occupancy. In this way access to the DALI bus can be minimized. If occupancy is detected a slower cycle time (e.g. 20 s) can usually be selected, because light control and switching off the lighting is not time-critical. If there is no occupancy, then a shorter cycle time (e.g. 2 s) should be selected. As a result, the lighting is switched on with the shortest possible reaction time when the room is entered.

The measured brightness of the sensor depends on the reflection of the furniture in the room. The measured value is only 20 % to 40 % of the actual brightness of the respective surface. Example: 500 lux on the table with a reflectivity of 30 % results in a brightness value of 150 lux. The measuring range of the sensor is designed so that the usual brightness at the workplace can be controlled from 200 lux to 1000 lux.

If the function block with MSensor 02 is to be used, it must be in slave mode.

Further information and a description of the electrical and physical properties can be found in the product description of the smartSPOT sensor or the MSensor 02.

VAR_INPUT
  bReadDirectly           : BOOL := FALSE;
  tCycleTimeIfOccupancy   : TIME := t#20s;
  tCycleTimeIfNoOccupancy : TIME := t#2s;
  nAddr                   : BYTE := 0;
  eAddrType               : E_DALIV2AddrType := eDALIV2AddrTypeShort;
  eCommandPriority        : E_DALIV2CommandPriority := eDALIV2CommandPriorityMiddle;
END_VAR

VAR_IN_OUT
  stCommandBuffer : ST_DALIV2CommandBuffer;
END_VAR

VAR_OUTPUT
  bOccupancy  : BOOL;
  nBrightness : INT;
  nRawValue   : BYTE;
  bBusy       : BOOL;
  bError      : BOOL;
  nErrorId    : UDINT;
END_VAR