Brightness sensor with constant light level controller UP 255D21

for measuring the brightness on an illuminated working surface by measuring the reflected light, 
for a measuring range of 0...2.000 lux (with a reflection degree for the illuminated surface of approx. 30%), 
with monitoring range horizontal 360°, vertical approx. 40°,
with mixed light measurement (daylight and artificial light),
for measuring the brightness in a range of diameter 2 m (depending on installation height  / room height),
with cyclical sending or sending on change of value of the measured brightness value (Lux),
with integrated two-point control,
with constant light level control for a main group of luminaries and up to four additional groups of luminaries
with selectable power on value at beginning of constant light level control,
with automatic calibration of up to four sub luminaries groups,
with light control configurable as fully automatic or semi-automatic,
with automatic deactivation of the constant light level control through manual bright/dark dimming or dimming to a preset dimming value, 
with integrated IR receiver and IR decoder for IR remote controls with six pairs of pushbuttons,
with functions of the IR remote control selectable per pair of pushbuttons or per each single pushbutton of a button pair,
with per pushbutton selectable function toggle, switching on, switching off, 8-bit scene recall, 8-bit value, 16-bit value, temperature value, brightness value,
with for each pair of pushbuttons selectable function switching On/Off, 2-button dimming with stop telegram, 2-button solar protection control, variable 8-bit value, 8-bit scene control,
with blocking object for IR decoder, parameterized with ETS,
with adjustable behavior of the brightness sensor on bus voltage recovery,
Programming mode can be activated via IR remote control in factory setting mode or with programming button
with power supply over the bus line,
with programming button reachable from front,
with integrated bus coupling unit,
bus connection via bus terminal,

dimension: for ceiling mounting on a flush-mounting box with 60 mm diameter and min. 40 mm depth or in a housing for surface-mounting (to be ordered separately)

Manufacturer: Siemens
order no.: 5WG1 255-2DB21