Data Sheet for Product

Technical Specification Sheet
Document No. 154-116
November 27, 2012
Siemens Industry, Inc.
Page 1 of 2
GAMMA
Dual Sensor for Brightness and Temperature
AP 254/02
Description
The Dual Sensor AP 254/02 sends ambient light level
and outdoor temperature values to the bus.
The sensor is designed for use in the following
applications:
Multi-staged lighting controls
Temperature controls. For example, control of
electric heat for frost protection
Awning/blind/shutter controls
Systems with visualization of light level and
outdoor temperature
The device offers four universal channels (A, B, D, E),
and one solar protection channel (C), which evaluate
the light level and temperature based on their
configured function.
Each universal channel provides the following
threshold switches:
Light level only
Temperature only
Light level and temperature combined
The threshold switches control switching, dimming,
and solar protection actuators based on ambient light
level and/or temperature.
Depending on whether or not the threshold condition is
met, a corresponding telegram is sent to the bus
through the associated channel. If required, a second
object can also be activated to send a second
telegram.
Each universal channel can be deactivated by an
associated blocking object. A brightness threshold may
be set for each channel.
The solar protection channel is used for automatic
control of solar protection equipment. The automatic
control can be started and stopped by an object, such
as sun control, or by a dusk/dawn ambient light level
threshold. Up to three light level thresholds control the
height of the blinds and the angle of the slats. The light
level thresholds may be set by the user during runtime.
The solar protection channel can be deactivated by an
associated blocking object.
Application Program
21 S2 Brightness and Temperature 909712
Send temperature value/brightness value cyclically
and/or on change of value.
Use separate settings for each threshold.
Control up to four shading systems based on
combined temperature and light level values.
Automatic solar protection control based on
dusk/dawn threshold and up to three additional
brightness thresholds.
Use the current light level to set any of the
brightness thresholds.