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Siemens
RXB24.1 – Room controller
CM2N3874en_04
Building Technologies
02 Apr 2010
In the event of a long-term short circuit (approx. 4 minutes) or overload,
the thermal fuse in the transformer may trip.
Subsequently, the device must be exchanged.
There is no protection against accidental connection on the AC 24 V side.
Mains AC 230 V for the supply must be disconnected before plugging and
unplugging the terminal blocks (danger of electric shock!)
If serial wiring is applied on the terminal block 19/21, the connection will
be interrupted if the block is removed from the controller (the jumpers
19-19 and 21-21 are on the PCB, not in the block, see terminal diagrams on
pages 11 and 12).
Technical data
Power supply
Operating voltage
AC 230 V ± 10 %
Rated voltage
AC 230 V
Frequency 50/60
Hz
Power consumption with connected field devices
Max. 12 VA
Internal fuse
Thermal, non-resetting
Operating data
Control algorithm
PI
Inputs
Signal inputs D1, D2
Quantity
2
(for volt-free contacts)
Contact voltage
DC 16 V
Contact current
DC 5 mA
Contact transfer resistance
Max. 100
Contact insulation resistance
Min. 50 k
Switch time:
min. 20ms “ON”, min. 20ms “OFF”
Measured value input B1
Compatible temperature sensors
LG-Ni 1000
Quantity 1
measuring range
0 ... 50 °C
Sensor current
0.5 mA
Resolution 0.1
K
Measuring error at 25 °C sensor temp. (without cable) max. 0.5 K
Outputs
AC24 V triac outputs , Y1 … Y4
Quantity 4
Output voltage
AC 24 V ON/OFF, PWM or 3-position: +/–20%
(May 20% with loads under 2VA)
Output current
Max. 0.5 A
Total nominal load
(at both outputs simultaneously)
Max. 9.5 VA (e.g. 2 thermic actuators, type
STP72E per heating and cooling sequence
Ports/interfaces
Interface to room unit
Number of room units connectable
1
Interface type
for room unit
for ETS3 Professional / ACS
PPS2
KNX / EIB bus
PPS2 baud rate
4.8 kbit/s
Baud rate on KNX / EIB bus
9.6 kbit/s
KNX / EIB bus
Interface type
KNX / EIB (electrically isolated)
Transceiver TP-UART
Bus current
5 mA
Baud rate
9.6 kbit/s
Bus topology
Refer to KNX / EIB manual
(Reference documentation, see next page)