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Siemens
RDU340… Basic Documentation
CE1P3078en
Building Technologies
Functions
2014-11-03
4.7 Control
output
Different control output signals are available depending on the controller type.
Control output
Type reference
on/off
3-position
DC 0…10 V
RDU340
Y21 (1)
--
Y10 (1)
( ) Number of outputs
The demand calculated by the PI control from the current room temperature and
setpoint is provided to the valve actuator as a continuous DC 0...10 V signal via
output Y10.
The electrical heater receives an
ON
command via the auxiliary heating control
output Y21:
1. When the acquired room temperature is below “setpoint for electric heater”.
2. When the electrical heater has been switched off for more than 1 minute.
The
OFF
command for the electrical heater is output:
1. When the acquired room temperature is above the setpoint (electric heater).
2. When the electrical heater has been switched on for more than 1 minute.
A safety thermostat (to prevent overheating) must be provided externally.
Overview of control
output
DC 0...10 V control
signal
Electrical heater
control signal
(2-position)
Caution
