Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Flow temperature, demand-controlled (basic type C) 03.10.2011
Request input
Main menu > Commissioning > Extra configuration > Operating mode >
Operating line Adjustable values / remarks
Request input ---, N.X1, N.X2, ... (digital and analog values only).
If there is a request at the digital input, the setpoint called for is the value set under
"Setpoints" (section 13.5).
See section 6.6 "Plant operating mode selection via reque
st input (basic type P, C)"
for settings.
Setting "Flow temperature increase max" has no effect; the calculated setpoint is
also shifted by the universal setpoint shift.
A combination of the digital input for devices without communication with other
request signals via communication is possible. The current setpoint then is the
lowest setpoint called for.
13.6.2 Possible hot water request signals
The following request signals can be handled depending on the main control loop:
 Valve position (e.g. from RMU7..B control as basic type A for an air handling
plant with a heating coil) via the bus
 Heat demand in % (e.g. from individual room control "RXB with heating register")
via the bus
 Heat demand in °C (e.g. from a heating controller or apartment control station)
via the bus
 Demand as digital input (see section 6.6 "Plant operating mode selection via
requ
est input (basic type P, C)")
All of these signals can be handled simultaneously.
See section 13.6.1 for a description of the request signal "Valve position in %".
Heat request signal in °C
This requ
est signal can be sent by a heating controller e.g. RMH760 or QAX910.
This signal is used to predefine a heating flow setpoint for the controller. On the
controller, the predefined setpoint can be limited via the settings "Heating flow
temperature setpoint" and "Flow reduction maximum"; universal shift may not be
activated.
If the request signal is only used as a switch-on/switch-off command of the
precontroller, a heating flow setpoint can be predefined; in addition, this setpoint
can be shifted by using the universal shift, and setting value "Flow temperature
reduction max" must be set to "OK".
Configuration