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Siemens
Central control unit RMB795B
CE1P3122en
Building Technologies
Inputs
18.01.2012
7.5.3
Outside temperature via bus
The outside temperature can only be provided via the bus if communication is
active and an outside temperature set.
To enable different outside temperatures to be delivered via the bus (e.g. outside
temperature on the northern side of the building for the air conditioning plant, and
outside temperature on the eastern side of the building for heating zone "East",
etc.), they must be assigned to specific outside temperature zones.
Main menu > Commissioning > Communication > Distribution zones
Operating line
Range
Factory setting
Outside temperature
zone
---, 1…31
---
An outside temperature zone identified by "
----"
means that the outside
temperature on the bus is inactive.
7.5.4
Outside temperature simulation
To simulate the outside temperature and test the response of the plant, the
measured value of the outside temperature can be overridden.
Main menu > Inputs
Operating line
Range
Factory setting
Outside temperature
simulation
----,
−
50...
+
50 °C
----
Only authorized staff may override inputs within a limited period of time!
During simulation of the outside temperature, fault status message "Outside sensor
simulation active" will be triggered:
No.
Text
Effect
12 Outs
sensor
simulation active
Non urgent message; must not be
acknowledged.
The fault message remains active until "Simulation outside temp" is returned to "----
". This is to make certain that staff on the plant will not forget to terminate the
simulation.
The simulated outside temperature will only be used locally; it will not be sent via
the bus to other devices.
7.5.5
Troubleshooting
When the Commissioning menu is quit, the central control unit checks if there is a
measured value of the outside temperature. If, at this point in time, a measured
value is available and then missing later, a fault status message will be delivered:
"[...X...]: Sensor error".
Prerequisites
Setting values
Overriding the
measured value
Setting values
Fault status message
Note
Supervision of the
measured value
