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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 4 Acquisition of measured values 15.03.2011
4 Acquisition of measured values
4.1 Room temperature (A6, B5)
4.1.1 Types of sensors
The following choices are available:
A room sensor QAA24 can be connected to terminal B5. The measuring range is
0…50 °C
A room unit QAW50 or QAW70 can be connected to the PPS (point-to-point in-
terface), terminal A6. The measuring range is 0…32 °C.
One unit can be connected to each of the 2 terminals; in that case, the controller
can ascertain the mean value of the 2 measurements, depending on the setting
made. Averaging has no impact on the other room unit functions
4.1.2 Error handling
In the event of a short-circuit or an interruption of one of the 2 measuring circuits,
the control responds as follows, depending on the room temperature source (set-
ting on operating line 65):
No sensor (operating line 65 = 0):
A short-circuit or an interruption has no impact on the control. An error message
is not delivered
Room unit connected to terminal A6 (operating line 65 = 1):
In the event of a short-circuit or an interruption, the control continues to operate
with the room model, depending on the function. An error message is delivered
Room sensor connected to terminal B5 (operating line 65 = 2):
In the event of a short-circuit or an interruption, the control continues to operate
with the room model, depending on the function. An error message is delivered
Mean value of A6 and B5 (operating line 65 = 3):
In the event of a short-circuit or an interruption of one of the 2 measuring
circuits, the control continues to operate with the correctly working measuring
circuit. An error message is delivered.
In the event of a short-circuit or an interruption of both measuring circuits, the
control continues to operate with the room model, depending on the function.
2 error messages are delivered
Automatic selection (operating line 65 = 4):
Since the controller itself decides how it acquires the room temperature, no error
messages can be delivered
4.1.3 Room model
The controller features a room model. It simulates the progression of the room
temperature. In plants with no acquisition of the room temperature, the room model
can provide certain room functions (e.g. quick setback).
For more detailed information, refer to chapter 9.4.6 "Room model temperature".
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