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Siemens
Basic Documentation RVP360
CE1P2546en
Building Technologies
4 Acquisition of measured values
2017-07-24
4
Acquisition of measured values
4.1
Room temperature (A6, B5 / A6, B52)
4.1.1 Types of sensors
The following choices are available:
A room sensor QAA24 can be connected to terminal B5/B52. The measuring
range is 0…50 °C
2 room units QAA50.110/101 or QAW70 can be connected to the PPS (point-to-
point interface), terminal A6. The measuring range is 0…32 °C
Acquisition of
room tempera-
ture with …
Connection terminal on
the controller
Addressing
Heating circuit 1 Heating circuit 2
Room sensor QAA24
B5
B52
Not required
Room unit
QAA50.110/101
A6
A6
QAW op. line 51
Room unit QAW70
A6
A6
QAW op. line 51
It is possible to connect 1 room sensor and 1 room unit per heating circuit; the
controller then ascertains the mean value of the 2 measurements, depending on
the setting made. The other room unit functions will not be affected by averaging
4.1.2 Error
handling
In the event of a short-circuit or an interruption of one of the 2 measuring circuits of
a heating circuit, the control responds as follows, depending on the room tempera-
ture source (setting 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/B52 (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, or A6 and B52 (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