Changeover Via Analog Input - Siemens RXB Series Basic Documentation

Changeover source
analog input AI
Note
T
Flow
Return
For internal use only
Siemens
Building Technologies
9.2.2

Changeover via analog input

The outside temperature sensor is wired to universal input "x" (configured as
analog input) of the "H/C changeover" function block in controller 1 (RMU7x0B).
The release relay in controller 1 acts on heating/refrigeration generation. The
heating/cooling changeover signal acts on all controllers (here, controllers 1 and 2)
in the same heating/refrigeration distribution zone.
If an analog signal is the source of the H/C changeover, two limit values must be
selected for changeover. For further information see basic documentation, manual
P3150.
Htg/ClgCoil 1
1
M
1
Heat/refrig distribution zone 1
T
AI
x
1
H/C changeover
Q
x
2
H/C changeover
Q
KNX bus communications
Appendix
T
KNX
H/C changeover signal
x
Supervision Controller
1 2 3
S1 S1 S1
Heat demand
S2
S2 S2
S3
23
Q d Y
x
Supervision Controller
1 2 3
S1 S1 S1
Heat demand
S2
S2 S2
S3
23
Q d Y
Htg/ClgCoil 2
2
M
2
x
Controller
Supervision
1 2 3
S4 S4 S4
Refrig demand
Kältebedarf
S5
d
Q Y
x
Controller
Supervision
1 2 3
S4 S4 S4
Refrig demand
Kältebedarf
S5
d
Q Y
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2013-04-08