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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
General and central functions
28 Feb 2009
HandyTool
Parameter Description
Range
Basic
setting
*137
Reset setpoint offset
0 = Disabled
1 = Enabled
Disabled
11.17 Free inputs/outputs
In a building automation and control system, the free I/Os can be used to interrogate
switch states, for example, or for direct switch control of another device over the
network. However, these functions are not suitable for time-critical processes (<1 s).
Free inputs can be defined as "open" or "closed" (see
If not already in use, the following inputs and outputs can be used freely:
RXB21.1/FC-10
Appli-
cation
Digital inputs
Outputs (Triac)
Outputs
(relay)
D1
D2
Y1
Y2
Y3
Y4
Q24
Q34
FNC02
♦
♦
•
•
FNC04
♦
♦
FNC08
♦
♦
FNC20
♦
♦
X
X
•
•
RXB21.1/FC-11 Appli-
cation
Digital inputs
Outputs (Triac)
Outputs
(relay)
D1
D2
Y1
Y2
Y3
Y4
Q24
Q34
FNC10
♦
♦
X
X
FNC12
♦
♦
X
X
FNC18
♦
♦
∅
1)
∅
1)
2)
{
2)
1)
Heating
surface
valve
2)
Fan-coil
valve
RXB22.1/FC-12 Appli-
cation
Digital inputs
Outputs (Triac)
Outputs (Relay)
D1
D2
Y1 Y2
Q24 Q34 Q44
FNC03
♦
♦
X
FNC05
♦
♦
X
Digital inputs
♦
If "Not used" (see page 126), may be used freely for other
purposes.
Triac outputs
X
Used by the application
•
May be used freely for other purposes
Only freely usable with bus valve actuators
Only freely usable with bus valve actuators
All combinations: see CM110672)
∅
Not freely usable
Relay outputs
X
Used by the application
May be used freely in applications with single-speed or
2-speed fan, (see page 114).
The setting of parameters for unused inputs is described in Section 11.2, page 126.
Key
