Operating Instructions

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Siemens RXB (KNX) application library RXB Description of functions for FC-10, FC-11, FC-12, FC-13 CM110385en_08
Building Technologies General and central functions 2013-06-17
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 11.2).
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
RXB39.1/FC-13
Appli-
cation
Digital inputs DC 0…10 V
outputs
Outputs
(Relay)
D1
D2
D3
D4
YC1
YC2
YC3
Q14
Q34
FNC02
♦
♦
♦
♦
X
X
X
X
X
FNC03
♦
♦
♦
♦
X X X X X
FNC04
♦
♦
♦
♦
X X X X X
FNC08
♦
♦
♦
♦
X X X X X
Digital inputs
♦
If "Not used" (see page 142), 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 122).
The setting of parameters for unused inputs is described in Section 11.2, page 142.
Key