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Free Inputs/outputs; 10.15.1 Digital Inputs On The Knx Bus - Siemens Desigo RXB Technical Manual

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RXB24.1/CC-02
Key
K N X
CO
R
Siemens
Building Technologies
10.15

Free inputs/outputs

In a building automation and control system, the free I/Os can be used to e.g. query
switching states 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 NC or NO (see 10.2).
If not already in use, the following inputs and outputs can be used freely:
Appli-
Digital inputs
cation
D1
D2
CLC01
1
2
CLC02
3
4
RAD01
5
6
Digital inputs
7
Triac outputs
X
• Only freely usable with bus valve actuators.
Parameter setting for free inputs see 10.2, page 102.

10.15.1 Digital inputs on the KNX bus

RXB... Room controller
D1
D2
The following S-mode input and output communication objects are used when taking
advantage of spare inputs and outputs:
Digital input 1 (output communication object)
Digital input 2 (output communication object)
Flags
Type
R W C T U
1.001
1 0 1 1 0
DPT_Switch
Parameter setting in tool
Free: Bus = 1 = Contact closed
Free: Bus = 1 = Contact open
RXB (KNX) Applications library
General / central functions
Triac outputs
Y1
Y2
Y3
If "Not used" (see page 102), can be used freely.
Used by the application.
Can be used freely.
(All combinations: see CM110671).
Digital input 1
Digital input 2
Send heartbeat States
0
No
1
Cause: digital input
Contact closed
Contact open
Contact open
Contact closed
CLC and RAD description of functions for CC-02 CM110384en_03
Y4
10385Z19en
(see 10.2)
Effect: bus output
1
0
1
0
28 Feb 2009
111/140

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