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3.11.8 Fault function on KNX
If a fault occurs (e.g. digital fault input, dew point, communication configuration,
etc.) then a fault will be sent on the bus.
An RDG thermostat listens on the bus and sends its fault when the fault has the
highest alarm priority. This ensures that the management station does not miss any
alarms.
If alarms occur at the same time, the alarm with the highest priority will be first
displayed and sent on the bus.
K NX
Fault transmission is different in LTE mode and S-mode:
R
S-mode
Fault state
Fault information
(internal
information)
LTE mode
Alarm info (error code + internal information)
Alarm text (default text can be edited with ACS700 tool)
The table below shows the error code and default alarm texts.
Prio
Fault
1
No fault
Bus power supply**)
Thermostat
Fault information on bus
Display
Error code
Default fault text
0
5000
No fault
No bus power
supply

---
6001
>1 id device address
---
4930
Condensation in the
room

--bus
Text
adjustable *)
2
Device address error
3
Condensation
4
External fault input X1
AL1
9001
Fault input 1

5
External fault input X2
AL2
9002
Fault input 2

6
External fault input D1
AL3
9003
Fault input 3

7
Clean filter reminder
FIL
3911
Dirty filter

Addr
*)
Default alarm texts are stored in the thermostat’s non-volatile memory and can
be adjusted using the ACS700 commissioning tool
**) This error will not be sent on bus (because there is no bus!)
Priority of alarms
 Priority order is #1…7
 External faults #4…6: If faults are active, the display will show AL1, AL2, AL3,
alternating. On the bus, only the fault with the highest priority will be sent
K NX
A supervisor alarm system may command the thermostat to stop sending faults to
the bus via the communication object “Fault transmission” (disable / enable).
This has no impact on the local display of faults.
R
Fault transmission
After a timeout of 48 hours, the sending of faults will automatically be enabled
again.
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Siemens
Building Technologies
RDG100KN Basic documentation
Functions
CE1P3191en
22 Jun 2010