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Siemens…………………….RDF301, RDF301.50..., RDF600KN, RDF600KN/VB, RDF600KN/S Basic Documentation CE1P3171en
Smart Infrastructure 2020-02-21
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 RDF 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.
Fault transmission is different in LTE Mode and S-Mode:
S
-
Mode
LTE Mode
Fault state Alarm info (error code + internal information)
Fault information (internal
information)
Alarm text (default text can be edited with ACS tool)
The table below shows the error code and default alarm texts.
Thermostat Fault information on bus
Prio Fault Display Error code Default fault text
Text
adjustable *)
-
No fault
---
0
No fault
ü
1 Bus power supply**) BUS,
BUSF
5000 No bus power
supply
---
2 Device address error
Addr
6001 >1 id device address ---
3 Condensation 4930 Condensation in the
room
ü
4 External fault input X1
AL1
9001 Fault input 1 ü
5 External fault input X2
AL2
9002 Fault input 2 ü
6 Clean filter reminder
FIL
3911 Dirty filter ü
*) Default alarm texts are stored in the thermostat’s non-volatile memory and can
be adjusted using the ACS commissioning tool.
**) This error will not be sent on bus (because there is no bus, not enough bus
power supply, bus is overloaded or bus signal is distorted).
· Priority order is #1…6
· External faults #4…5: If faults are active, the display will show AL1, AL2,
alternating. On the bus, only the fault with the highest priority will be sent.
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.
After a timeout of 48 hours, the sending of faults will automatically be enabled
again.
Pri
ority of alarms
Fault transmission