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 | ✓ |
| 1 | Bus power supply**) |
|
5000 | No bus power supply | --- |
| 2 | Device address error |
|
6001 | >1 id device address | --- |
| 3 | Condensation | 4930 | Condensation in the room | ✓ | |
| 4 | External fault input X1 |
|
9001 | Fault input 1 | ✓ |
| 5 | External fault input X2 |
|
9002 | Fault input 2 | ✓ |
| 6 | Clean filter reminder |
|
3911 | Dirty filter | ✓ |
BUS,
*) 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 of alarms
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.
Fault transmission
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.