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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
General and central functions
28 Feb 2009
11.15 Alarm
Alarms differ in S-mode and LTE mode.
RXB controllers support different alarms:
•
Room temperature frost If the room temperature or the return temperature in a
fan-coil application drops below the fixed frost protection
limit (5 °C or adjustable for outside air applications), an
alarm is generated.
•
Outside air temperature
frost
In applications with outside air damper, a safety thermo-
stat in the outside air duct can be connected to the digital
input.
•
Overheating alarm
If the digital input of an RXB22.... controller is used as an
overheating alarm (see page 95), the information is
transmitted in this alarm message.
•
Supply air sensor error,
Room sensor error
Sensor fault or short circuit.
•
PPS2 fault
If the PPS2 communication between a controller and the
room unit is interrupted, or the room unit has an internal
fault, the information is transmitted in this alarm
message.
11.15.1 S-mode
In S-mode, the above described alarms are provided as a
common alarm
.
The alarm message is mapped to the following S-mode output communication object:
Common alarm (Output communication object)
Flags
R W C T U
Type Send
heartbeat
States
1 0 1 1 0 1.005
DPT_Alarm
yes
0 = No alarm
1 = Alarm
As soon as the cause of the alarm ceases to exist, the alarm message disappears.
In addition, output
Alarm info
provides more detailed information:
Alarm info (Output communication object)
Flags
R W C T U
Type Send
heartbeat
Info
1 0 1 1 0 219.001
DPT_AlarmInfo
yes
See Konnex specification
Output
Alarm info
can be enabled or disabled via another communication object:
(this influences also the LTE-Mode alarm signal)
Enable alarm info (Input communication object)
Flags
R W C T U
Type Receive
timeout
States
0 1 1 0 0 1.003
DPT_Enable
Ja
(fix 42 hours)
0 = Disabled
1 = Enabled
KNX
R
CO
Note
