ABB Busch-priOn Series Technical Reference Manual page 12

KNX Technical Reference Manual
Busch-priOn
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Planner support for RTC
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Operating modes
The room thermostat has four operating modes:
• Frost protection mode (for heating): The room temperature control is inactive; heating is only carried out when the
temperature in the room drops to the point where the heating system could sustain damage through freezing.
Heat protection mode (for cooling): The room temperature control is inactive; cooling is only carried out when the
temperature has risen to the point where the heat in the room becomes unbearable.
• Comfort mode (for heating and cooling): The setpoint for the room temperature is set to a value that makes the
temperature of the room comfortable during "normal use".
• Standby mode (for heating): The room temperature is reduced to the point where heating costs are saved (e.g. during
temporary absence), but can be quickly raised to comfort temperature again.
Standby mode (for cooling): The room temperature is only raised to the point where energy costs are saved (e.g. during
temporary absence), but can be quickly increased to comfort temperature again.
• Night mode (for heating and cooling): Rooms are not used for longer periods during the night hours; the room temperature
is set a comfortable night-time value and can be quickly raised again to the comfort setpoint in the morning.
A switchover between these operating modes can take place either by means of a switching telegram (parameter "Operating
mode switchover": "1 bit (3x)") or with 1-byte value telegrams (parameter "Operating mode switchover": "1 byte (2x)").
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Operating mode switchover, 1 bit
Frost/heat protection has the highest priority; i.e., switchover to a different mode cannot take place in this case. The
frost/heat protection must first be deactivated; by closing an open window, for example. Night mode has the next highest
priority, followed by comfort mode. If none of these three operating modes are active, the room thermostat is in standby
mode.
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Operating mode switchover, 1 byte
Two 1-byte communication objects are made available with operation mode switchover via 1 byte.
The two 1-byte communication objects have different behaviours for receipt of telegram. One object evaluates received
telegrams as "normal". This means, for example, if a comfort telegram is received, the room thermostat switches to comfort
mode. If a night telegram is received, the room thermostat switches to night mode. This object is controlled, for example, by
time switches.
The second object ("Operating mode switchover OMO") can "overwrite" the first. This means, for example, if a frost/heat
protection telegram is received, the room thermostat switches to frost or heat protection mode. If frost or heat protection is
reset after receipt of a new telegram, the room thermostat activates the mode that is pending on the "normal" object. As a
result, it is capable of memorising operating modes. This object is controlled, for example, by binary inputs that record
information from window contacts.
The following conditions apply for both 1-byte communication objects:
0 = Auto (only for "Operating mode switchover OMO")
1 = Comfort
2 = Standby
3 = Night
4 = Frost/Heat protection
5 – 255 = not allowed
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Temperature measurement
The room thermostat with display can record the temperature via an internal sensor. Additionally, values can be received
from an external sensor or an external temperature sensor via communication objects. The incoming values can be
monitored and, if necessary, adjusted. The functions are explained in greater detail in the following.
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12 | 0073-1-7388 | KNX Technical Reference Manual
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