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Valve outputs | Valve output - General
9.4.2 Data formats for command values
The heating actuator receives 1-bit or 1-byte command value telegrams, transmitted,
for example, by KNX room temperature controllers. Usually, the room temperature
controller determines the room temperature and generates the command value tele-
grams using a control algorithm. The actuator controls its valve outputs either in
switching form or with a PWM signal, according to the data format of the command
values and the configuration in the ETS. The cycle time for constant PWM output sig-
nals can be configured separately for each valve output of the heating actuator. This
allows individual adaptation to different actuator types.
It should be noted that the valve outputs do not carry out temperature control
themselves. The actuator converts received command value telegrams or
command value presets (e.g. from the internal room temperature controllers of
the heating actuator) into constant or switching output signals using device
functions.
The "Data format" parameter, which is available separately for each valve output on
the parameter pages "VOx - General", specifies the input format of the command
value objects.
Data format of the command value input "Switching (1-bit)"
In the case of a 1-bit command value, the telegram received via the command value
object is forwarded directly to the appropriate output of the actuator, taking the con-
figured valve direction of action into account. This means that, if an "ON" telegram is
received, the is valve completely opened. The output is then energised for energised
closed valves and the output is deenergised for energised opened valve drives. The
valve is closed completely when an "OFF" telegram is received. The valve output is
then not energised for deenergised closed valves and energised for deenergised
opened valve drives.
In the functions and events listed below, valve outputs configured to the command
value data formats "Switching (1-bit)" are always activated by a constant command
value with pulse width modulation (PWM), provided that command values not equal
to 0% or 100% are to be set...
–
Active forced position,
–
Active emergency operation,
–
After bus voltage return,
–
After an ETS programming operation,
–
During a manual operation.
PWM keeps being executed until the named functions have been exited or, after the
named events, no more lower-level functions are active and a new command value
telegram is received via the bus, overriding the constant command value on the valve
output.
In the named cases, the constant command value is also included in the cal-
culation of the largest command value and that of the heat requirement and
pump control (optional functions).
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 64 of 257
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