Gira KNX 2139 00 Product Documentation page 52

Valve outputs | Channel-independent functions
Enabling recording of an external largest command value
Optionally, the actuator can evaluate an external telegram for the largest command
value (e.g. from another heating actuator). This allows the cascading of multiple actu-
ators with a command value signal.
The object must be enabled for an external largest command value to be recorded.
￭ Activate the checkbox "Record external largest command value via object".
The "Largest command value - External" object is enabled. The local heating
actuator compares the 1-byte telegram value of this object with its own largest
command value and outputs the largest value via the object "Largest com-
mand value".
￭ Deactivate the checkbox "Record external largest command value via object".
Recording of an external largest command value is not possible. The actuator
independently determines the largest command value of the valve outputs as-
signed to it.
Cyclical telegrams to the "Largest command value - External" object with the
same telegram value cause no reaction.
After a device reset, there is no polling of the current status of the "Largest
command value - External" object. Only when a bus telegram is received does
the actuator take this value into account during evaluation of the largest com-
mand value.
9.3.3.1 Largest command value parameters
Enabling the "Largest command value" function
General valve outputs -> Enabled functions
Largest command value
The actuator can determine the largest constant command value and forward it to
another bus device (e.g. suitable calorific furnaces with integrated KNX control or
visualisation). In the "Yes" setting, the heating actuator evaluates all the active 1-
byte command values of the valve outputs and, optionally, the externally received
largest command value (object "External largest command value") and transmits the
largest command value via the "Largest command value" object.
In the case of valve outputs configured in the ETS to the command value data
formats "Switching (1-bit)" or "Constant (1-byte) with command value limiting value",
there is no evaluation of the command values preset via the bus. Exception: It may
also occur with such command value outputs that a constant command value is act-
ive (e.g. after bus/mains voltage return or a forced position and emergency operation
or manual operation). In this case, this constant command value is also included in
the calculation of the largest command value until the named functions with a higher
priority are exited or a new command value telegram is received via the bus, overrid-
ing the constant command value at the valve output.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Checkbox (yes / no)
Page 52 of 257