Valve Outputs; Priorities For Valve Outputs - Gira KNX 2139 00 Product Documentation

Valve outputs | Priorities for valve outputs
9

Valve outputs

9.1

Priorities for valve outputs

The heating actuator distinguishes between various functions and events, which
either affect all of some of the assigned valve drives globally, or only specifically af-
fect individual outputs. Because these functions and events cannot be executed sim-
ultaneously, there must be priority control. Each global or output-orientated function
and each incoming event possesses a priority. The function or the event with the
higher priority overrides the lower-priority functions and events.
The following priorities are defined...
– Overload / short-circuit (highest priority)
– Manual operation
– Behaviour after ETS programming
– Response to bus voltage return
– Service mode
– Valve rinsing
– forced position
– Command value limit
– Emergency operation (through cyclical monitoring of the command value)
– Normal operation (activation using command value telegrams)
The behaviour after an ETS programming operation is only executed if there
have been changes in the configuration of the device. If just an application
download is executed with a project design already located in the actuator,
then the actuator will executed the behaviour after bus voltage return.
In manual operation and in service mode, a parameter separately defines the beha-
viour of each of the valve outputs at the end of these functions. The heating actuator
only then executes the configured behaviour if, at the time of enabling, no function
with a lower priority is active. Should a lower-level function be active (e.g. forced pos-
ition), then the actuator will execute the behaviour of this function again.
Special case: A function with a higher priority (e.g. manual operation) is active.
Before this, a function with a lower priority (e.g. service mode) was active. This
function is deactivated whilst the higher-level function remains active. At the
end of the higher-priority function, the state of the outputs should be tracked.
The actuator then evaluates the command value of the lower-level function
and checks how the behaviour is preset or configured here. The actuator then
executes the command value presetting of the lower-level function. If tracking
is also preset or configured for this function, the actuator will still go one layer
lower and evaluate the behaviour configured there.
Example 1: Service mode is active (valve completely opened / 100% com-
mand value). A value of 10% was most recently preset via a command value
telegram (normal operation). No other functions are active. Service mode is
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100 Page 37 of 257