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Valve outputs | Cyclical command value monitoring / emergency
operation
Object no.
21, 36, 51,
66, 81, 96
1-byte input object for the presetting of a constant command value, e.g. of a KNX
room temperature controller (0...100% -> 0...255). This object is only available for
valve outputs configured in the ETS to the command value data formats "Constant
(1-bit) with pulse width modulation (PWM)" or "Constant (1-byte) with command
value limiting value". With the command value format "Constant (1-byte) with pulse
width modulation (PWM)", the telegram value is implemented by the actuator with an
equivalent pulse-width-modulated switch signal at the valve outputs. The duty factor
is adapted constantly by the actuator, depending on the command value received.
The cycle time can be configured in the ETS. In accordance with the configured
valve direction of action, the output is either energised or deenergised, depending on
the valve position to be approached. In so doing, the duty factor is inverted automat-
ically for a deenergised opened drive.
In the command value format "Constant (1-byte) with command value limiting value",
the received constant command value is converted into a switching output signal,
depending on a configured limiting value. The valve drive opens when the command
value reaches the limiting value or exceeds it. A hysteresis is also evaluated to pre-
vent constant closing and opening of the actuator for command values in the area of
the limiting value. The valve drive only closes when the command value undershoots
the limiting value minus the configured hysteresis. The conversion of the constant in-
put signal into a switching command value takes place internally in the device. Dur-
ing processing, the actuator evaluates the converted command value as if it were a
received 1-bit command value. It forwards the status directly to the appropriate out-
put, taking the configured valve direction of action into account.
9.5
Cyclical command value monitoring / emergency operation
If necessary, cyclical monitoring of the command values can be performed. If, during
active cyclical monitoring, there are no command value telegrams during a preset
time, then emergency operation is activated for the affected valve output, for which a
configurable constant PWM command value can be preset in the ETS.
The command value of emergency operation is always constant and is configured in-
dividually in the ETS (0...100% in 10% steps). The command value is executed elec-
trically at the output using a pulse width modulation (PWM).
When emergency operation is active, valve outputs configured to the com-
mand value data formats "Switching (1-bit)" or "Constant (1-byte) with com-
mand value limiting value" are always activated by a constant command value
with pulse width modulation. In this case, this constant command value is also
included in the calculation of the largest command value (optional function) un-
til the emergency operation is exited and no other function with a constant
command value presetting (e.g. forced position, manual operation) is active.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Function
Command value
Name
VOx - Input (x =
1...6)
Type
DPT
Flag
1 bytes 5,001
C, (R), W, -,
-
Page 81 of 257
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