ABB i-bus
KNX
Commissioning
122 2CDC 505 056 D0208 | SA/S
Connected valve type
Options:
normally closed
normally open
This parameter sets the valve type for the connected valve.
How does a de-energized closed (normally closed) valve react?
If no current is flowing in the control circuit, the valve closes.
The valve opens as soon as current is flowing in the control circuit.
How does a de-energized opened (normally open) valve react?
If no current is flowing in the control circuit, the valve opens.
The valve closes as soon as current is flowing in the control circuit.
Control telegram is received as
The heating actuator can either be controlled via the 1 bit communication object
Switch
or the 1 byte
communication object
Control value (PWM).
Options:
1 bit (PWM or on-off control)
1 byte (continuous)
•
1 bit (PWM or on-off control):
The room thermostat controls the heating actuator via standard
switching telegrams. This enables on-off control of the control value. The 1 bit value can also originate
from pulse width modulation (PWM) calculated by a room thermostat. During a malfunction when the
control signal is not received by the room thermostat, the Switch Actuator will undertake an
autonomous PWM calculation. The SA/S uses the parameterizable PWM cycle time for this.
•
1 byte (continuous)
: A value of 0…255 (corresponds to 0 %…100 %) is preset by the room thermostat.
This process is also known as “continuous-
action control”. At 0 % the valve is closed and at 100 %,
fully open. The heating actuator controls intermediate values via pulse width modulation.
For further information see:
Pulse width modulation (PWM)
, p. 163 and
Pulse width modulation – calculation
, p. 164
Содержание i-bus SA/S 2.6.2.1
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