Step Control - ABB SA/S 12.16.6.1 Product Manual

®
ABB i-bus KNX
4.3.2

2 step control

Planning and application
2 step control is the simplest form of control. A control value is not calculated
here. The room thermostat sends a 1 via the communication object Switch if
a certain temperature is exceeded and a 0 if the value drops below a certain
temperature. These switch values are implemented by the SA/S.
The room thermostat hysteresis limits can be used for control stability. Use
of these limits does not effect the method of operation of the Switch
Actuator.
Room temperature
controller
(thermostat)
Calculated
control value
1
0
A room thermostat can use the control algorithm of a PWM control. As the
room thermostat sends ON and OFF telegrams to the SA/S, the actuator
operates like a 2 step control.
Setpoint temperature
t
t
SA/S | 2CDC 505 056 D0207 155