9.3 Control strategies and setpoints for
universal controllers
The control strategies and setpoints for universal control are presented. These are
controller 2 in basic type A and controllers 1 and 2 in basic type U.
9.3.1 Selecting the control strategy
Controller 2 in basic type A and controllers 1 and 2 in basic type U are intended for
universal control.
You can select one of 2 control strategies. For that purpose, the following settings
are required:
Control strategy Required input identifiers
Footnote 1
Connection
inputs –
control
loop
Footnote 2
Control to a sensor
input
Any analog input MAIN
Differential control Any analog input (main controlled variable)
Any analog input (same unit as main controlled
variable)
MAIN
DIFF
Control strategies
controller 2,
basic type A
Or controllers 1 + 2,
basic type U
Explanations
1 Any input Xx of the input block can be used.
2 The "connection" is made as a setting value in controller 1 or controller 2 block.
9.3.2 Activation
To activate the controller, assign the main controlled variable (MAIN). The choice of
main controlled variable determines the physical unit.
Activation
9.3.3 Operating principle
PID control maintains the main controlled variable at the adjusted setpoint.
PID control
105 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008
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