Variable Step Switch (Step Vx) - Siemens Synco 200 Basic Documentation

Purpose of STEP Vx
Number
Activation
Note
Load connection
Example
Siemens
Building Technologies
8.4

Variable step switch (STEP Vx)

8.4.1 Purpose and activation
The STEP Vx (variable step switch) function block switches multi-stage
aggregates. All outputs can be set individually.
Depending on the type of controller, the following number of variable step switches
are available:
Controller Number of variable step switches
type
RLU202 1 = with a maximum of 2 steps
RLU202 None
RLU222 1 = with a maximum of 2 steps
RLU232 1 = with a maximum of 2 steps
RLU236 1 = with a maximum of 6 steps
1 = with a maximum of 2 steps (6 relays available
in total)
To activate the variable step switch, assign a relay Q... to the STEP 1 output.
Additionally, you can also configure the available analog output AO with each step
switch. The same settings are possible as with the modulating output, AO function
block. Accordingly, a Y output can also be assigned.
8.4.2 Operating principle
With variable step switching, you can set the digital outputs individually according
to the load.
You can define the digital output's direction of action via the switching point
settings. The digital outputs can overlap each other.
The following diagram shows an example of load connection.
Y+Q
MAX POS
AO
MIN POS
S2-ON
STEP 2
S2-OFF
S1-ON
STEP 1
S1-OFF
0 % 20 %
If the step switch is controlled by 2 internal sequence controllers, the larger signal
is effective (maximum selection).
Universal Controllers RLU2...
Aggregates
S2-ON < S2-OFF
S1-ON > S1-OFF
40 % 60 % 80 % 20% 100 %
Q
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CE1P3101en
29.08.2008