Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
10.7 Variable step switch (4…5)
This function is used to switch multistage aggregates. All outputs can be set
individually.
123456 12
y1 y2 x
QQQQQQ Y YQQ
xy2y1
QQ
34
y3 y3
Step switch 4 (var)
ReleaseRelease
Step switch 5 (var)
10.7.1 Activate block
The variable step switch is activated by assigning it to output Qx on Step 1 or to a
modulating output of output Y.
Step switch 4 can be configured for max 6 steps; step switch 5 for max 4 steps.
Main menu > Commissioning > Extra configuration> Aggregates > Step switch > Step
switch 4...5 >
Operating line Adjustable values / remarks
Step 1 ---, N.Q1, N.Q2, ... (free outputs only)
Step 2 ---, N.Q1, N.Q2, ... (free outputs only)
Step 3 ---, N.Q1, N.Q2, ... (free outputs only)
Step 4 ---, N.Q1, N.Q2, ... (free outputs only)
Step 5 ---, N.Q1, N.Q2, ... (free outputs only)
Step 6 ---, N.Q1, N.Q2, ... (free outputs only)
Modulating output ---, N.Y1, N.Y2, ... (free outputs only)
10.7.2 Operating principle
With variable step switching, you can set the digital outputs individually according
to the load.
The step switches can be controlled by max three internal sequence controllers
(see section 15.1.1 "Assign aggregates to sequences") with the highest signal
being valid (max. selectio
n).
20
40 60 80
0
max
min
[%]
100
Y
Load
3140D22en
[Step 2] ON
<
[Step 2] OFF
[Step 2] ON
[Step 2] OFF
[Step 1] ON
[Step 1] OFF
[Step 1] ON > [Step 1] OFF
Configuration
Example for switching
additional load