8.5.3 External preselection (IN X)
You can configure an analog input (IN X) as a preselection for the step switch. The
controller performs a maximum selection together with the internal signals.
Maximum selection
For example, you can use this feature to implement the following function:
Example
DX cooling control, maximum selection between internal temperature control and
dehumidification signal from an external dehumidification controller.
The external signal is considered only if the controller operates in Comfort or
Economy mode.
Note
8.5.4 Output inversion (INVERS)
You can invert the step switch's analog output. Meaning:
Definition and behavior
INVERS = NO: 0…100% load = 0…100% output
INVERS = YES: 0…100% load = 100…0% output
The same settings are possible for this analog output as for the modulating output,
AO function block.
If the controller has a linear step switch and is switched off during operation (input
D1 = Protection), the output signal behaves as follows:
INVERS = NO: 0% output
INVERS = YES: 100% output
8.5.5 Function check / wiring test
The step switch can be switched directly via the control switch during the wiring
test.
Switching on / off
The switch has the following positions:
Switch positions
• ---
• 0…100 %
Settings such as INVERS, MIN POS and MAX POS are also effective during the
wiring test.
Note
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Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008
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