Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Operating modes 03.10.2011
6.4.3 Plant operating mode presetting (basic type C)
The controller is switched on demand-controlled to demand mode via
communication or via the request input at the operating mode block (see section
6.6 "Plant operating mode selection via request input (basi
c type P, C)"). Here, the
plant operating modes "Demand operation" or "Plant OFF" are commanded via
communication or request input.
In addition, the time switch can be used as an option for other controllers on the
bus (see section 6.9.1 "Activate time switch"). The time switch allows for setting the
room o
perating modes (Comfort, Precomfort and Economy). The external
controllers (e.g. RMU7..B with basic type U) convert the room operating mode to
the corresponding plant operating mode.
The demand-controlled chilled water controller is available for the following
applications:
 Chilled water precontrol.
The switch-on command is received via bus from the secondary controllers (e.g.
RMU7..B with basic type U) with a refrigeration demand signal
 Precontrol for 2-pipe system (heating / cooling changeover).
The switch-on command is received via bus from the secondary controllers (e.g.
RMU7..B with basic type U) with a heating and refrigeration demand signal
6.5 Room operating mode selection via digital
inputs (basic types A, U)
This function provides for intervention in the current program without having to
make any changes at the controller. In order to activate this function, you have to
configure the appropriate digital inputs.
The following types of intervention can be configured:
 Timer function
 Switching to a desired operating mode or
 Room operating mode selector
If several of these functions are active at the same time, the following priority
applies:
1. Room operating mode selector or switching to a desired operating mode
2. Timer function
The following settings are required depending on the desired function:
Type of action Operating line Value
Timer function Timer function
Timer function (duration)
N.Xx
>0 min
Switching to the desired
operating mode
Room operating mode input 1
Room operating mode input 2
Preselected room optg mode
N.Xx
---
Setting the
desired
operating mode
Room operating mode
selector
Room operating mode input 1
Room operating mode input 2
N.Xn
N.Xm