Overview Of Function Blocks - Siemens RMB795B Basic Documentation

Configuration diagram,
use
Designations
Use of inputs Xx
Procedure for extra
configuration
Use of outputs Yx
Introduction
Siemens
Building Technologies
• Function blocks for supervision, heat and refrigeration demand, including the
functions provided by the extension modules.
Planning engineers use the configuration diagram to draw connections between
individual input and output functions (or their internal signals) and the assigned
terminals.
Devices and extension modules:
• N
Central control unit RMB795B
• A5
Universal module RMZ785
• A7(1) Universal module RMZ787 (first module)
• A7(2) Universal module RMZ787 (second module)
Physical inputs:
• D
digital
• X
universal
Physical outputs:
• Q relay
• Y
DC 0...10 V
The following rules and properties apply to inputs:
• The input identifier can be a device or a special sensor (outside temperature).
• Multiple use of inputs is possible, no limitations (e.g. fire alarm off acts on
several room groups).
• When an input is connected, the controller presents only the possible units on
the display
• Alarming for inputs is only active if the input is connected prior to the end of
commissioning.
Order of configuration:
• First basic configuration, then extra configuration.
• First the input identifiers, then the operating modes with all control functions
Possible wiring:
• Always from the arrow to the line
• From function to input: "x" to "x"
• From output block to output terminal: Analog "Y" to "Y"
• Relay "Q" to "Q".
When using the outputs, observe the following rules:
• Connect the output functions to the relevant terminals
• Each output terminal can be used only once (e.g. N.Q1 for the fault relay)

19.2.2 Overview of function blocks

The following pages provide an overview of the function blocks for the RMB795B
central control unit, including a brief description. For the number of function blocks
and the assignment of inputs and outputs, refer to the configuration diagram of the
RMB795B.
Central control unit RMB795B
Appendix
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CE1P3122en
18.01.2012