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Introduction to the technical reference manual
Functionality/Design
Presents the general concept of a function.
Function block
Each function block is imaged by a graphical symbol.
Input signals are always on the left side, and output signals on the right side. Settings are not
displayed. A special kind of settings are sometimes available. These are supposed to be connect-
ed to constants in the configuration scheme, and are therefore depicted as inputs. Such signals
will be found in the signal list but described in the settings table.
TUV
BLOCK
TRIP
BLKTR
STL1
VTSU
STL2
STL3
START
xx00000207.vsd
Figure 1:
Function block symbol example
Logic diagram
The description of the design is chiefly based on simplified logic diagrams, which use IEC sym-
bols, for the presentation of different functions, conditions etc. The functions are presented as a
closed block with the most important internal logic circuits and configurable functional inputs
and outputs.
Completely configurable binary inputs/outputs and functional inputs/outputs enable the user to
prepare the REx 5xx with his own configuration of different functions, according to application
needs and standard practice.
Chapter 1
Introduction
3
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