3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
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Data library
8
The communication system of the SENTRON circuit breakers is extremely versatile and
flexible. The large number of data points can be read, and to a certain extent written, via
data sets. Many of them can be integrated into the cyclic message frame. This chapter
provides a detailed description of the different data points and their properties.
General
The basis for the shared profile of the SENTRON circuit breakers is an overall database
referred to as a data library. This data library defines which circuit breaker supports which
data points.
Properties of the data points
The data library also describes the properties of all data points:
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What is the data point number of this data point and what is its name?
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What is the source of this data point?
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What is the format of this data point?
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What is the size of this data point?
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What is the scaling of this data point?
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In which data set is this data point available?
8.1
Chapter overview
This chapter describes the data points of the data library.
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In the first section, the data points are combined into function classes. Function classes
are, for example, data for identification, device parameters, or measured values. This
subdivision quickly enables users to find the desired data point and its properties.
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The second part of this chapter describes the structure of the read/write data sets that in
turn consist of the data points described in the previous section. This allows the data sets
transferred via PROFIBUS to be interpreted in the master.
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The third section of this chapter describes the different formats of the data points. This
includes the description of the Motorola format used, e.g. "int" and "unsigned int", as well
as, above all, the description of special formats. A special format is, for example, the
binary breakdown of the data point that specifies the last tripping operation.