4. Configuration
52
Figure 4-10. Internal Points Configuration Example
Quality Conversions
The internal point's quality is a trust level information about the value stored on that point. The
quality may inform, for example, that the value stored is out of range, or yet that it is valid, but low
trusted.
The Standards IEC 61850, DNP3 and IEC 104 have their own formats to representation of point’s
quality information. The Nexto Series, by its turn, have its own quality format (but quite similar to
IEC 61850) called Internal Quality. This format is defined by type QUALITY (library
LibRtuStandard) and it is used internally to quality storage, allowing to be done conversion between
protocols without information loss.
When it is done a mapping of a same communication oint between two drivers, the quality
conversion is automatically realized in two steps. For example: in case a communication point is
mapped from a DNP3 Client driver to a IEC104 Server driver, first the quality will be converted from
DNP3 format to internal format (and stored internally in the CPU), after that it will be converted
from the internal format to IEC104 format.
The following tables define the protocols own formats convertion to internal format. Case it is
necessary to consult the conversion between protocols, it is needed to analise in two steps, looking
each of the tables to internal format and after correlating them.
Internal Quality
This is the QUALITY structure. Table 4-9 shows detailed each of its components.
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