In the early phases in the development of control unit software, the work is carried out in physical parameters irrespective of the implementation. Global physical data types ( <sw-physic-types>) can be defined in the data dictionary to support this phase.
Reference can be made for the definition of variables ( <sw-variable>) to the physical data types that are already available by referencing ( <sw-physic-type-ref>).
There is however also the possibility of directly defining the physical data type for the variable ( <sw-physic-type-1>). For further details, refer to Physical data types .
Figure 10: Physical data types
The following example demonstrates the definition of a physical data type:
<sw-physic-type>
<long-name>Drehzahl</long-name>
<short-name>n</short-name>
<desc></desc>
<sw-unit-ref>Umin</sw-unit-ref>
<sw-limits>
<phys><phys-min>0</phys-min><phys-max>8000</phys-max></phys>
<coded><coded-min>0</coded-min><coded-max>256></coded-max></coded
</sw-limits>
<sw-resolution>20</sw-resolution>
<sw-data-type-scaling>8bit</sw-data-type-scaling>
<sw-variable-sample-rate>10</sw-variable-sample-rate>
<sw-var-init-value>0</sw-var-init-value>
<sw-var-not-av-value></sw-var-not-av-value>
</sw-physic-type>
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