Siemens SINUMERIK 840D sl Operating Manual page 45

Value range tab
In the "Value range" tab, the value-based comparison of floating-point numbers is displayed
at significant points.
Floating point numbers are saved separately and internally in the computer in mantissa and
exponent.
The exponent is adapted in such a way that the mantissa is normalized, i.e. in the range of
1 <= m < 10.
The maximum possible number of significant digits is thus 7 for floating values and 15 for
double values.
Other inaccuracies can occur as a result of parameter calculations, which can be consciously
ignored during the comparison.
When the comparison algorithm is activated, the difference of the values is normalized via the
absolute value of the values. If this is then less than the specified significant digit (the mantissa),
the values are considered equal.
Comment tab
Any comments for the selected comparison configuration can be saved in the "Comment" tab.
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