Siemens SINUMERIK 804D sl Commissioning Manual page 98

NCK start-up
10.2 System data
MD9011 DISPLAY_RESOLUTION_INCH (INCH unit system display resolution) can be used
to configure the display resolution for position values with inch setting. This allows you to
display up to six decimal places with the inch setting.
For the programming of parts programs, the input resolutions listed in the Programming
Guide apply.
Computational resolution
The computational resolution defines the maximum number of effective decimal places for all
data the physical unit of which is referred to a length or an angle, e.g. position values,
velocities, tool offsets, zero offsets, etc.
The desired computational resolution is defined using the machine data
• MD10200 INT_INCR_PER_MM (computational resolution for linear positions)
• MD10210 INT_INCR_PER_DEG (computational resolution for angle positions)
.
The default assignment is:
• 1000 increments/mm
• 1000 increments/degrees
The computational resolution thus also determines the maximum achievable precision for
positions and selected offsets. However, it is essential that the measuring system is adapted
to this degree of precision.
Note
Although the computational resolution is generally independent of the input/display
resolution, it should have at least the same resolution.
Rounding
The precision of angle and linear positions is limited to the computational resolution by
rounding the product of the programmed value with the computational resolution to an
integer number.
Example of rounding:
Computational resolution: 1000 increments/mm
Programmed path: 97.3786 mm
Effective value = 97.379 mm
Note
To keep rounding easily understandable, it is better to use powers of 10 for the
computational resolution (100, 1000, 10,000).
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CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0