System Data - Siemens SINUMERIK 840Di Manual
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06.03
10.3
System data
10.3.1
Resolutions
Input and display
resolution
Computational
resolution
Tip
Rounding
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
The resolutions of linear and angle positions, velocities, accelerations and jerk
differ by:
S
the input resolution, i.e. the input of data from the user interface or using
the parts programs
S
the display resolution, i.e. the display of data on the user interface
S
the computational resolution, i.e. the internal representation of the data
input through the user interface or the parts program.
The input and display resolution is determined by the control unit used whereby
the display resolution for position values can be modified using the MD 9004:
DISPLAY_RESOLUTION (display resolution).
MD 9011: DISPLAY_RESOLUTION_INCH (INCH unit system display resolu-
tion) can be used to configure the display resolution for position values with inch
setting. With inch setting, it is thus possible to display up to six digits after the
comma.
For programming in parts programs, the input resolutions indicated in the Pro-
gramming guide.
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
S
Check MD 10200: INT_INCR_PER_MM (computational resolution for linear
positions)
S
Check MD 10210: INT_INCR_PER_DEG (computational resolution for
angle positions).
The default assignment is:
S
1,000 increments/mm
S
1,000 increments/degree.
The computational resolution thus also determines the maximum achievable
accuracy for positions and selected offsets. However, it is essential that the
measuring system is adapted to this degree of accuracy.
Although the computational resolution is generally independent of the input/dis-
play resolution, it should have at least the same resolution.
The accuracy of angle and linear positions is limited to the computational reso-
lution by rounding the product of the programmed value with the computational
resolution to an integer number.
Example of rounding:
10 NC Start-Up with HMI Advanced
10.3 System data
10-281
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