01/2007
11.3 System data
11-292
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
11.3 System data
11.3.1 Resolutions
The following types of resolution, e.g. resolution of linear and angular positions,
velocities, accelerations and jerk, must be differentiated as follows:
S the input resolution, i.e. the input of data from the user interface or using
the part 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 part 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. This allows you to display up to six decimal places with the inch setting.
For the programming of part programs, the input resolutions listed in the Pro-
gramming Guide apply.
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 MD 10200: INT_INCR_PER_MM (computational resolution for linear positions)
S MD 10210: INT_INCR_PER_DEG (computational resolution for angle positions).
The default assignment is:
S 1000 increments/mm
S 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.
The precision 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.
Input and display
resolution
Computational
resolution
Rounding
11 NCK Commissionin
with HMI Advanced
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