Siemens SINUMERIK 840D sl Function Manual page 401

This diagram shows how input values are converted into internal units.
It also shows the following conversion to internal increments/(mm or degrees), which can
cause loss of decimal places if the computational resolution was selected to be coarser than
the input resolution.
In addition, it provides an overview of the following topics:
• Selection of measuring system (metric/inch)
• Scaling of physical quantities of machine and setting data
• Conversion of basic system
• Setting of computational resolution
An example is given showing how a physical quantity
(MD36110 $MA_POS_LIMIT_PLUS)
as a function of machine data parameterization
(MD10230 $MN_SCALING_FACTORS_USER_DEF,
MD10220 $MN_SCALING_USER_DEF_MASK).
2.1.5 Input/display resolution, computational resolution
Resolutions: Differences
Resolutions, e.g. resolutions of linear and angular positions, velocities, accelerations and
jerk, must be differentiated as follows:
• Input resolution
• Display resolution
• Computational resolution
The input and display resolution is defined via the control panel being used, whereby the
display resolution of position values can be changed with machine data:
MD9004 $MM_DISPLAY_RESOLUTION
.
Machine data:
MD9011 $MM_DISPLAY_RESOLUTION_INCH
can be used to configure the display resolution of position values using the inch system.
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.
The desired computational resolution is defined via machine data:
MD10200 $MN_INT_INCR_PER_MM (computational resolution for linear positions)
or
MD10210 $MN_INT_INCR_PER_DEG (computational resolution for angular positions).
Basic logic functions: Velocities, Setpoint/Actual Value Systems, Closed-Loop Control (G2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Data is input via the control panel or parts programs.
Data is displayed via the control panel.
Data input via the control panel or parts program is displayed internally.
2.1 Velocities, traversing ranges, accuracies
Detailed description
13