Siemens SINUMERIK 840C - Manual (Page 694)

10 Axis and Spindle Installation 06.93
10.2 Axis-specific resolutions
10.2 Axis-specific resolutions
Corresponding data
MD 5002 bit 4-7 Input resolution
MD 564* bit 5 Rotary axis
MD 1800* bit 0-3 Position control resolution
MD 1800* bit 4-7 Display resolution
Indirectly related:
MD 155 Position controller's sampling interval
MD 160 Ratio of interpolation to position control
MD 168 Basic cycle time of drive
10.2.1 General remarks on the axis-specific resolutions
The axes can be matched to the controls via MD. It must be remembered that only specific
combinations are permissible, and care must be taken that the boundaries, maximum axis
speed and range limits are not exceeded.
The following types of resolution can be specified for axes:
• Input resolution:Set via MD for all axes
• Geometry resolution: Input resolution x 0.5
• Position control resolution: Set via MD for each axis
• Display resolution: Set via MD for each axis
• Measuring system resolution: Set via MD for each axis
The measuring system resolution is used for adapting the axes to the measuring system.
10.2.2 Input, display and position control resolution
The input resolution for the entire control is defined in MD 5002, bits 4 to 7. The input
resolution defines the geometry resolution for linear and rotary axes. Rotary axes have the
same input resolution as linear axes. The geometry resolution determines the interpolation
accuracy.
The input resolution also defines the number of maximum programmed decimal places after
the decimal point for positional values in the part program as well as the number of decimal
places after the decimal point for TO, ZO, SD etc. (and therefore also the maximum
achievable degree of precision).
The input resolution defines the units system (inch - metric - degrees).
The input resolution must be taken into account when entering machine data that must be
stored in the input system. The default value for linear axes is 10
-3 and for rotary axes
10 -3 degrees.
10–4 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)