Compression Of Short Spline Blocks - Siemens SINUMERIK 840D sl Function Manual
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B1: Continuous-path mode, Exact stop, Look Ahead
4.5 Compressor functions
4.5.2
Compression of short spline blocks
Function
When spline blocks are generated to describe complex contours by means of CAD/CAM
systems, spline blocks with very short path lengths occur between spline blocks with long path
lengths. These force the control to significantly reduce the path velocity. The functions for the
compression of short spline blocks generate new spline blocks with the longest possible path
lengths.
Availability
System
SINUMERIK 840D sl
SINUMERIK 828D
Parameterization
The compression of short spline blocks can be activated for the following spline types:
● BSPLINE
● BSPLINE/ORICURVE
● CSPLINE
It is activated in the channel-specific machine data:
MD20488 $MC_SPLINE_MODE, bit <n> = <value>
Bit
0
1
2
Supplementary conditions
● If commands that are not traverse commands, e.g. auxiliary function outputs, are
programmed in and between the traversing blocks to be compressed, the spline blocks
cannot be combined.
● The maximum number of blocks that can be combined into a program section in succession,
depends on the parameterized size of the block memory available in the block preparation.
MD28070 $MC_MM_NUM_BLOCKS_IN_PREP (number of blocks for block preparation)
230
<value>
Meaning: Combine short spline blocks is
0
Not active for BSPLINE
1
Active for BSPLINE
0
Not active for BSPLINE/ORICURVE
1
Active for BSPLINE/ORICURVE
0
Not active for CSPLINE
1
Active for CSPLINE
Availability
Standard (basic scope)
Option
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions
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