Siemens SINUMERIK 828D Function Manual page 198

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Table of Contents

B1: Continuouspath Mode, Exact Stop, LookAhead

3.5 Compressor functions

Parameter assignment

Maximum path length

The maximum distance up to which a block is still compressed, is set using machine data:

MD20170 $MC_COMPRESS_BLOCK_PATH_LIMIT

Longer blocks are not compressed, but are traversed normally.

Recommended setting: 20 [mm]

Maximum deviation of the path feedrate FLIN and FCUB

The maximum permissible deviation of the path feedrate for active compressor function COMPON or

COMPCURV is specified in the machine data in conjunction with FLIN and FCUB:

MD20172 $MC_COMPRESS_VELO_TOL

The higher the permissible deviation, the more short blocks that can be compressed into a long block.

Recommended setting: 100 [mm/min]

Axial deviation

For each axis involved in the compression, a maximum tolerable deviation of the generated path from the

program points can be specified. The setting is done on an axis-for-axis basis using the machine data:

MD33100 $MA_COMPRESS_POS_TOL

The higher the permissible deviation, the more short blocks that can be compressed into a long block.

Recommended setting: 0.01 [mm]

Contour accuracy

The maximum tolerable deviation of the generated path from the programmed points is specified using the

following setting data for each channel:

SD42475 $SC_COMPRESS_CONTUR_TOL

Compression mode

The manner in which the maximum tolerable deviation from MD33100 and SD42475 is taken into account is set

via the units position in the machine data:

MD20482 $MC_COMPRESSOR_MODE (mode of compression)

The tolerances specified with MD33100 $MA_COMPRESS_POS_TOL are maintained

for all the axes (geo and orientation axes).

The tolerances specified with SD42475 $SC_COMPRESS_CONTUR_TOL are

maintained for the geometry axes.

The tolerances specified with MD33100 $MA_COMPRESS_POS_TOL are maintained

for the orientation axes.

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Basic Functions

Sinumerik 840d sl