Siemens sinumerik 840D sl Function Manual page 250

Detailed description
2.2 Curve tables
2.2.3.2 Tool radius compensation
MD20900
Tool radius compensation can produce segments for which the following axis or leading axis
have no movement. A missing movement of the following axis does not normally represent
any problem. As against this, a missing movement of the leading axis requests a
specification as to how such discontinuities are to be handled, i.e., whether or not a curve
table should be generated in these cases. This specification is done in the machine data
settings:
MD20900 $MC_CTAB_ENABLE_NO_LEADMOTION (curve tables with discontinuity of the
following axis)
Value
0
1
2
Note
In the case of a curve table that contains segments without leading axis movement (this
means that the following axis jumps at this point), the following axis can only make a jump
within its dynamic limits (max. velocity and max. acceleration). This means that there is
always a deviation from the programmed curve.
2.2.3.3 Specification of memory type
MD20905
If there is no memory specification while defining or deleting a curve table, the memory type
can be determined through the following machine data:
MD20905 $MC_CTAB_DEFAULT_MEMORY_TYPE (default memory type for curve tables)
Value
0
1
30
Description
No curve tables that contain a discontinuity in the following axis are produced. Alarm 10949
is output and program processing is aborted.
Curve tables with a discontinuity in the following axis can be generated. If a segment
contains a discontinuity in the following axis, Alarm 10955 is output but program processing
is continued.
Curve tables with a discontinuity in the following axis can be created without an alarm being
output.
Description
Curve tabels are normally created in the static NC memory.
Curve tabels are normally created in the dynamic NC memory.
Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0