Preconditions; General Functionality - Siemens SINUMERIK 840D sl Function Manual

M3: Coupled axes
8.2 Curve tables - 840D sl only
Curve tables can be saved in dynamic NC memory for faster access. Please note that tables
need to be reloaded after run-up.
Axis groupings with curve tables must be reactivated independently of the storage location of
the curve table after POWER ON.
Linear curve table segments are stored in separate areas to save memory space.
8.2.1.2

Preconditions

Memory configuration
Static NC memory
Memory space for curve tables in static NC memory is defined by machine data:
MD18400 $MN_MM_NUM_CURVE_TABS (number of curve tables)
MD18402 $MN_MM_NUM_CURVE_SEGMENTS (number of curve segments)
MD18403 $MN_MM_NUM_CURVE_SEG_LIN (number of linear curve segments)
MD18404 $MN_MM_NUM_CURVE_POLYNOMS (number of curve table polynomials)
Dynamic NC memory
Memory space for curve tables in dynamic NC memory is defined by machine data:
MD18406 $MN_MM_NUM_CURVE_TABS_DRAM (number of curve tables)
MD18408 $MN_MM_NUM_CURVE_SEGMENTS_DRAM (number of curve segments)
MD18409 $MN_MM_NUM_CURVE_SEG_LIN_DRAM (number of linear curve segments)
MD18410 $MN_MM_NUM_CURVE_POLYNOMS_DRAM (number of curve table polynomials)
8.2.2

General functionality

Curve table
A functional relation between a command variable "master value" and an abstract following
value is described in the curve table.
A following variable can be assigned uniquely to each master value within a defined master
value range.
Curve segment
The functional relation can be subdivided into separate sections of the master value axes,
called curve segments.
Within a curve segment, the relation between the master value and following value is generally
described by a polynomial up to the third order. Polynomials up to the 5th degree are also
permissible.
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Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions