Memory Organization - Siemens SINUMERIK 840D sl Function Manual

Reference:
Programming Manual, Production Planning
Curve segments are used if:
● Polynomes or circles are programmed
● Spline is active
● Compressor is active
● Polynomials or circles are generated internally (chamfer/rounding, approximate positioning
with G643, WRK etc.)
Tool radius compensation
Curve tables are available in which it is possible to specify the tool radius compensation in the
table definition even if polynomial blocks or blocks with no motion for an axis, or jumps for the
following axis, occur in the curve table (G41/G42/G40 in the table definition).
The equidistant curve (tool center point path of tool radius compensation) of a curve consisting
of polynomials can no longer be displayed exactly using polynomials. The associated curve
tables must be approximated stepwise, using polynomials in this case. This means that the
number of segments in the curve table no longer matches the number of programmed
segments. The number of segments required for the curve table is defined by the bend of the
curve. The larger the curvature for the programmed curve, the more segments are required
for the curve table.
On account of tool radius compensation for curve tables, more memory may be required.
Selection option of the memory type should not produce shortage of static NC memory.
Selection of memory type
While defining a curve table, it can be defined whether the curve table is created in the static
or dynamic NC memory.
Note
Table definitions in the static NC memory are available even after control system run-up. Curve
tables of the dynamic NC memory must be redefined after every control system run-up.
8.2.3

Memory organization

Memory configuration
The storage place available for the curve table in the static and dynamic NC memory is defined
during memory configuration (see Section "Memory configuration (Page 309)").
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
M3: Coupled axes
8.2 Curve tables - 840D sl only
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