Siemens SINUMERIK 840D sl Function Manual page 782

Glossary
Tool nose radius compensation
Contour programming assumes that the tool is pointed. Because this is not actually the case
in practice, the curvature radius of the tool used must be communicated to the control which
then takes it into account. The curvature center is maintained equidistantly around the
contour, offset by the curvature radius.
Tool offset
Consideration of the tool dimensions in calculating the path.
Tool radius compensation
To directly program a desired → workpiece contour, the control must traverse an equistant
path to the programmed contour taking into account the radius of the tool that is being used
(G41/G42).
Transformation
Additive or absolute zero offset of an axis.
Traversing range
The maximum permissible travel range for linear axes is ± 9 decades. The absolute value
depends on the selected input and position control resolution and the unit of measurement
(inch or metric).
User memory
All programs and data, such as part programs, subroutines, comments, tool offsets, and zero
offsets/frames, as well as channel and program user data, can be stored in the shared CNC
user memory.
User Program
User programs for the S7-300 automation systems are created using the programming
language STEP 7. The user program has a modular layout and consists of individual blocks.
The basic block types are:
• Code blocks
These blocks contain the STEP 7 commands.
• Data blocks
These blocks contain constants and variables for the STEP 7 program.
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions