Siemens Sinumerik 840D sl Programming Manual page 196

Glossary
Geometry
Description of a -> workpiece in the -> workpiece coordinate system.
Geometry axis
Geometry axes are used to describe a 2- or 3-dimensional range in the workpiece coordinate
system.
Global main program/subprogram
Each global main program/subprogram can be stored only once under its name in the
directory. However, the same name can be used several times in one and the same
directory.
Ground
The term "Ground" is used for all electrically inactive, interconnected parts of one part of the
system or a resource which cannot result in dangerous touch voltage in the event of errors.
Helical interpolation
The "Helical interpolation" function is especially suitable for machining female or male
threads with form cutters and for milling lubricating grooves. The helix comprises two
movements:
Circular movement in the plane
Linear movement vertical to this plane
High-speed digital inputs/outputs
Example: high-speed CNC program routines (interrupt routines) that can be started via
digital inputs. Digital CNC outputs (SINUMERIK 840D) can be used to trigger switching
functions operated by high-speed programs .
HIGHSTEP
Combination of different programming features for the -> PLC in the range S7-300/400.
Identifiers
According to DIN 66025, identifiers (names) of variables (arithmetic variables, system
variables, user variables), of subprograms, of vocabulary words and of words can contain
several address characters. These letters have the same meaning as the words in the block
syntax. Identifiers must always be unique. Different identifiers should always be used for
different objects.
Inch measuring system
Measuring system with which the distance traversed and fractions thereof are specified in
inches.
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling