Siemens SINUMERIK 840Di sl Programming Manual page 534

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/subroutine
Every global main program/subroutine can only appear once under its own name in the
directory, and it is not possible to have the same program name in different directories with
different contents as a global program.
Ground
Ground is taken as the total of all linked inactive parts of a device which will not become live
with a dangerous contact voltage even in the event of a malfunction.
Helical interpolation
The helical interpolation function is ideal for machining internal and external threads using
form milling cutters and for milling lubrication grooves.
The helix comprises two movements:
• Circular movement in one plane
• A linear movement perpendicular to this plane
High-level CNC language
The high-level language offers: -> User-defined variable, -> System variable, -> Macro
technique.
High-speed digital inputs/outputs
The digital inputs can be used for example to start fast CNC program routines (interrupt
routines). The digital CNC outputs can be used to trigger fast, program-controlled switching
functions (SINUMERIK 840D).
HIGHSTEP
Summary of the programming options for the -> PLC in the AS300/AS400 system.
Inch measuring system
Measuring system, which defines distances in inches and fractions of inches.
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals