Siemens SINUMERIK 840D sl Function Manual page 1107

Incremental dimension
Also incremental dimension: A destination for axis traversal is defined by a distance to be
covered and a direction referenced to a point already reached. See → Absolute dimension.
Intermediate blocks
Motions with selected → tool offset (G41/G42) may be interrupted by a limited number of
intermediate blocks (blocks without axis motions in the offset plane), whereby the tool offset
can still be correctly compensated for. The permissible number of intermediate blocks which
the control reads ahead can be set in system parameters.
Interpolator
Logic unit of the → NCK that defines intermediate values for the motions to be carried out in
individual axes based on information on the end positions specified in the part program.
Interpolatory compensation
Interpolatory compensation is a tool that enables manufacturing-related leadscrew error and
measuring system error compensations (SSFK, MSFK).
Interrupt routine
Interrupt routines are special → subroutines that can be started by events (external signals)
in the machining process. A part program block which is currently being worked through is
interrupted and the position of the axes at the point of interruption is automatically saved.
Inverse-time feedrate
With SINUMERIK 840D, the time required for the path of a block to be traversed can be
programmed for the axis motion instead of the feed velocity (G93).
JOG
Control operating mode (setup mode): In JOG mode, the machine can be set up. Individual
axes and spindles can be traversed in JOG mode by means of the direction keys. Additional
functions in JOG mode include: → Reference point approach, → Repos, and → Preset (set
actual value).
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Glossary
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