Siemens SINUMERIK 840D sl Programming Manual page 935

Spline interpolation
With spline interpolation, the controller can generate a smooth curve characteristic from only
a few specified interpolation points of a set contour.
SRT
Transformation ratio
Standard cycles
Standard cycles are provided for machining operations, which are frequently repeated:
● Cycles for drilling/milling applications
● for turning technology
The available cycles are listed in the "Cycle support" menu in the "Program" operating area.
Once the desired machining cycle has been selected, the parameters required for assigning
values are displayed in plain text.
Subblock
Block preceded by "N" containing information for a sequence, e.g. positional data.
Subroutine
Sequence of statements of a → part program that can be called repeatedly with different
defining parameters. The subroutine is called from a main program. Every subroutine can be
protected against unauthorized read-out and display. → Cycles are a form of subroutines.
Synchronization
Statements in → part programs for coordination of sequences in different → channels at
certain machining points.
Synchronized actions
1. Auxiliary function output
2. Fast auxiliary function output
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
During workpiece machining, technological functions (→ auxiliary functions) can be output
from the CNC program to the PLC. For example, these auxiliary functions are used to
control additional equipment for the machine tool, such as quills, grabbers, clamping
chucks, etc.
For time-critical switching functions, the acknowledgement times for the → auxiliary
functions can be minimized and unnecessary hold points in the machining process can
be avoided.
Glossary
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