Siemens SINUMERIK 840D sl Programming Manual

Properties and use of the various spline types
Spline type Properties and use
A spline
P5
P7
P6
P4
P3
P2
P1
P1 to P7: specified coordinates
A spline (akima spline)
Properties:
● Passes exactly through the specified intermediate points along the curve.
● The curve characteristic is tangential, but does not have continuous curvature.
● Produces hardly any undesirable oscillations.
● The area of influence of changes to intermediate points along the curve is local.
This means that a change to an intermediate point along the curve only affects
up to max. 6 adjacent intermediate points.
Application:
The A spline is especially suitable for interpolating curves with large changes in the
gradient (e.g. staircase-type curves and characteristics).
Work preparation
3.7 Special motion commands
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 599

Siemens SINUMERIK 840D sl Specifications

General

Control Type	CNC
Number of Axes	Up to 31
Max Number of Channels	10
Interfaces	Ethernet, PROFIBUS, PROFINET, USB
Interpolation	5-axis interpolation
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Display	TFT color display, various sizes
Programming Languages	DIN/ISO
Safety Features	Safety Integrated
PLC	Integrated PLC S7-300
Drive Interface	SINAMICS S120
Data Storage	CF card, USB
Operating System	Windows-based