Siemens SINUMERIK 840D sl Programming Manual

Spline type Properties and use
B spline
P5
P7
P6
P4
P3
P2
P1
P1 to P7: specified coordinates
B spline
Check polygon
Properties:
● Does not run through the specified intermediate points along the curve, but
only close to them. The intermediate points to not attract the curve. The curve
characteristic can be additionally influenced by weighting the intermediate
points using a factor.
● The curve characteristic is tangential with continuous curvature.
● Does not generate 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:
Their B spline is primarily intended as interface to CAD systems.
Work preparation
3.7 Special motion commands
NC programming
600 Programming Manual, 12/2019, 6FC5398-2EP40-0BA0

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