Siemens SINUMERIK 840D Programming Guide

5
04.00 Special Motion Commands
5.2 S
p
line inter
p
olation
5
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC 810D 840Di

Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA)
−
04.00 Edition
5-157
What does which spline do?
Comparison of three spline types with identical
interpolation points:
A spline (akima spline)
B spline (Bezier spline)
C spline (cubic spline)
P2
P3
P4
P6
P7
P5
P1
A spline
B spline
C spline
Spline grouping
Up to eight path axes can be involved in a spline
interpolation grouping. The SPLINEPATH instruction
defines which axes are to be involved in the spline.
The instruction is programmed in a separate block. If
SPLINEPATH is not explicitly programmed, then the
first three axes in the channel are traversed as the
spline grouping.

Siemens SINUMERIK 840D Specifications

General

Series	SINUMERIK 840D
Axes	Up to 31
Channels	Up to 10
Operating System	Windows-based
Power Supply	24 V DC
Control Unit Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
Interpolation	Spline
PLC	Integrated PLC
Data Storage	CompactFlash, USB