Siemens SINUMERIK 840C User Manual
Page 334
09.95
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.4 Axis-specific MD bits 1 (axial bits 1)
7
6
5
4
3
2
1
0
Bit No.
NC MD
572*
Traverse
rotary axis
modulo 360
deg.
TO
mirroring for
transverse
axis
Modulo
360° prog.
of rotary
axis
Transverse
axis
Axes
without TO
on PRESET
Default value:
MD 572 = 0000 1010 only on the 840C; otherwise, all bits are 0.
For 840C (M), all are 0.
Active:
In the next block
Bit 4
Bit 4 = 0
When G90 and/or G68 are programmed with rotary axes, traversing paths
of > 360 degrees or > 180 degrees can result, and the established
direction of movement can change if zero offsets, tool offsets etc. are set
up for the first time or if ZO, TO etc. are altered in the program.
Example:
N1 G90 C0 LF
(C ... rotary axis)
N2 C90 LF
N3 G58 C-180 LF
N4 G90 C+135 LF
N2
90
0
135
0
180
0
315
0
0
0
N4
N3
(Bit 4=0) traversing path resulting from N3+N4.
(Bit 4=1) traversing path resulting from N3+N4.
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Siemens AG 1992 All Rights Reserved 6FC5197- AA50
6–149
SINUMERIK 840C (IA)