09.95 12 Functional Descriptions
12.2.2 Functional description
with calculation, and with G68, the programmed position is always approached over the
shortest path.
G68 is modal and belongs to the G90/91 group. If "modulo programming" is not activated,
G68 is treated like G90.
If the rotary axis is not to traverse over the shortest path, it must be programmed with G90
and a sign.
Example: Axis is at 270 degrees
N10 G68 C10
N11 G90 C10
N12 G90 C-10
a
a
90
a
a
a
a
a
a
270
a
a
a
a
a
a
N12
0
a
a
a
a
a
a
180
a
a
a
a
a
a
a
a
a
N10
a
a
a
a
a
a
N11
The machine data "Modulo 360°" and "Modulo programming" are permissible only in
conjunction with machine data "Rotary axis".
Subfunction combinations
Rotary axis Modulo prog. Modulo 360° Comments
564* Bit5 572* Bit 2 560* Bit 7 MD
0 0 0 Linear axis
1
1
1
0
0
1
0
1
1
Use permitted
1
0
0
0
1
0
1
1
0
1
1
0
Use illegal
Axis-specific machine data
If an axis is defined as rotary axis (NC MD 564, bit 5), the following applies in dependence on
NC MD (input resolution and position control resolution):
a) 1 unit = 2 units of position control resolution (reference system MS)
e.g. 1 unit of position control resolution = 0.5 x 10
-3
degrees
(NC MD 1800* = xxxxx 0101)
1 unit = 10
-3
degrees
b) 1 unit = 1 unit of input resolution (reference system IS)
e.g. 1 unit of input resolution = 10
-3
degrees (NC MD 5002 = x0100 xxxx)
1 unit = 10
-3
degrees
All axis-specific machine data is specified in degrees for a rotary axis, e.g. max. speed of a
rotary axis = 15 revs/min
15 revs/min x 360 degrees/rev = 5400 degrees/min
Entry in NC MD 280* = 5400 (1000 degrees/min)
For combinations of the various types of resolution and max. values, refer to the Section on
axis installation/start-up.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–11
SINUMERIK 840C (IA)
To Next Page
Loading...
Need help?
General
