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 a
a a a
a a a
a a a
90
a a a a a
a a a a a
a a a a a
a a a a a
270
a a a a a
a a a a a
a a a a a
a a a a a
N12
a a
a a
a a
a a
0
a a a a a
a a a a a
a a a a a
a a a a a
180
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
N10
a a a a a
a a a a a
a a a a 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)
Summary of Contents for SIMODRIVE 611-D
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