Siemens SINAMICS S120 Function Manual page 870

Basic information about the drive system
13.10 System rules, sampling times and DRIVE-CLiQ wiring
Cycle times for V/f control
The following table lists the number of axes that can be operated with a Control Unit in the
V/f control mode. The number of axes is dependent on the current controller clock cycle:
Table 13- 21 Sampling time setting for V/f control
Cycle times [µs]
Current Speed controller
controller
500 2000
Mixed operation of servo control and V/f open-loop control
In mixed operation with servo control and V/f control, one axis in servo control at 125 µs
uses exactly as much computing power as two axes in V/f control at 500 µs. In conjunction
with servo control, a maximum of 11 axes are permitted (1 servo control plus 10 vector
control V/f).
Table 13- 22 Number of axes for mixed servo control operation
Mixed operation of vector control and V/f open-loop control
In mixed operation with vector control and V/f control, one axis in vector control at 250 µs
uses exactly as much computing power as two axes in V/f control at 500 µs. In conjunction
with vector control, a maximum of 11 axes are permitted (1 vector control plus 10 V/f
control).
Table 13- 23 Number of axes for mixed vector control operation
870
Drives
12
Number of axes in servo control
6 125 µs
5 125 µs
4 125 µs
3 125 µs
2 125 µs
1 125 µs
0 -
Number of axes in vector control
6 500 µs
5 500 µs
4 500 µs
3 500 µs
2 500 µs
1 500 µs
0 -
Number
Infeed
1 [250 μs]
3 62.5 µs
- -
2 62.5 µs
- -
1 62.5 µs
- -
0 -
3 250 µs
- -
2 250 µs
- -
1 250 µs
- -
0 -
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Motor / direct
measuring
systems
- / - 3 [2000 μs]
Number of axes in V/f control
0
2
4
6
8
10
12
Number of axes in V/f control
0
2
4
6
8
10
12
TM/TB
-
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
-
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
Drive functions