Siemens Sinamics S120 Function Manual page 768

Basic information about the drive system
12.12 System sampling times and number of controllable drives
Cycle times for U/f control
This following table lists the number of axes that can be operated with a Control Unit in the
U/f control mode. The number of axes is dependent on the current controller clock cycle:
Table 12- 19 Sampling time setting for U/f control
Cycle times [µs]
Current Speed controller
controller
500 2000
Mixed operation of servo control and U/f open-loop control
In mixed operation with servo control and U/f control, one axis in servo control at 125 µs
uses exactly as much computing performance as two axes in U/f control at 500 µs. In
conjunction with servo control, a maximum of 11 axes are permitted (1 servo plus 10 vector
U/f).
Table 12- 20 Number of axes for mixed servo control operation
Mixed operation of vector control and U/f open-loop control
In mixed operation with vector control and U/f control, one axis in vector control at 250 µs
uses exactly as much computing performance as two axes in U/f control at 500 µs. In
conjunction with vector control, a maximum of 11 axes are permitted (1 vector plus 10 U/f).
Table 12- 21 Number of axes for mixed vector control operation
766
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), 01/2012, 6SL3097-4AB00-0BP2
Motor / dir.
measuring
systems
- / - 3 [2000 μs]
Number of axes in U/f control
0
2
4
6
8
10
12
Number of axes in U/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