Siemens SINAMICS S120 Function Manual page 912

Basic information about the drive system
12.12 System sampling times and number of controllable drives
Cycle times for vector control
This following table lists the number of axes that can be operated with a Control Unit in the
vector control mode. The number of axes is also dependent on the cycle times of the
controller:
Table 12- 15 Sampling time setting for vector control
Cycle times [µs]
Current Speed controller
controller
500 µs 2000 µs
400 µs 1600 µs
3)
250 µs 1000 µs
Valid for TM31 or TM15IO; for TM54F, TM41, TM15, TM17, TM120, TM150 - restrictions are possible dependent on the
1)
set sampling time.
For power units in chassis format, the infeed cycle depends on the power rating of the module and can be 400 μs, 375
2)
μs or 250 μs.
This setting results in lower remaining computation times.
3)
In closed-loop vector control, current controller cycles can be mixed with 250 µs and 500 µs.
Note
Restriction for the chassis format
If edge modulation and wobbling are activated simultaneously with p1802 ≥ 7 and p1810.2 =
1 respectively, the quantity structure for vector control is halved. Then a maximum of 3 axes
at a current control cycle of 500 µs, 2 axes at 400 µs or 1 axis at 250 µs are permissible.
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- 16 Sampling time setting for U/f control
Cycle times [µs]
Current Speed controller
controller
500 2000
910
Number
Axes Infeed
6 1 [250 μs]
5 1 [250 μs]
3 1 [250 μs]
Number
Drives / Infeed
12 1 [250 μs]
Motor / dir.
measuring
2)
systems
6 / 6
5 / 5
3 / 3
Motor / dir.
measuring
systems
- / -
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
TM /TB
1)
3 [2000 μs]
3 [2000 μs]
3 [2000 μs]
TM/TB
3 [2000 μs]
Drive functions