Siemens SINAMICS S120 Function Manual page 1032

Basic information about the drive system
13.12 System rules, sampling times and DRIVE-CLiQ wiring
Current controller sampling times for cycle mix
Consequently the smallest common multiple of the current and speed controller sampling
times of all axes operated on the isochronous PROFIBUS is used to set the base cycle for
T , T
i
T , T
i
Table 13- 22 Examples of cycle mixes for servo control
Cycle mix: Current controller sampling times
Base cycles for the isochronous PROFIBUS for a cycle mix with 125 μs
Table 13- 23 Examples for cycle mixes for vector control
Cycle mix: Current controller sam-
Base cycles for the isochronous PROFIBUS for a cycle mix with 250 μs
1032
and T . For a cycle mix, a compromise must be sought between the base cycle to set
o dp
and T , and the required pulse frequency.
o dp
[µs]
250.00 +125.00
187.50 +125.00
150.00 +125.00
125.00 +125.00
100.00 +125.00
93.75 +125.00
75.00 +125.00
62.50 +125.00
50.00 +125.00
37.50 +125.00
31.25 +125.00
pling times [µs]
500.00 +250.00
375.00 +250.00
312.50 +250.00
250.00 +250.00
218.75 +250.00
200.00 +250.00
187.50 +250.00
175.00 +250.00
156.25 +250.00
150.00 +250.00
137.50 +250.00
125.00 +250.00
Base cycle for T
250
375
750
125
500
375
375
125
250
750
125
Base cycle for T , T Base cycle for T
i o
[µs]
500
750
1250
250
1750
1000
750
1750
1250
750
2750
250
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
, T [µs] Base cycle for T
i o
T [µs]
mapc
250
750
750
250
500
750
750
250
250
750
250
Base cycle for T
dp
[µs] [µs]
500 2000
750 3000
1250 5000
250 1000
1750 7000
1000 4000
750 3000
1750 7000
1250 5000
750 3000
2750 11000
250 1000
Drive functions
,
dp
mapc