Siemens SINAMICS S120 Function Manual page 1010

Basic information about the drive system
13.12 System rules, sampling times and DRIVE-CLiQ wiring
The following supplementary conditions must be observed for isochronous operation:
● The PROFIBUS cycle T
● The PROFIBUS cycle T
time.
● The times T
specification) must be integer multiples of 125 μs.
● The times T
● T
● Because T
are affected and run with the same setting.
● p0092 = 1 (isochronous operation preassignment/validation) sets default values for the
controller cycles for isochronous PROFIdrive operation during the initial commissioning.
– The current controller sampling times from "Table 13-14 Pulse frequencies and current
– The current controller sampling times from "Table 13-16 Pulse frequencies and current
● The setting rules for the safety actual value acquisition cycle and the safety monitoring
cycle must be observed (for details, see SINAMICS S120 Safety Integrated Function
Manual):
– The monitoring cycle (p9500) must be an integer multiple of the actual value
– Actual value acquisition cycle ≥ 4 × current controller sampling time.
– The DP cycle should be at least one current controller sampling time longer than the
The above conditions mean that the smallest common multiple of the current controller
sampling time of all axes operated on the isochronous PROFIBUS and 125 µs is used to set
T , T
i
If isochronous operation is not possible due to incorrect sampling time settings, an
appropriate message will be output (A01223, A01224).
Cycle settings for SINAMICS Link
SINAMICS Link permits only three cycle settings:
Table 13- 10 Settings for activated isochronous operation
1010
dp
dp
(time of incorporation of actual value) and T
i
and T must be an integer multiple of the current controller sampling time.
i o
is an integer multiple of the speed controller sampling time.
mapc
and T are always predefined for a PROFIBUS line, all drives of a Control Unit
i o
controller sampling times for servo control (Page 1026)" can be set for servo control.
controller sampling times for vector control (Page 1028)" can be set for vector control.
acquisition cycle (p9511). For p9511 = 0, the isochronous PROFIBUS cycle T
used as the actual value acquisition cycle.
sum of T and T .
i o
and T .
o dp
T [µs]
i
500
500
1500
must be an integer multiple of 250 μs.
must be an integer multiple of the current controller sampling
T [µs]
o
500
1000
1500
(time for setpoint value
o
T
dp
1000
1500
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
is
dp
[µs]
500
Drive functions