Cycle Mix For Servo Control And Vector Control - Siemens SINAMICS S120 Function Manual

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Basic information about the drive system

13.10 System rules, sampling times and DRIVE-CLiQ wiring

Using CUA31/CUA32

Information on using the Control Unit Adapter CUA31 or CUA32:

● CUA31/32 is the first component in the CUA31/32 topology: 5 axes

● CUA31/32 is not the first component in the CUA31/32 topology: 6 axes

● For a current controller cycle of 62.5 µs, only one axis is possible with one CUA31/32.

Cycle mix for servo control and vector control

Supplementary conditions

The rules for setting the sampling time (see Rules for setting the sampling time (Page 848))

and the rules on isochronous mode (see Rules for isochronous mode (Page 850)) apply.

These rules mean that the smallest common multiple of the current controller cycles of all

axes operated on the isochronous PROFIBUS and 125 µs is used to set T

Current controller cycles for cycle mix

Consequently the smallest common multiple of the current and speed controller cycles of all

axes operated on the isochronous PROFIBUS is used to set the base cycle for T

. For a cycle mix, a compromise must be sought between the base cycle to set T

, and the required pulse frequency.

Table 13- 26 Examples of cycle mixes for servo control

Cycle mix: Current controller cycles [µs]

Base cycles for the isochronous PROFIBUS for a cycle mix with 125 μs

Base cycle for T

Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4

Base cycle for T

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