Siemens SINAMICS S120 Function Manual page 873

Drive functions

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Table 13- 27 Examples for cycle mixes for vector control

Base cycles for the isochronous PROFIBUS for a cycle mix with 250 μs

The speed controller cycle is assigned automatically when the current controller cycle is set:

• Servo control: Speed controller cycle = current controller cycle

• Vector control: Speed controller cycle = current controller cycle x 4

The preassignment of the speed controller cycle can be changed to influence T

example, the current controller cycle can be increased from 800 µs to 1000 µs so that T

can be set to be a multiple of 1000 µs.

Asynchronous node on the isochronous PROFIBUS

For cycle mix, lengthened base cycles with the following effects often result on the

isochronous PROFIBUS:

● Because the isochronous PROFIBUS can no longer be operated with the default setting,

● The increased setting values for T

Despite a cycle mix, the parameter p2049 can be used to operate the axis with the different

current controller cycle asynchronously on the isochronous PROFIBUS. This allows the

default setting of the hardware configuration to be retained.

Drive functions

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

Cycle mix: Current controller

adaptations must be made to the hardware configuration.

dynamics of the position control loop.

Basic information about the drive system

13.10 System rules, sampling times and DRIVE-CLiQ wiring

Base cycle for T

Base cycle for T

have disadvantageous effects on the

Base cycle for T

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