Siemens SINAMICS G120 Operating Instructions Manual page 82

Functions
5.1 Overview of inverter functions
Functions relevant to all applications
The functions that you require in each application are located at the center of the function
overview above.
The parameters of these functions are provided with a matching basic setting during quick
commissioning so that in many cases, the motor can be operated without requiring additional
parameterization.
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Inverter control is responsible for all of the other inverter functions. Among
other things, it defines how the inverter responds to external control signals.
The command source defines from where the control signals are received to
switch-on the motor, e.g. via digital inputs or a fieldbus.
The setpoint source defines how the speed setpoint is for the motor is
entered, e.g. via an analog input or a fieldbus.
The setpoint calculation uses a ramp-function generator to prevent speed
steps occurring and to limit the speed to a permissible maximum value.
The motor closed-loop control ensures that the motor follows the speed
setpoint.
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA