Siemens SINAMICS S120, Function Manual

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Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
61
Extended setpoint channel
3
3.1 Fundamentals
In servo control, the extended setpoint channel is deactivated through the factory setting. If
an extended setpoint channel is required, it has to be activated (see Chapter "Activating the
function module for servo control (Page 61)").
The extended setpoint channel is always activated in vector control.
Properties of servo control without the "extended setpoint channel" function module
● The setpoint is directly interconnected to p1155[D] (e.g. from a higher-level controller or
technology controller)
● Dynamic Servo Control (DSC) only
When using DSC, the "extended setpoint channel" is not used. This unnecessarily uses
the computation time of the Control Unit and, for servo control, can be deactivated.
● Deceleration ramp OFF1 via p1121[D]
The deceleration ramp in p1121 is also effective when the "Extended setpoint channel" is
deactivated.
● Deceleration ramp OFF3 via p1135[D]
● For PROFIdrive telegrams 2 to 103 and 999 only (free assignment)
● STW 1 bit 5 (freeze ramp-function generator), no function
3.1.1 Activating the function module for servo control
In servo control, the "extended setpoint channel" function module can be activated via the
commissioning wizard or the drive configuration (configure DDS).
You can check the current configuration in parameter r0108.8. Once you have set the
configuration, you have to download it to the Control Unit where it is stored in a non-volatile
memory (see the SINAMICS S120 Commissioning Manual with STARTER).
Note
When the "extended setpoint channel" function module for servo control is activated, under
certain circumstances, the number of drives in the multi-axis group that can be controlled
from a Control Unit is reduced.