Efficient Networks Siemens Sinamics S120 - Manual (Page 346)

Communication PROFIBUS DP/PROFINET IO
10.1 Communications according to PROFIdrive
Drive Functions
346
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Application class 4 (central motion control)
This application class defines a speed setpoint interface with execution of the speed control
on the drive and of the positioning control in the controller, such as is required for robotics
and machine tool applications with coordinated motions on multiple drives.
Motion control is primarily implemented by means of a central numerical controller (CNC).
The position control loop is closed via the bus. The synchronization of the position control
cycles in the control and in the closed-loop controllers in the drive requires a clock
synchronization of the kind that is provided by PROFIBUS DP and PROFINET IO with IRT.
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Figure 10-4 Application class 4
Dynamic Servo Control (DSC)
The PFOFIdrive profile contains the "Dynamic Servo Control" control concept. This can be
used to significantly increase the dynamic stability of the position control loop in application
class 4 with simple means.
For this purpose, the deadtime that is typical for a speed setpoint interface is minimized by
an additional measure (see also chapter "Dynamic Servo Control").
Selection of telegrams as a function of the application class
The telegrams listed in the table below (see also chapter "Telegrams and process data") can
be used in the following application classes: