Siemens SINAMICS S120 Function Manual page 626

Communication
10.1 Communication according to PROFIdrive
Application class 2 (standard drive with technology function)
The total process is subdivided into a number of small subprocesses and distributed among
the drives. This means that the automation functions no longer reside exclusively in the
central automation device but are also distributed in the drive controllers.
Of course, this distribution assumes that communication is possible in every direction, i.e.,
also cross-communication between the technology functions of the individual drive
controllers. Specific applications include setpoint cascades, winding drives, and speed
synchronization applications for continuous processes with a continuous web.
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Figure 10-2
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Application class 2
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Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions