Communication according to PROFIdrive
3.1 PROFIdrive application classes
Communication
34 Function Manual, 12/2018, 6SL3097-5BD00-0BP0
3.1 PROFIdrive application classes
There are different application classes for PROFIdrive according to the scope and type of the
application processes. PROFIdrive features a total of 6 application classes, the 3 most
important are compared here.
● Class 1 (AK1):
The drive is controlled using a speed setpoint via PROFIBUS/PROFINET. In this case,
speed control is fully handled in the drive.
Typical application examples include simple frequency converters for controlling pumps
and fans.
● Class 3 (AK3):
In addition to the speed control, the drive also includes a positioning control, which
means that it operates as an autonomous single-axis positioning drive while the higher-
level technological processes are performed in the control system. Positioning requests
are transferred to the drive controller via PROFINET (or PROFIBUS) and started.
● Class 4 (AK4):
This PROFIdrive application class defines a speed setpoint interface, where the speed
control is realized in the drive and the closed-loop position control in the control system,
such as is required for robotics and machine tool applications with coordinated motion
sequences on multiple drives.
Motion control is primarily implemented using a central numerical controller (NC). The
position control loop is closed via the bus, i.e. the communication between the controller
and the drive must be isochronous.
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