Communication
11.1 Communication according to PROFIdrive
Drive functions
734 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Properties of the Controller, Supervisor and drive units
Table 11- 2 Properties of the Controller, Supervisor and drive units
Send messages Permitted without external
Only possible on request by the
Receive messages Possible without any re-
Only receive and acknowledge
4 communication types are defined in the PROFIdrive profile:
● Cyclic data exchange via a cyclic data channel
Motion control systems require cyclically updated data in operation for open-loop and
closed-loop control tasks. This data must be sent to the drive units in the form of
setpoints or transmitted from the drive units in the form of actual values, via the
communications system. Transmission of this data is usually time-critical.
● Acyclic data exchange via an acyclic data channel
An acyclic parameter channel for exchanging parameters between the control/supervisor
and drive units is additionally available. Access to this data is not time-critical.
● Alarm channel
Alarms are output on an event-driven basis, and show the occurrence and expiry of error
states.
● Isochronous mode
– Cyclic data exchange in a fixed time grid
– The controller and device are synchronized
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