Siemens SINAMICS S120 Function Manual page 623

Properties of the Controller, Supervisor and drive units
Table 10- 2
Properties
As bus node
Send messages
Receive messages
● Drive unit (PROFIBUS: Slave, PROFINET IO: IO Device)
● Controller (PROFIBUS: Master Class 1, PROFINET IO: IO Controller)
● Supervisor (PROFIBUS: Master Class 2, PROFINET IO: IO Supervisor)
Communication services
Two communication services are defined in the PROFIdrive profile; namely, cyclic data
exchange and acyclic data exchange.
● Cyclic data exchange via a cyclic data channel:
● Acyclic data exchange via an acyclic data channel:
● Alarm channel
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Properties of the Controller, Supervisor and drive units
Example: CU320-2 Control Unit
A Controller is typically a higher-level control in which the automation program runs.
Example: SIMATIC S7 and SIMOTION
Devices for configuring, commissioning, operator control and monitoring while the bus is
in operation – and
devices, which only exchange non-cyclic data with drive units and Controllers.
Examples: Programming devices, human machine interfaces
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.
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.
Alarms are output on an event-driven basis, and show the occurrence and expiry of error
states.
10.1 Communication according to PROFIdrive
Controller Supervisor
Active
Permitted without external
request
Possible without any
restrictions
Communication
Drive unit
Passive
Only possible on request by the
Controller
Only receive and acknowledge
permitted
621