ID 442710.00 25WE KEEP THINGS MOVING
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Operation manual PROFINET
6.3 PROFIdrive device profile
PROFIdrive is a profile for electric drives that was developed with the aim of
standardizing the PROFIBUS and PROFINET interface across manufacturers:
data flows, telegrams, standard configurations and options to access
parameters or diagnostic data are specified in detail in PROFIdrive.
Devices from different manufactures obtain an extremely unique
characterization via PROFIdrive and feature compatible behavior.
6.4 Cyclic and acyclic data transfer
IO controllers control and regulate data communication with IO devices.
A controller cyclically transfers time-critical data such as control information to
the devices and receives current status signals from them.
In addition the controller and device acyclically exchange non-time-critical data
such as parameter values to be configured or one-off events.
Both communication services run in parallel whereby the cyclic data has a
higher priority. If required, an acyclic telegram is interlaced in each cyclic data
exchange which hardly affects the bus speed.
Communication relations and communication channels
To be able to exchange data, the IO controller and IO devices require a
precisely specified connection (Application Relation, AR). This connection is
the basis for different Communication Relations (CR), i.e. unique
communication channels must be defined within a connection that ultimately
realize the data exchange between controller and device.
PROFINET distinguishes between the following channels:
• IO Data CR
for the cyclic process data exchange (PZD channel),
• Record Data CR
for the acyclic parameter transfer (PKW channel),
• Alarm CR
for the transfer of alarms.
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