AUMA ACE C 01.2 Profinet Series Manual page 37

Actuator controls
AC 01.2/ACExC 01.2 Profinet
4.3. Profinet services
Information
4.4. Redundancy
Acyclic data
Actuators controls with Profinet grant access to the contents of the device identification
data, the operational information, and the most important parameters for setting and
the maintenance information. Access to the data of all actuators connected within
the Profinet network is therefore enabled for predictive, condition-based maintenance
or uniform parameter setting. This acyclic data exchange is performed via UDP with
lower priority than the process data exchange.
For integration of the accessible device-specific information via Profinet, data and
parameters into the engineering station, either a Device Type Manager (DTM),
Electronic Device Description (EDD) or an FDI package is required depending on
the control system.
Failure to order actuator controls with this characteristic requires prior enabling and
activating the acyclic communication.
The media redundancy available for Profinet warrants for high availability within the
plant. The actuator is equipped with two physically isolated communication ports to
the host controller and can be connected within a simple ring topology. If the first
channel fails, e.g on the basis of line interruption, the second communication channel
is automatically used. For this, the Media Redundancy Protocol as defined in the
Profinet Standard is used. It allows the establishment of a redundant and protocol
independent ring topology whereby the change-over time is less than 50 ms. MRP
is defined in the IEC 62439 standard.
Figure 6: Profinet redundancy
This deals with a redundancy of the transmission medium. The Profinet interface of
the device is not available twice.
Description of the data interface
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