• Port-related statistics (PDEV)
• Automatic addressing (DCP)
• Media redundancy (MRP)
• Isochronous data exchange (IRT)
Cyclic data exchange
Cyclic data communication contains the data that the central processing unit sends to the IO
devices so that it can be output to the outputs as well as the data that an IO device reads in at
its inputs and sends to the central processing unit for processing. Non-isochronous data
exchange is called RT. RT telegrams are transferred directly via Ethernet.
Acyclic parameter data
Acyclic data communication consists of sending parameterization and conguration data to the
IO device on starting or sending a diagnostic message from the IO device to the central
processing unit during ongoing operation. Acyclic data uses UDP/IP.
Device diagnostics, alarms
Alarms are special acyclic messages that are sent from the IO device to the controller whenever
required. They are time-critical and therefore sent directly via Ethernet just like cyclic data.
Contrary to cyclic data, however, they must be conrmed by the recipient.
Besides generating standard alarms, the ATD430W generates a diagnostic alarm, based on the
GSD denition, in the event of disruptions on the internal SIDOOR bus.
I&M 0 and I&M 1 to 4
Device parameters can be read and written for device identication.
The data record for the unique identication of the IO device is the Identication and
Maintenance data record 0 (I&M 0 - device identication). This record is read-only.
The standardized records I&M 1 to 4 are intended for extended device identication. These can
be both read and written (on DAP).
Controllers
5.5 Relay and eldbus interfaces
ATD4xxW for industrial applications
System Manual, 06/2022, A5E51901827B AA 153
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