DAD 143.x User Manual Profinet Rev.1.1.1 March 2023 Page 70 of 95
15 Acyclic Data Transfer - ProfiNet
The parameters and variables in the DAD 143.x can also be read and written using acyclic read* / write
record* requests. These requests require a single index for addressing the parameters. Appendix C contain a
list of all the parameters and variables in the DAD. The index / subindex addressing used in other cases are
here extended with a combined index for use with Profinet acyclic requests. Read / write requests must be
sent to Slot 1, Subslot 1 and always use a data length of 4 bytes.
* Refe
application for reading and writing acyclic commands.
15.1 Acyclic read example
An acyclic read of the DAD serial number, using a Profinet master simulator from Bihl+Wiedemann GmbH,
Germany, is shown below:
Serial number = 0x000005E3 = 1507
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