Siemens SINUMERIK 840D sl Configuration Manual page 98

Configuring networks
5.5 Configuring PROFINET IO with IRT
You can obtain these values automatically from the "NCK" isochronous OB or set them
manually.
Note
Restriction on the use of NCU Link
The combination of isochronous PROFINET NC peripherals (drives, inputs/outputs) and NCU-
Link is not supported.
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SINUMERIK STEP 7 Toolbox V15.1
Configuration Manual, 12/2018, A5E46279635B AA