Extending The Simatic S7 Project (Profinet); Requirements When Configuring Profinet - Siemens SINUMERIK 840D sl Commissioning Manual

PLC commissioning

5.3 Extending the SIMATIC S7 project (PROFINET)

5.3 Extending the SIMATIC S7 project (PROFINET)
5.3.1

Requirements when configuring PROFINET

PROFINET IO IRT (Isochronous Real Time)
I/O modules and drives can use the isochronous PROFINET IO IRT. In addition to IRT, an RT
communication is also possible by default.
PROFINET IO IRT can be used by the PLC as PLC I/O and also by the NC. Drives are typically,
but not exclusively, configured as isochronous devices for use by the NC. The PROFINET IO
IRT devices operated isochronously by the PLC are typically I/O stations.
The concurrent operation of IRT "high performance" and CBA on the same PROFINET bus
interface is not supported. This means either NC drives via PROFINET IO with IRT or system
coupling via PROFINET CBA can be operated on an NCU.
The combination of isochronous PROFINET NC peripherals (drives, inputs/outputs) and NCU-
LINK is not supported.
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CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA