Siemens SINUMERIK 840D sl Commissioning Manual page 71

Settings for isochronous operation
NC-controlled drives connected via PROFINET must be operated isochronously with the same
cycle clocks (Tdp, Ti and To) as the drives, which are connected via the integrated PROFIBUS.
The cycle clock settings are made in STEP 7 (HW Config). For a SINUMERIK, times Ti and To
must match in the complete system.
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA
5.3 Extending the SIMATIC S7 project (PROFINET)
PLC commissioning
71