Error: The PROFINET controller '...' cannot operate in IRT mode.
The controller used does not support Isochronous RealTime (IRT) for your PROFINET network. Some connected PROFINET devices, however, run in IRT mode.
Remedy
Either remove the IRT devices or select the RT class 'RT' in order to switch them to RealTime (RT) mode. This is done in the 'Interface' editor of the device.
To open this editor, double-click the corresponding 'Interface' node in the PLANT.
Example:
