Siemens SINUMERIK 840D sl Configuration Manual page 105

Procedure
To configure devices for isochronous operation, proceed as follows:
1. Switch to the device view of the PROFINET IO IRT device and select it.
2. Select in the "Properties > General" inspector window under "PROFINET interface >
Extended options" the port (e.g. Port [X1 P1]).
3. Select a specific port on the PLC in the "Partner port" dropdown list in the "Port
interconnection" section: "Port_1" (X150 P1) or "Port_2" (X150 P2).
Figure 5-3 Example port interconnection
The selected port of the device is interconnected with the appropriate port of the PLC.
(Alternatively, you can make the port interconnection between devices graphically in the
topology view.)
4. In the "Cable length" dropdown list, enter the length of the actual cable in order to minimize
the signal run time.
5. Switch in the sector tree of the inspector window to the "PROFINET interface > Extended
options > Isochronous mode" entry.
6. Activate the "Isochronous operation" checkbox.
The isochronous operation of the device is activated and concurrently the synchronization
role of the device set to "sync slave" and the RT class set to "IRT" in the sync domain.
SINUMERIK STEP 7 Toolbox V15.1
Configuration Manual, 12/2018, A5E46279635B AA
Configuring networks
5.5 Configuring PROFINET IO with IRT
105