Siemens SINUMERIK 840D sl Configuration Manual page 91

Note
Concurrent operation of devices with and without clock synchronization
When you configure devices that do not participate on the IRT communication, observe the
rules for sync domains for PROFINET IO IRT (Page 97).
Procedure
To configure the NC of the NCU to use isochronous mode, proceed as follows:
1. Select the PLC of the NCU.
2. Select the "Alarms > Isochronous alarms > NCK" entry in the "Properties > General"
inspector window.
3. In the "Distributed I/O" dropdown list, select the PROFINET IO system with which you
have interconnected the PROFINET IO IRT devices (e.g. "PROFINET IO system (100)").
Note
Changing the name and number of the PROFINET IO system
You can specify the name and number of the PROFINET IO system in the settings of the
IO system (bus system on X150). You find the setting under "General" provided IO
system is highlighted in the network view.
If, however, the sync domain or nothing is highlighted, the setting is not available.
To highlight the IO system, position the mouse cursor over the IO system in the network
view and activate the appropriate option box in the displayed tooltip.
4. In the "Application cycle (ms)" dropdown list, select the value that you defined as send
clock of the sync domain and the DP cycle of SINAMICS Integrated, e.g. 2000.
5. Enter "2" in the "TPA" (subprocess image) text field. The setting must match the "process
image" setting on the IO modules.
SINUMERIK STEP 7 Toolbox V14 SP1
Configuration Manual, 05/2017, A5E41846325
Configuring networks
4.5 Configuring PROFINET IO with IRT
91