Siemens SINAMICS DCM Manual page 477

Descriptions of functions
10.5 Communication via PROFINET IO
Set the RT class
The RT class is set by means of the IO controller interface properties. If RT class IRT "high
performance" is set, it is not possible to operate any IRT "high flexibility" devices on the IO
controller and vice versa. IO devices with RT can always be operated, regardless of the IRT
class setting.
You can set the RT class in the HW Config for the associated PROFINET device.
1. In HW Config, double-click item PROFINET interface in the module.
The "Properties" dialog box opens.
2. Select the RT class under RT class on the "Synchronization" tab.
3. Once you have selected "IRT", you can also choose between option "high flexibility" and
"high performance".
Note
The "high performance" option must not be selected for SINAMICS DCM (an error
message is issued).
4. Confirm with "OK".
Synchronization domain
The sum of all devices to be synchronized form a synchronization domain. The whole
domain must be set to a single, specific RT class (real-time class) for synchronization.
Different synchronization domains can communicate with one another via RT.
For IRT, all IO devices and IO controllers must be synchronized with a common
synchronization master.
RT allows an IO controller to communicate with a drive unit outside a synchronization
domain or "through" another synchronization domain. As of version 5.4 SP1, STEP 7
supports multiple synchronization domains on a single Ethernet subnet.
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