Siemens SINAMICS DCM Operating Instructions Manual page 382

Descriptions of functions
10.3 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 for the relevant PROFINET device in HW Config.
1. In HW Config, double-click the PROFINET interface item in the module.
2. Select the RT class under "RT class" on the "Synchronization" tab.
3. Once you have selected "IRT", you can also choose between "high flexibility" and "high
4. Confirm with "Update".
Synchronization domain
Taken as a whole, all of the devices that are to be synchronized form a synchronization
domain. The entire 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 subnetwork.
Example:
● Synchronization domain IRT: SIMOTION 2 with SINAMICS
● SINAMICS, which is assigned to the IO system of SIMOTION 1, is arranged in the
Figure 10-29 RT communication across the limits of synchronization domains
380
The "Properties" dialog opens.
performance".
topology in such a way that its RT communication must be conducted through the IRT
synchronization domain.
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
SINAMICS DCM DC Converter