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5.4. Real-Time Class Selection
Both PROFINET real-time classes Real-Time (RT) and Isochronous Real-Time (IRT) Class 3 are supported.
Which one to use depends on the application and the used PLC.
5.4.1. Domain Management
The Domain Management determines the PROFINET bus properties.
Domain Management is accessed in the TIA Portal
®
by clicking the I/O system in the network view (here
„PN/IE_1“).
Enter selected synchronization clock in
„Sync-Domain_1“. The selected clock will be applied by PLC and
each device within this sync domain.
Select the PLC’s synchronization role as „Sync master“ (IRT) or “unsychronized” (RT) under „IO devices“ ,
together with the encoder’s real-time class.
5.4.2. Real-Time (RT) Class 1
In this class a typical cycle time of 100 ms or less is possible. The bus system allows for standard Ethernet
components.
Topology planning is not mandatory, but where implemented (e.
g. for retrieving feature „support device
replacement without exchangeable medium“) make sure ports P1/P2 are correctly assigned as projected.
