Siemens SINAMICS S120 Function Manual page 719

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Two options are available with this RT class:

● IRT "high flexibility"

● IRT "high performance"

The real-time classes IRT "high flexibility" and IRT "high performance" can be selected as

options in the synchronization settings configuration area of HW Config. In the description

below, both these classes are simply referred to as "IRT".

Software preconditions for configuring IRT:

● STEP 7 5.4 SP4 (HW Config)

For further information about configuring the PROFINET interface for the I/O controller and

I/O device, please refer to the following document: SIMOTION SCOUT Communication

System Manual.

IRT "high flexibility"

The telegrams are sent cyclically in a deterministic cycle (Isochronous Real Time). The

telegrams are exchanged in a bandwidth reserved by the hardware. One IRT time interval

and one standard Ethernet time interval are created for each cycle.

IRT "high flexibility" cannot be used for isochronous applications.

IRT "high performance"

In addition to the bandwidth reservation, the telegram traffic can be further tuned by

configuring the topology. This enhances the performance during data exchange and the

deterministic behavior. The IRT time interval can thus be further tuned or minimized with

respect to IRT "high flexibility".

In addition to the isochronous data transfer provided by IRT, even the application itself

(position control cycle, IPO cycle) can be isochronous in the devices. This is an essential

requirement for closed-loop axis control and synchronization via the bus. Isochronous data

transfer with cycle times well below one millisecond and with a deviation in the cycle start

(jitter) of less than a microsecond provide sufficient performance reserves for demanding

motion control applications.

In contrast to standard Ethernet and PROFINET IO with RT, the telegrams for PROFINET IO

with IRT are transferred according to a schedule.

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Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4

11.3 Communication via PROFINET IO

Communication

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