Siemens SINAMICS S120 Function Manual page 530

Communication PROFIBUS DP/PROFINET IO
10.3 Communication via PROFINET IO
4) Isochronous operation is not compatible with IRT "high flexibility".
5) Uneven send cycles can be used only if the IO systems assigned to the synchronization
domain do not include any RT or IRT "high flexibility" devices.
Furthermore, the send cycles which can actually be set are determined by the intersection
between the send cycles supported by all the devices in the synchronization domain.
The reduction ratio between the update cycle of an IO device and the send cycle is set in the
"Properties" of the PROFINET interface for the relevant device.
Send cycles for SINAMICS drive units
A SINAMICS drive unit with PROFINET interface which supports IRT*/IRT permits send
cycle settings of between 0.5 ms to 4.0 ms in a 250 µs time frame.
Topology rules
Topology rules for RT
● A topology can be, but need not be configured for RT. If a topology has been configured,
● Otherwise, the wiring between devices is entirely optional.
Topology rules for IRT* and IRT
● Mixed operation is not supported by STEP 7 V5.4 SP4, i.e. IRT "high performance"
● A synchronization domain with IRT*/IRT "high performance" can contain a maximum of
● IRT "high flexibility" is subject to the same topology rules as IRT*/IRT "high performance",
Device selection in HW Config
Hardware catalog:
The drive unit from the appropriate device family entry in the hardware catalog must then be
configured. These are all the entries with end identifier ...PN-V2.2 for RT class IRT. The
remaining entries are for RT class IRT*.
GSD:
Two GSD files are also available (one each for IRT* and IRT) for SINAMICS firmware
versions V2.5 SP1 Hotfix 10 and V2.6. The names of GSD files for devices which contain
IRT end in ...PN-V2.2.
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the devices must be wired in accordance with the topology.
cannot be combined with IRT "high flexibility" in the same synchronization domain.
one IRT*/IRT "high performance" island. "Island" means that the devices must be
interconnected to match the configured topology. A synchronization master must be
positioned in the relevant island.
the only exception being that a topology need not be configured. However, if a topology
has been configured, the devices must be wired to match the topology.
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions