Siemens SINAMICS S120 Function Manual page 778

Communication
10.3 Communication via PROFINET IO
Explanations for the above table:
It is only possible to set send cycles from the "even" range when IO devices with RT class
1)
"RT" are assigned to a synchronization domain. Likewise, only the reduction ratios from the
"even" range can be set for a send cycle setting from the "even" range.
It is generally only possible to set a reduction ratio of 1:1 between the update time and
2)
send cycle for IO devices (ET200S IM151-3 PN HS, SINAMICS S) which are operated in
isochronous mode. In this case, the update cycle mode must always be set to "fixed factor"
(under IO device properties, "IO cycle" tab, "Mode" pulldown menu). This means that STEP
7 will not automatically adjust the update cycle and thus the update cycle will always
correspond to the send cycle.
The send cycles from the "uneven" range can be set only if a synchronization domain does
3)
not include any IO devices with RT class "RT". Likewise, only the reduction ratios from the
"uneven" range can be set for a send cycle setting from the "uneven" range.
Isochronous operation is not compatible with IRT "high flexibility".
4)
Uneven send cycles can be used only if the IO systems assigned to the synchronization
5)
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 of
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 permits send cycle
settings of between 0.25 ms and 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
● Mixed operation is not supported by STEP 7 V5.4 SP4, i.e. IRT "high performance"
● A synchronization domain with IRT "high performance" can contain a maximum of one
● IRT "high flexibility" is subject to the same topology rules as IRT "high performance", the
776
the devices must be wired in accordance with the topology.
cannot be combined with IRT "high flexibility" in the same synchronization domain.
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.
only exception being that a topology does not need to be configured. However, if a
topology has been configured, the devices must be wired to match the topology.
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions