Rt Classes For Profinet Io - Siemens sinamics dcp Operating Instructions Manual

Operation
8.6 Communication via PROFINET IO
device is the redundancy manager. The redundancy manager monitors the data telegrams in
the PROFINET ring. All other connected PROFINET nodes are redundant clients.
The Media Redundancy Protocol (MRP) is the standard procedure for media redundancy.
Using this procedure, a maximum of 50 devices can participate in each ring. In the case of
an interrupted cable, data transfer is only briefly interrupted as the system switches over to
the redundant data path.
If a short-term interruption is not permitted, data transfer must be set to IRT High
Performance. The uninterruptible MRRT is automatically set.
From a CBE20, only the first two ports are capable of establishing a ring topology.
Configuring media redundancy
The ring topology is configured by appropriately configuring the participating devices
individually in STEP 7.
8.6.4

RT classes for PROFINET IO

PROFINET IO is a scalable realtime communication system based on Ethernet technology.
The scalable approach is expressed with three realtime classes.
RT
RT communication is based on standard EtherNet. The data is transferred via prioritized
EtherNet telegrams. Because standard EtherNet does not support any synchronization
mechanisms, isochronous operation is not possible with PROFINET IO with RT!
The real update cycle in which cyclic data is exchanged depends on the bus load, the
devices used and the quantity framework of the I/O data. The update cycle is a multiple of
the send cycle.
IRT
Two options are available with this RT class:
● IRT "high flexibility"
● IRT "high performance"
Is not supported by SINAMICS DCP.
Software preconditions for configuring IRT:
● STEP 7 5.4 SP4 (HW Config)
Note
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.
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Operating Instructions, 05/2016, A5E34382853K
SINAMICS DCP