Rt Classes For Profinet Io - Siemens SINAMICS S120 Function Manual

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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 communication is based on standard Ethernet. The data are 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-

time capability is comparable with the present PROFIBUS DP solutions with 12 MBaud, i.e. a

sufficiently large bandwidth portion is available for the parallel transmission of IT services on

the same line.

The real update cycle in which cyclic data are 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.

Previous RT class IRTtop.

Two options are available with this RT class:

● IRT "high flexibility"

● IRT "high performance".

Software requirements for configuring IRT:

● STEP 7 5.4 SP4 (HW Config)

● SINAMICS firmware version 2.5 SP1 Hotfix 10 or 2.6.

The software requirements for IRT are also applicable for the configuration of RT class IRT*.

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

I/O device, please refer to document: SIMOTION SCOUT Communication System Manual.

Drive functions

Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5

Communication PROFIBUS DP/PROFINET IO

10.3 Communication via PROFINET IO