Real-Time (Rt) And Isochronous Real-Time (Irt) Communication - Siemens SINAMICS S150 NEMA Operating Instructions Manual

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Cyclic communication using PROFINET IO with IRT or using RT is possible for all drive units

equipped with a PROFINET interface. This means that error-free communication using other

standard protocols is guaranteed within the same network.

CU320-2 DP and inserted CBE20

The cyclic process data channel for PROFIBUS DP is initially deactivated for a CU320-2 DP

and inserted CBE20. However, it can be reactivated with parameter p8839 = 1 at any time

(see Chapter "Parallel operation of communication interfaces (Page 433)").

PROFINET for drive technology is standardized and described in the following document:

• PROFIBUS profile PROFIdrive – Profile Drive Technology

Version V4.2, October 2015

PROFIBUS User Organization e. V.

Haid-und-Neu-Strasse 7, D-76131 Karlsruhe, Germany

http://www.profibus.com, Order Number 3.172

• IEC 61800-7

Real-time (RT) and isochronous real-time (IRT) communication

Real-time communication

When communication takes place via TCP/IP, the resultant transmission times may be too

long and not defined to meet the production automation requirements. When communicating

time-critical IO user data, PROFINET IO therefore uses its own real-time channel, rather

than TCP/IP.

Real time means that a system processes external events over a defined period.

Determinism means that a system will react in a predictable ("deterministic") manner.

With PROFINET IO with IRT, it is possible to precisely determine (predict) transmission

PROFINET IO with RT (Real Time)

Real-time data is treated with a higher priority than TCP(UDP)/IP data. Transmission of time-

critical data takes place at guaranteed time intervals. RT communication is the basis for data

exchange using PROFINET IO.

Enclosed Drives

Operating Instructions, 12/2018, A5E36652151A

6.9 Communication via PROFINET IO