Real-Time (Rt) And Isochronous Real-Time (Irt) Communication - Siemens Sinamics S120 Function Manual

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Cycle communication using PROFINET IO with IRT or using RT is possible on all drive units

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

other standard protocols is guaranteed within the same network.

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

PROFIBUS profile PROFIdrive - Profile Drive Technology

Version V4.1, May 2006,

PROFIBUS User Organization e. V.

Haid-und-Neu-Straße 7,

D-76131 Karlsruhe

http://www.profibus.com,

Order no. 3.172, spec. Chapter 6

• IEC 61800-7

For CU320-2 DP with inserted CBE20, the cyclic PZD channel for PROFIBUS DP is

deactivated. When setting parameter p8839 = 1, the PZD channel can be reactivated (see

Chapter "Parallel operation of communication interfaces").

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 non-deterministic to meet production automation requirements. When

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

channel, rather than TCP/IP.

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

With PROFINET IO, it is possible to precisely determine (predict) transmission times.

PROFINET IO with RT (Real Time)

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

Drive functions

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

10.3 Communication via PROFINET IO

Communication

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