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

● SINAMICS S120 with CU310 with integrated PROFINET interface
● SINAMICS S120 with CU320 and plugged CBE20
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.
Note
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
CAUTION
The cyclic PZD channel for PROFIBUS DP is initially deactivated when the CBE20 is
plugged in. It can however be activated again with parameter p8839 (see section "Parallel
operation of communication interfaces with CU320").
10.3.1.2

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
Determinism means that a system will react in a predictable ("deterministic") manner.
With PROFINET IO, it is possible to precisely determine (predict) transmission times.
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Communication PROFIBUS DP/PROFINET IO
10.3 Communication via PROFINET IO
519