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

IO devices: Drive units with PROFINET interface
● SINAMICS S120 with CU320-2 DP and inserted CBE20
● SINAMICS S120 with CU320-2 PN
● SINAMICS S120 with CU310-2 PN
Cyclic communication using PROFINET IO with IRT or using RT is possible on all drive units
equipped with a PROFINET interface. This means that error-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. Section 6
• IEC 61800-7
Note
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
Section "Parallel operation of communication interfaces (Page 701)").
10.3.1.1

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), 01/2013, 6SL3097-4AB00-0BP3
10.3 Communication via PROFINET IO
Communication
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