Siemens SINAMICS DCM Manual page 467

Descriptions of functions
10.5 Communication via PROFINET IO
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. Chapter 6
• IEC 61800-7
Note
For a CUD with inserted CBE20, the cyclic PZD channel is deactivated for PROFIBUS DP.
By setting parameter p8839 = 1, the PZD channel can be reactivated, see Chapter Parallel
operation of communication interfaces (Page 412).
10.5.2.1 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.
PROFINET IO with RT (Real Time)
Real time means that a system processes external events over a defined period.
Process data and alarms are always transferred in real time (RT) within the PROFINET IO
system. RT communication provides the basis for data exchange with PROFINET IO. 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.
468
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
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