2 Product description
15
2.1.9
PROFINET IRT
For PROFINET, a clock-synchronized data exchange by the transmission of data
packages in regular time intervals of a few hundred milliseconds up to four
milliseconds are defined by the IRT concept (isochronous real time).
The beginning of a bus cycle is adhered to with the highest precision (jitter <= 1
µ
s).
Each of the individual time intervals during the IRT communication is split into an
IRT interval and an open standard interval which requires the use of special
IRT switches.
INFORMATION
The SFB-PN module is no active participant in the IRT data exchange.
It supports the loss-free transmission of IRT telegrams for synchronized fieldbus
devices in the same Ethernet subnet.
INFORMATION
Information about the configuration of IRT can be found in the system manual of
your engineering software.