5.5 Configuring PROFINET IO with IRT
5.5.1
Overview
IRT (Isochronous Realtime Ethernet) is a transmission method in which the PROFINET
devices are synchronized very precisely.
The following example configuring sequences serve as an aid for the configuring and provide
an overview of this chapter content.
● Configuring NC-controlled drives isochronously (handling overview) (Page 101)
● Configuring I/O used by NC isochronously (handling overview) (Page 102)
You can, however, make most settings for the clock synchronization in TIA Portal in any order.
You can orient yourself on the following notes:
● Isochronous modules identification in the hardware catalog (Page 99)
● Rules and requirements for clock synchronization (Page 97)
● Match values between PROFINET IO and PROFIBUS Integrated (Page 111)
● General information concerning isochronous mode is also contained in the TIA Portal online
help in Section "Configuring IRT communication".
If, instead, you want to operate drives or I/O isochronously via the PLC, proceed as for a CPU
S7-300. (Use the OB61 as isochronous alarm OB or the TPA1 as process image, and do not
enter the drive or I/O addresses in the machine data.)
5.5.2 Rules and requirements
Irrespective whether you configure isochronous I/O used by NC or isochronous NC-controlled
drives, the value of the TDP send clock must be identical in the complete system (all devices,
modules, submodules and bus systems):
● You can find these settings in the TIA Portal at the following locations:
– Properties of the PROFINET IO system under "Domain management > Sync domains >
Sync-Domain_x > Send clock".
– Properties of the PROFIBUS Integrated bus system under "Equidistance > DP cycle".
This applies, e.g. even when you connect drives via PROFINET as well as PROFIBUS
Integrated. The default setting of the PROFIBUS DP cycle (send clock) at the integrated
PROFIBUS is 2 ms.
During the configuring of drives, the values of the T
I
and T
O
times must also be identical in the
complete system:
● Properties of the IO device under "PROFINET interface > Extended options > Isochronous
mode".
● Properties of the bus system (e.g. PROFIBUS Integrated_1) under "Equidistance".
Configuring networks
5.5 Configuring PROFINET IO with IRT
SINUMERIK STEP 7 Toolbox V15.1
Configuration Manual, 12/2018, A5E46279635B AA 97
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