Irt Communication: Types Of Synchronization - Siemens SIMATIC NET CP 443-1 Advanced Manual

There is a significant improvement in speed even in the following situations:
● Applications that generally require a fast start-up time for the IO devices after turning on
the power or following station failure/station return.
● When activating PROFINET IO devices.
Note
Longer start-up times despite prioritized startup
In the following situations, start-up times of up to 8 s may be experienced despite
prioritized startup:
• A PROFINET IO device is disconnected and reconnected within 8 s.
• At a docking point, several physical PROFINET IO devices are docked as one IO
Configuration for IO devices
You configure prioritized startup for the IO devices configured in the PROFINET IO system.
In STEP 7 select the properties of the PROFINET interfaces for the relevant IO devices.
Prioritized startup requires fixed port settings.
You will find further information on this in the system descriptions of PROFINET IO /19/
(Page 122) /20/ (Page 122).
Note
Changing the configuration - behavior on startup
After changing the configuration of an IO device to prioritized startup, the time required for
the first startup is just as long as without prioritized startup. All subsequent startups will then
be completed in the reduced time.
Note
Inclusion in the MRP ring topology impractical
Including an IO device with prioritized startup in a ring topology with media redundancy
serves no practical purpose since the ring is interrupted at each device change.
6.7.4

IRT communication: Types of synchronization

Within an IRT domain (Isochronous Real Time), you can use the CP for IRT communication.
The CP supports IRT communication with the IRT option "high-performance". The IRT option
"high-performance" optimizes data traffic as the result of topology planning.
The IRT option "high flexibility" is now only supported when a CP GX20 is replaced.
CP 443-1 Advanced (GX30)
Manual, 03/2019, C79000-G8976-C256-05
device with one specific device name and one specific IP configuration (for example at
a docking point for a driverless transport system).
Configuration and operation
6.7 PROFINET IO mode
75