Siemens SIMATIC ET 200AL, System Manual

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Functions
5.6 PROFINET with performance upgrade
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
5.6.5 Sample configuration for IRT with high performance
The figure below shows an example configuration with which you can achieve maximum
performance.
Port 1 of the X1 interface of the CPU is deactivated.
Port 2 of the X1 interface and the ports of the interface modules on the bus use the following
setting: Medium copper, cable length < 20 m or signal delay max. 0.12µs
A programming device connection to the CPU can be established via the interfaces X2 and X3 of
the CPU or via the free port at the end of the line.
Figure 5-69 Example configuration for IRT with high performance
Use the following settings for the Sync domain:
•
Enable the "Make 'high performance' possible" option.
• Set the send clock to 125 µs.
• Enable the "Allows the use of ‘fast forwarding'" option.
Standard Ethernet communication for IRT with high performance
Standard Ethernet communication is still possible even in a PROFINET IO system with high
performance. Keep in mind that you first arrange the IRT nodes, as seen from the IO
controller, and arrange the standard Ethernet nodes at the end of the line.
With a large volume of data through standard Ethernet communication, it makes sense to
reduce the load on your network by separating standard Ethernet communication and cyclic
real-time communication. Example: Use the interface X1 for the PROFINET IO communication
and a different interface for the standard Ethernet communication.