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Functions
5.6 PROFINET with performance upgrade
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
207
Setting limitation of the data infeed into the network for a CPU
To set the limitation of the data infeed into the network, follow these steps:
1.
In the network view of STEP 7, select the interface of the CPU.
2. In the Inspector window, go to "Properties" > "General" > "Advanced options" > "Interface
options".
3. Select or clear the "Limit data infeed into the network" check box.
Figure 5-59 Limit data infeed into the network
5.6 PROFINET with performance upgrade
Performance upgrade
The performance upgrade implements the application class "High Performance" of the
PROFINET specification V2.3.
The performance upgrade provides a series of measures that lead to the following
improvements for PROFINET with IRT:
•
Reduction of runtime delays in the IO devices
• Increase in the bandwidth for cyclic IO data
• Reduction of the bandwidth used for PROFINET frames
• Reduction of the send clocks
The improvements achieved with the performance upgrade mean that you can operate your
PROFINET IO system with more devices with the same send clock or the same number of
devices with a shorter send clock.
With PROFINET, it was previously possible to reach a send clock of 250 µs.
With the performance upgrade, it is now possible to achieve isochronous send clocks of up to
125 µs with the fast forwarding, dynamic frame packing and fragmentation procedures,
depending on the performance capability of the CPU (see Technical Specifications in the
device manuals). With short send clocks, standard communication remains possible.
The performance upgrade will help you to implement applications with high speed and send
clock requirements.