Siemens SIMATIC ET 200AL, System Manual

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Functions
5.13 Accelerating startup
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
4. Select the "Prioritized startup" check box.
Figure 5-113 Configuring prioritized startup in STEP 7
5. Download the configuration to the IO controller.
Note
Prioritized startup after a startup for the first time
A prioritized startup of the IO device is always available to you after the first configuration
of this IO device in the very first startup of the PROFINET IO system. Even in the case of
spare parts or a reset to factory settings, the first startup is a standard startup for the
respective configured IO devices.
Note
Number of IO devices (distributed I/O) with prioritized startup
You can only start up a maximum number of IO devices with the "Prioritized startup"
PROFINET functionality within one PROFINET IO system. This maximum number depends
on the IO controller used.
5.13.4 Optimize the port settings
Optimizing port settings on the IO device and IO controller
The transfer medium and the duplex option are checked during startup of the IO device in the
case of copper cabling.
These checks require time, but with specific presets of these options you can save the time
the check requires. Make certain that the settings made correspond to the actual conditions
(using the correct cables).