Siemens SIMATIC ET 200AL, System Manual

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Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7
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5. Now you have the option of choosing the IO controller in the "Assigned IO controller" drop-
down list.
Once you have chosen the IO controller, the networking and the IO system between both
devices are displayed in the network view.
Figure 5-12 Configuring the I-device
6. With the "Parameter assignment of PN interface by higher-level IO controller" check box, you
specify whether the interface parameters will be assigned by the I-device itself or by a
higher-level IO controller.
If you operate the I-device with a lower-level IO system, then the parameters of the I-
device PROFINET interface (for example, port parameter) cannot be assigned with the
higher-level IO controller.