Communication
11.2 PROFINET
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
931
Data exchange between higher- and lower-level IO system
Transfer areas are an interface to the user program of the I-device CPU. Inputs are
processed in the user program and outputs are the result of the processing in the user
program.
The data for communication between IO controller and I-device is made available in the
transfer areas. A transfer area contains an information unit that is exchanged consistently
between IO controller and I-device. You can find more information on configuration and use
of transfer areas in the section "Configuring the I-device".
The next figure shows the data exchange between the higher- and lower-level IO system.
The individual communication relations are explained below based upon the numbers:
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