Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7 V15
124 Function Manual, 12/2017, A5E03444486-AH
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 (Page 125).
The next figure shows the data exchange between the higher- and lower-level IO system.
The individual communication relations are explained below based on the numbers.
Figure 5-11 Data exchange between higher- and lower-level IO system
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