Communication
11.2 PROFINET
S7-1200 Programmable controller
930 System Manual, V4.2, 09/2016, A5E02486680-AK
Example: I-device as IO device and IO controller
The I-device as IO device and IO controller is explained based on the example of a print
process. The I-device controls a unit (a subprocess). One unit is used, for example, to insert
additional sheets such as flyers or brochures in a package of printed material.
Unit 1 and unit 2 each consist of an I-device with centralized I/O. The I-device along with the
distributed I/O system (for example, ET 200) forms unit 3.
The user program on the I-device is responsible for preprocessing the process data. For this
task, the user program of the I-device requires default settings (for example, control data)
from the higher-level IO controller. The I-device provides the higher-level IO controller with
the results (for example, status of its subtask).
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