Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
133
Rules for the Topology of a PROFINET IO System with I-Device
Introduction
The following recommendations for the structure and configuration of an IO system when
using I-devices will help you to keep the bandwidths required for keeping communication
small.
The following communication paths should not overlap:
● Communication paths between the IO controller and the IO device of its IO system.
● Communication paths of the I-device CPU and the IO devices of your IO system.
Connect an I-device with only one port to a PROFINET switch that is uncoupled from the
higher-level IO system. Connect the lower-level IO system to another port of the switch as
shown in the following figure.
Figure 5-17 I-device with one port
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