Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
125
I-device with lower-level PROFINET IO system
Depending on the configuration, an I-device can also be an IO controller on a PROFINET
interface in addition to having the role of an IO device.
This means that the I-device can be part of a higher-level IO system via its PROFINET interface
and as an IO controller can support its own lower-level IO system.
The lower-level IO system can, in turn, contain I-devices (see figure below). This makes
hierarchically structured IO systems possible.
In addition to its role as IO controller, an I-device can also be used via a PROFIBUS interface as
DP master for a lower-level PROFIBUS system.
Figure 5-8
I-device with lower-level IO system
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