Siemens S7-1200 - Configuring a CPU and PROFINET Idevice; I-Device Functionality

Communication
10.2 PROFINET
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
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10.2.7
Configuring a CPU and PROFINET iDevice
10.2.7.1
I-device functionality
The "I-device" (intelligent IO device) functionality of a CPU facilitates data exchange with an
IO controller and operation of the CPU as intelligent preprocessing unit of sub processes, for
example. The I-device is linked as an IO device to a "higher-level" IO controller.
The pre-processing is handled by the user program on the CPU. The process values
acquired in the centralized or distributed (PROFINET IO or PROFIBUS DP) I/O are pre-
processed by the user program and made available through a PROFINET IO interface to the
CPU of a higher-level station.
"I-device" naming conventions
In the remainder of this description, a CPU or a CP with I-device functionality is simply called
an "I-device".