Siemens SIMATIC ET 200AL - I-Device Functionality; Intelligent IO Devices (I-Devices)

Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7 V15
118 Function Manual, 12/2017, A5E03444486-AH
5.2
Intelligent IO devices (I-devices)
5.2.1
I-device functionality
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 preprocessing is handled by the user program in the I-device. The process values
acquired in the centralized or distributed (PROFINET IO or PROFIBUS DP) I/O are
preprocessed by the user program and made available to the IO controller.
Figure 5-6 I-device
"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".
Application example: Configuration and application of the PROFINET I-device function
A detailed application example is available here
(https://support.industry.siemens.com/cs/ww/en/view/109478798
).