Siemens SIMATIC ET 200AL, System Manual

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Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
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Application examples
From a machine OEM's point of view, there are numerous device options possible in series
production of machines . However, each delivered machine includes only one combination
of selected options. All possible machine options can be configured as I-devices by the
manufacturer to create and maintain a common user program having all possible options.
A higher-level IO controller used for line control, for example, is not necessary in every
machine. In this case, the user program can disable the I-device function in the I-device CPU
with the instruction "D_ACT_DP", for example, during startup.
Two production lines are shown schematically in the figure below. The same user program
runs in both CPUs with I-device configuration. The I-device in line 1 is controlled by a higher-
level IO controller.
① Higher-level IO controller
② ... controls I-device CPU S7-1500 in the line
③ I-device function is enabled in the user program of this CPU
④ I-device function is disabled in the user program of this CPU
⑤ IO devices
Figure 5-21 Enable/disable the I-device function in the I-device CPU