Siemens SIMATIC ET 200AL, System Manual

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Functions
5.3 Shared device
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
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4. In the "Shared Device" area, set the number of project-external IO controllers. The maximum
number depends on the IO device (specification in GSD file).
5. You must set the same send clock for each IO controller that has access to modules and
submodules of the shared device:
– If you configure the IO controller with STEP 7 (TIA Portal):
Open the corresponding project.
Select the PROFINET interface of the IO controller.
Select the "Advanced options > Real time settings > IO communication" area in the
Inspector window and set the shared send clock.
– If you configure the IO controller with a different engineering tool:
Select the PROFINET interface of the shared device in STEP 7 (TIA Portal) and read out
the send clock on the shared device ("Advanced options > Real time settings" area)
Enter the read send clock in the engineering tool.
– Special consideration: If you configure all IO controllers that have access to the shared
device in STEP 7 (TIA Portal or V5.5), you can set shorter send clocks on the IO
controller than supported by the shared device (send clock adaptation).
Compiling and loading
You must compile the configurations for the different IO controllers and load them to the
CPUs one after the other.
Due to the distributed configuration with separate projects, STEP 7 does not output
consistency errors in the case of incorrect access parameter assignment. Example for
incorrect access parameter assignment:
•
Several IO controllers have access to the same module
• IP address parameters or send clocks are not identical
These errors do not show up until operation and are output as configuration errors, for
example.
Note
After a configuration has been loaded in the IO controller, non-assigned modules or
submodules retain their current parameterization state to ensure the independence from the
parameterizations of other IO controllers.