Siemens SIMATIC ET 200AL System Manual page 1100

Procedure - Adjusting the real-time settings
To ensure that all IO controllers and shared devices are operated with the appropriate send
clock and that the update times are calculated correctly based on the communication load,
you must adjust and check the following settings:
1. 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):
– If you configure the IO controller with a different engineering tool:
– Special consideration: If you configure all IO controllers that have access to the
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.
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
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.
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.
shared I-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).
Functions
5.3 Shared device
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