Siemens SIMATIC PROFINET Function Manual page 126

Functions
5.3 Shared device
Select the setting "---" for all modules and submodules that are to be located in the
address range of the CPU from the "Shared-Device-2" project (PLC2). This means that
an IO controller outside the project is to have access to the module or submodule.
Figure 5-22 Configuring shared device
4. Select the interface module in the network view or device view of project "Shared-
Device-2".
5. Select the "Shared Device" area in the Inspector window.
A table shows which CPU has access to the respective module or submodule for all
configured modules.
6. Select the setting "---" for all modules and submodules that are to be located in the
address range of the CPU from the "Shared-Device-1" project (PLC1).
7. Finally, check whether the settings for access are "complementary" for each module or
submodule in both projects. This means that if the local CPU has access in one project,
the option "---" must be set in the other project and vice versa.
Special consideration: The option "---" for the PROFINET interface and therefore for the
ports makes the associated parameters read-only and not changeable. Parameters of the
PROFINET interface and port parameters can only be edited in the project in which the
PROFINET interface is assigned to the local CPU. The ports can be interconnected in
both projects regardless of this.
8. Check whether the same IP address parameters and device name are set for the shared
device in all projects.
Check whether the same S7 subnet ID is set in all projects for the subnet to which the
shared device is connected (subnet properties, "General" area in the Inspector window).
Note
If you make changes to the shared device: Make the same changes in each project on
the shared device. Make sure that only one IO controller has access to a module or
submodule.
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PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG