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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Boundary conditions
The following boundary conditions result because a shared device configuration is distributed
across several projects:
•
The addresses of modules or submodules that are not assigned to this IO controller are
missing in the address overview of each IO controller that has access to a shared device.
• The modules or submodules that are not assigned are not taken into consideration in the
configuration limit calculation for the shared device during the consistency check. For this
reason, you must verify for yourself that the maximum number of submodules or the
maximum amount of cyclic IO data for the shared device will not be exceeded.
For information on the maximum quantities, refer to the documentation for the devices
you are using.
• Configuration errors such as the assignment of a module or submodule to several
IO controllers are not detected in STEP 7.
• CPUs that are loaded with a shared device configuration do not have any information on
whether the IO device is a shared device. Modules or submodules that are assigned to
other IO controllers and therefore other CPUs are missing in the loaded configuration.
These modules or submodules are therefore displayed neither in the CPU web server nor
in the CPU display.
Response in the event of fault
Information about how PROFINET IO controllers behave in the event of a fault when
accessing the data of a shared device is available in this FAQ
( https://support.industry.siemens.com/cs/ww/en/view/109572804 ).
5.3.2 Configuring shared device
Below, you will find a description of how to configure a distributed I/O system as a shared
device with STEP 7 V12, Service Pack 1 or higher.
A "distributed" configuration with different engineering tools for different IO controller
families is always possible. However, the description of the procedure is based solely on
STEP 7 as of V12, service pack 1. The description is limited to two IO controllers of the
S7-1500 family that share a shared device.
Two projects are created (Shared-Device-1 and Shared-Device-2), each with one IO controller
(PLC1 and PLC2). You must create the shared device in both projects, even though it is
physically one and the same IO device.
Requirements
• STEP 7 V12 Service Pack 1 or higher
• The IO controller supports the shared device function, for example CPU 1513-1 PN as of
firmware version 1.1.
• IO device supports shared device functionality, for example interface module
IM 155-5 PN ST as of firmware version 2.0.