Siemens SIMATIC ET 200AL, System Manual

Page: 1736 / 2255

Functions
5.3 Shared device
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
171
MSO submodules
During MSO configuration of an output module, the output values of all channels of the
module are copied from a basic submodule to up to three other MSO submodules. The
channels of the module are then available with identical values in the basic submodule and
the MSO submodules. The MSO submodules can be assigned to up to three IO controllers
when the module is used in a shared device.
•
The IO controller to which the basic submodule is assigned has write access to the outputs
of the module. The basic submodule therefore occupies output addresses in the process
image of the IO controller.
• The IO controllers to which the MSO submodules are assigned have read access to the
outputs of the module. MSO submodules therefore occupy input addresses in the process
image of the IO controller.
The following figure shows a digital output module with the basic submodule and three
MSO submodules. Each submodule is assigned to an IO controller. Diagnostics and parameter
assignment of the digital output module can be performed from IO controller 1 via the basic
submodule.
① Write access
② Read access
③ Parameter assignment and system diagnostics
Figure 5-34 DQ module with MSO submodule