Siemens SIMATIC PROFINET Function Manual page 138

Functions
5.3 Shared device
The following figure shows the MSO functionality.
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②
③
④
⑤
Figure 5-29
Advantages of MSI/MSO
Module-internal shared input/shared output (MSI/MSO) offers the following advantages:
● Real-time acquisition in multiple CPUs
● Lower costs due to saving on additional IO devices and modules
● Lower space requirements due to saving on additional IO devices and modules
● Reduced communication load because no CPU-CPU communication is needed
● No additional programming effort is needed for CPU-CPU communication
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CPU 1516-3 PN/DP as IO controller
CPU 1511-1 PN as IO controller
Output module with MSO
Write access to the output channels of the output module
Read access to the output channels of the output module
Example configuration with MSO
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG