Module-Internal Shared Input/Shared Output (Msi/Mso) - Siemens SIMATIC PROFINET Function Manual

5.3.4

Module-internal shared input/shared output (MSI/MSO)

Introduction
This section describes the module-internal shared input/shared output (MSI/MSO)
functionality for I/O modules that are operated on PROFINET.
Module-internal shared input/shared output functionality
The module-internal shared input (MSI) function allows an input module to make its input
data available to up to four IO controllers. Each controller has read access to the same
channels.
The following figure shows the MSI functionality.
①
②
③
④
⑤
Figure 5-28
The module-internal shared output (MSO) function allows an output module to make its
output data available to up to four IO controllers. An IO controller has write access to the
channels of the output module. Up to three IO controllers can additionally have read-access
to the channels.
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG
CPU 1516-3 PN/DP as IO controller
CPU 1511-1 PN as IO controller
Input module with MSI
Read access to the input channels of the input module
Write access to the channels of the I/O module (only with MSO)
Example configuration with MSI
Functions
5.3 Shared device
137