Siemens SIMATIC S7-1500 Manual page 15

Address space
4.1 Address space
Address space for configuration as 1 x 16-channel DI 16x230VAC BA MSI
The channels 0 to 15 of the module are copied in up to four submodules with configuration 1
x 16-channel module (Module-internal shared input, MSI). Channels 0 to 15 are then
available with identical input values in different submodules. These submodules can be
assigned to up to four IO controllers when the module is used in a shared device. Each IO
controller has read access to the same channels.
The number of usable submodules is dependent on the interface module used. Please
observe the information in the manual for the particular interface module.
Value status (Quality Information, QI)
The meaning of the value status depends on the submodule on which it occurs.
For the first submodule (=basis submodule), the value status is not relevant.
For the second to fourth submodules (=MSI submodule), the value status 0 indicates that the
basic submodule parameters have not yet been assigned (not ready).
The following figure shows the assignment of the address space with submodules 1 and 2.
Figure 4-3
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Address space for configuration as 1 x 16-channel DI 16x230VAC BA MSI
DI 16x230VAC BA Digital Input Module (6ES7521-1FH00-0AA0)
Manual, 07/2014, A5E03485975-AC