Siemens Simatic ET 200MP Manual page 24

Parameters/address space
4.2 Address space
For the 2nd to 4th submodule (=MSI submodule), the value status 0 indicates that the value
is incorrect or the basic submodule has not yet been configured (not ready).
The following figure shows the assignment of the address space with submodules 1 and 2
and the value status.
Figure 4-3 Address space for configuration as 1 x 32-channel DI 32x24VDC HF MSI with value status
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DI 32x24VDC HF digital input module (6ES7521-1BL00-0AB0)
Manual, 09/2016, A5E03485935-AF