Siemens SIMATIC S7-1500 Manual page 35

The figure below shows the assignment of the address space with submodules 1 and 2.
Figure 4-6
Analog input module AI 8xU/I/RTD/TC ST (6ES7531-7KF00-0AB0)
Manual, 09/2016, A5E03484864-AD
Address space for configuration as 1 x 8-channel AI 8xU/I/RTD/TC ST MSI with value
status
Parameters/address space
4.4 Address space
35