Siemens Simatic S7-1500 Manual page 22

Parameters/address space
4.4 Address space
Value status (Quality Information, QI)
The meaning of the value status depends on the submodule on which it occurs.
For the 1st submodule (=basic submodule), the value status 0 indicates that the value is
incorrect or that the IO controller of the basic submodule is in STOP state.
For the 2nd to 4th submodule (=MSO submodule), the value status 0 indicates that the value
is incorrect or one of the following errors has occurred:
● The basic submodule is not yet configured (not ready).
● The connection between the IO controller and the basic submodule has been interrupted.
● The IO controller of the basic submodule is in STOP or POWER OFF state.
The figure below 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 4-channel AQ 4xU/I ST MSO with value status
Analog output module AQ 4xU/I ST (6ES7532-5HD00-0AB0)
Manual, 09/2016, A5E03484696-AD