Siemens SIMATIC ET 200AL System Manual page 1106

Value status (Quality Information, QI)
The meaning of the value status depends on the submodule to which it pertains.
With basic submodule (= 1st submodule), the "0" value status indicates that the value is
incorrect.
With MSO submodule (= 2nd to 4th submodule) the "0" value status indicates that the value
is incorrect or one of the following errors has occurred:
● The basic submodule parameters have not yet been assigned (not ready for operation).
● 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.
Configuring I/O modules with MSI/MSO submodules
Requirements
● Configuration software STEP 7 as of V13
● IO device supports MSI/MSO (for example IM 155-5 PN ST as of firmware version 2.0.0)
Procedure
1. In the network view of STEP 7, insert an IM 155-5 PN ST interface module as of V2.0.
2. Double-click the IO device.
You are now in the device view.
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
Functions
5.3 Shared device
159