Reference
Setting the input/output addresses in the "Properties > General > I/O addresses" parameter group
Meaning
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Inputs, outputs
Assign a start address to the module. (Outputs only if the option "Address setting for LOCK/UNLOCK with FETCH/WRITE" is selected)
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"Address setting for LOCK/UNLOCK with FETCH/WRITE" option
Select this option if you want to use the access coordination function with the FCs LOCK/UNLOCK in FETCH/WRITE mode.
This function uses process output via the backplane/P bus. As a result, the output addresses can be set as soon as this option is selected.