EcoStruxure Operator Terminal Expert, cannot select a %M address for a BOOL variable.

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Issue:

In EcoStruxure Operator Terminal Expert, using the driver Schneider Electric - Modbus TCP Master, cannot select an address in the IEC61131 format.

Product Line:

EcoStruxure Operator Terminal Expert (all versions)

Resolution:
Once the driver selected, if it is selected in the System Architecture tab (central pane), its properties will be displayed in the right pane.
Under "Basic - Addressing Mode", there is the "IEC61131 Syntax" property that allows the selection between the two Modus addressing format or syntax.

IEC61131 syntax property

If not selected the driver will use the old syntax for addresses:
Old Modbus addresses syntax
If selected, the new IEC61131 syntax is used:
IEC61131 addresses syntax

Do note that this IEC61131 syntax parameter is selected by default from version 3.3 SP1 and unselected in the previous versions.