WZones

Hello to everybody :)
In order to be sure to pass to the PLC the correct "encumbrance signal", I would like to set one ReadOnly signal managed by the WorldZone, plus another one that I set inside my code after certain movements have been performed. This way, if I send to the PLC the OR function of the two I'm sure that the mechanism will never fail.

Does anybody know if this is possible?
If yes, how I have to declare the internal signal to assume just digital values and particularly is it possible to give to an internal signal the attribute ReadOnly which is mandatory for the WZones usage?

Thanks in advance!
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