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Unity Pro: RW attribute on a variable

If a variable is RW (box is checked) and not a Constant, it can be written to (assigned a new value) by the application.
It may also be changed by communication from an outside device, e.g. another PLC, or Unity Pro. This the default state of the attribute.

If it is Read Only by program, (RW box is unchecked ) it cannot be changed by the application but it still may be changed by an outside device.

If it is unlocated, another PLC could not change it but Unity Pro still could. 

If the RW box is unchecked (Read only) AND the Constant box is checked, it cannot be changed at all. 
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