It should be noted that all the fields for entering object addresses in OpenSCADA have a mechanism for selecting the address. This mechanism involves element-by-element selection, during which movement in depth occurs. For example, at the beginning of the address "ModBus.CM101.AT101_1" set we will have an option of choosing the data source type, among which will be "ModBus"; after choosing which controller objects of the ModBus module will be added to the list of available selection elements where "ModBus.CM101" will be; selecting the element "ModBus.CM101" will add controller parameters and so on to the final element according to the object hierarchy. For possibility of returning to the level above, the elements of all the higher levels from the current address value are inserted into the list of choice.