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Black Boxes: Nesting Basics

Note:

Since a device tag (DT) only consists of two levels, only two levels of nesting can be analyzed to where they can be fully used by all of the program functions.

The front DT always stands alone when nested, all others are stored in the second part of the DT, where the remaining DTs are keyed from right to left so that the numeric portion and the identifier of the last DT remain identifiable.

Only that which lies inside the box and which has been explicitly entered into the DT is nested.

The decision, as to whether a component is within the box or not, is based on the insertion point. Several boxes can be nested within each other, and the insertion point is also the deciding factor here.

All components / functions can be nested by acquisition of the device tag, and nearly all of the components / functions can be nested using boxes. The exceptions are:

Settings

Disabling nesting (using the menu items Project > Properties > Structure > [Other], tab Inheritance) only affects components whose own DT information is located within a box. A lamp without a DT therefore always remains allocated to the box as long as it remains within the box. The setting can't therefore affect the components outside of the box.

After nesting, EPLAN recalculates all of the DTs of the functions located within the boxes.

Warning:

To change these settings you must edit the project alone, as this setting can't be changed in multi-user operation.

See also