> For the complete documentation index, see [llms.txt](https://docs.dietrichs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dietrichs.com/dietrichs-intelligent-documentation/docs-de-en/holzrahmenbau-kompendium/prinzipien-des-hrb-systems/variablen/obere-und-untere-anschlusse.md).

# Upper and lower connections

For the walls, HRB types can be selected for the upper and lower connections. In the assignment, the HRB interpreter then executes that type. For calculations in intermediate values and conditions, it is useful to know which HRB type was selected for the connections. Since version 19.01, the HRB types are now passed to the HRB interpreter via corresponding variables; they can therefore be used in the editor:

EOAh Upper connection horizontal

EOAs Upper connection angled

EUA Lower connection

The following is transmitted *empty* (no value) for "automatic" or the HRB type number is transmitted.