Now that an initial understanding of all function blocks and reference points exists, it is possible to discern all relationships between these function blocks and reference points. This relationship is given in Figure 11.
A function block at the top of a column may exchange management information with a function block at the left of a row over the reference point that is mentioned at the intersection of the column and row. In case an intersection is empty, the associated function blocks can not directly exchange management information between each other.