Shelf for shelf support

The invention relates to a mounting frame (1) for installation in a shelf support (3), each with a central control unit (2), wherein the shelf (1) in the installed state with each other in series with a plurality of lines (L1-L6) are wired, with the wiring between the module frame (1) is designed such that the control unit (2) comprises a number of terminals (Rx.y) is fed with defined voltage levels, which is clearly correlated with the number of the other module frame comprises at least one of the serial connection directions. DOLLAR A Furthermore, the invention relates to a method for the relative positioning of an assembly frame in a sub-frame beams, each shelf detected (1) how many modules are on a connection side, notifies this information to all other-in-line assembly frame (1) and the positions of all the assembly frame (1) due to the now known hierarchy determined.