The proposal is for an arrangement with a plurality of plug points (SP1, ...) which are interconnected via a system bus (SYB) having data and control lines, address lines (AL1, ...) taken to connections of the plug points (SP1, ...), one of which is connected to a selector terminal (AN1, ...), and plug-in functional units (FE1, ...), at least one (FE1; FE3) of which has means for connecting the address lines (AL1, ...) to this unit and each of the remaining functional units (FE2; FE4) has means for connecting the unit to the selector terminal (AN1, ...) of the plug point. Units performing read and write functions can be fitted at any plug point in such an arrangement. The invention is applicable in store-programmable controls.