The invention relates to an arrangement (HAS) with a first subrack (1) configured with several slots (11,...,18) for receiving individual modules (BG11,...,BG18), which are assembled modularly to form a first
automation system (AS1), and a second subrack (2) with several further slots (21,...,28) for receiving further individual modules (BG21,...,BG28), which are assembled modularly to form a second
automation system (AS2), wherein - a slot (18) of the first subrack (1) is configured as a first power supply module receptacle (SVG1) with first contact means (K1), and - a slot (21) of the second subrack (2) is configured as a second power supply module receptacle (SVG2) with second contact means (K2), wherein - the first and the second power supply module receptacles (SVG1, SVG2) are configured as follows:that they structurally and electrically complement each other between the first subrack (1) and the second subrack (2) to form a basic supply module (VG), wherein - the first contact means (K1) are designed to supply the first and the second subrack (1,2) with a supply
voltage and - the second contact means (K2) are designed to supply the second and the first subrack (1,2) with a supply
voltage, and - that the basic supply module (VG) formed from the supply module receptacles (SVG1, SVG2) is designed to accommodate a first supply
voltage module (PS1), a second supply voltage module (PS2) and a third supply voltage module (PS3).