can thus be localized and replaced indirectly coupling the bus participant module to the buses 30 and 32 that go beyond the modules enables individual modules to be separated at any time from the buses 30 and 32 without having to switch off the system the additional functions of the modules that are separated from the bus remain in operation the operating time of the system is thus increased fig3 shows an advantageous handling means 22 comprising a u shaped holding device 38 having lateral lo shoulders 40 the edges 42 and 44 of the shoulder 40 correspond to the resilient contact pins 16 or 18 and are designed so that the separating motion of the handling means 22 shown by a double arrow a changes into a lifting motion of the resilient contact pins 1 and 18 shown by double arrow b in this course of motion the contact projection 26 of the resilient contact pins 16 or 18 also moves along the corresponding contact pins 12 or 14 and thus scrapes off the oxide layer holding device 38 enables handling means 22 to better stay in the separating position fig4 shows an encapsulated embodiment the present invention where the holding.