Patent ID: 6855001

Claim:
A modular system comprising an electrical base unit with a plurality of slots each for receiving a pluggable electrical unit, each pluggable electrical unit being electrically connected to the base unit by means of a multi-pin plug-in connection comprising a plug-in contact device and a mating plug-in contact device and the base unit being provided with signal processing means, wherein for each multi-pin plug-in connection: plug-in contacts of the multi-pin plug-in connection ( 13 , 23 ) are divided into at least two groups ( 31 , 32 ), a first group ( 31 ) of plug-in contacts provides for the connection of a permanently configured line ( 41 ) for the identification of the pluggable electrical unit ( 2 ) and a second group ( 32 ) of plug-in contacts provides for the connection of a freely configurable line ( 42 ) for the communication of the pluggable electrical unit ( 2 ) with the base unit ( 1 ), the direction of signal transmission and the logical signal assignment of the freely configurable line being determined in accordance with the identity of the pluggable electrical unit ( 2 ) by the signal processing means ( 12 ).