Arrangement for the identification of the logical composition of a modular system

摘要

The invention relates to a method and an arrangement for the identification of the logical composition of a modular system comprising an electrical base unit (1) with a plurality of slots each for receiving a pluggable electrical unit (2), each pluggable electrical unit (2) being electrically connected to the base unit (1) by means of a multi-pin plug-in connection comprising a plug-in contact device (23) and a mating plug-in contact device (13) and the base unit (1) being provided with signal processing means (12). Each pluggable electrical unit (2) is provided with an addressable serial read-only memory (21) for receiving identifiers clearly identifying this unit. The read-only memory (21) is connected via a serial bus (3) to the signal processing means (12) of the base unit (1). The serial bus (3) is physically formed by two bus lines (31,32) with a synchronized alternation of successive signal levels. The read-only memories (21) of all the pluggable electrical units (2) are addressed identically and in a way permanently set on the pluggable electrical unit (2). Of the two bus lines (31,32) of the serial bus (3), one bus line (31) is commonly connected to all the read-only memories (21) and the signal processing means (12) and the second bus line (32) in each case is separately connected to a read-only memory (21) and the signal processing means (12).