Modular bus system

1. A modular bus system, comprising:

a support rail having a base and a longitudinal axis;

at least one base module mountable on the support rail for electrical connection to at least one input/output functional module, the at least one base module having a backplane printed circuit board with at least one group of at least two first electrical connectors connected thereto for electrical connection to an electrical connector of an input/output functional module, wherein the at least two first electrical connectors of the at least one group are arranged one after the other along an imaginary line which extends perpendicular to the longitudinal direction of the support rail and lie in a plane in which the base of the support rail is located or which is parallel to the base;

at least one input/output functional module comprising an electrical connector and an electronic device for communication with the modular bus system, wherein the electrical connector of the input/output functional module is configured for being electrically connected to one of the electrical connectors of the at least one base module;

an electronic device arranged on the backplane printed circuit board of the at least one base module, which is configured for communication with the electronic device of the at least one input/output functional module;

wherein the electronic device of the at least one base module is electrically connected to the at least two first electrical connectors and to a second electrical connector for being electrically connected to a complementary second electrical connector of a further base module and is adapted to detect whether an input/output functional module is connected to any one of the at least two first electrical connectors, and if so, to which one of the first electrical connectors an input/output functional module is connected.

2. The modular bus system as claimed in claim 1 , wherein on at least one side of the backplane printed circuit board of the at least one base module, which is perpendicular to the longitudinal axis of the support rail, the second electrical connector is arranged for being electrically connected to the complementary second electrical connector of the further base module, the complementary second electrical connector being arranged on a side of a backplane printed circuit board of the further base module, which is perpendicular to the longitudinal axis of the support rail.

3. The modular bus system as claimed in claim 1 , wherein the electronic device of the at least one base module is configured to selectively connect the first electrical connectors and the at least one second electrical connector so that input/output functional modules connected to the at least one base module are able to communicate with each other and/or with the electronic device and/or with input/output functional modules that are connected to another base module.

4. The modular bus system as claimed in claim 1 , wherein the at least one base module comprises a receptacle body including at least one group of at least two receptacle areas, wherein each receptacle area extends perpendicular to the base of the support rail and is configured to accommodate at least part of an input/output functional module, wherein the at least two receptacle areas of the at least one group are arranged one after the other along an imaginary line which is perpendicular to the longitudinal direction of the support rail and lie in a plane in which the base of the support rail is located or which is parallel to the base, wherein each receptacle area is associated with one of the first electrical connectors.

5. The modular bus system as claimed in claim 4 , wherein the at least one base module includes a support plate which is mountable to the support rail and is configured to support the backplane printed circuit board and the receptacle body.

6. The modular bus system as claimed in claim 1 , further comprising a header module that is electrically connectable to a header base module, wherein the header base module includes an electrical connector for being electrically connected to the at least one base module.

7. The modular bus system as claimed in claim 6 , wherein the header module is configured for communication with the input/output functional modules connected to the at least one base module.

8. The modular bus system as claimed in claim 6 , further comprising a bus coupler which is connected to the header module via the header base module.

9. The modular bus system as claimed in claim 8 , wherein the header module and the bus coupler in fixed combination define a base block module which includes a bridging base module that comprises a backplane printed circuit board with an electrical connector and/or with a plurality of electrical connectors for connecting input/output functional modules, and/or three further electrical connectors for connecting the header module and/or network ports and/or a computer port and/or another port.

10. The modular bus system as claimed in claim 1 , wherein a plurality of base modules are arranged side by side on the support rail along the longitudinal axis of the support rail.