Storage system having at least one shelf unit , wherein the shelf unit has plural shelves arranged on top of each other, wherein each shelf is logically subdivided in plural compartments (TB) arranged side by side, wherein the compartments each form a partial section (TB) within a surveillance space (R); wherein a unique address is assigned to each of the compartments (TB), and having a sensor system for detecting an occupancy of the compartments (TB), wherein the sensor system is configured for spatially scanning the occupancy of one of the compartments (TB) so as to generate an occupancy information , which indicates a degree of occupancy of the respective compartment (TB), and having a data bus , which is connected to the sensor system and a communication device , wherein the storage system is configured to perform the following steps: - detecting in each case an occupancy information of the compartments (TB) by the sensor system , - transmitting the occupancy information together with the address assigned to the compartment (TB), from which the occupancy information has been detected, from the sensor system via the data bus to the communication device , - establishing a network connection by the communication device so as to transmit occupancy information to a server or control information to the storage system in a unidirectional or bidirectional communication; wherein the sensor system has plural sensor assemblies , characterized in that the surveillance space (R) is bordered or encompassed by delimitation elements , that comprise devices for receiving further delimitation elements or of separation elements for establishing the partial sections (TB), wherein the further delimitation elements or separation elements are configured for being inserted, from above, into the devices , so that approximately right-angled corners as well as the respective partial section (TB) are formed; and that the devices comprise lateral contact surfaces , which are configured for electrically connecting the delimitation elements inserted therein, and the sensor assemblies included therein, with the sensor system . - detecting in each case an occupancy information of the compartments (TB) by the sensor system , - transmitting the occupancy information together with the address assigned to the compartment (TB), from which the occupancy information has been detected, from the sensor system via the data bus to the communication device , - establishing a network connection by the communication device so as to transmit occupancy information to a server or control information to the storage system in a unidirectional or bidirectional communication; wherein the sensor system has plural sensor assemblies , characterized in that the surveillance space (R) is bordered or encompassed by delimitation elements , that comprise devices for receiving further delimitation elements or of separation elements for establishing the partial sections (TB), wherein the further delimitation elements or separation elements are configured for being inserted, from above, into the devices , so that approximately right-angled corners as well as the respective partial section (TB) are formed; and that the devices comprise lateral contact surfaces , which are configured for electrically connecting the delimitation elements inserted therein, and the sensor assemblies included therein, with the sensor system . <EOS>