A method for commissioning and/or maintaining a fire alarm and/or extinguishing control center by means of a display and operating unit (38, 40-44, 46), wherein the fire alarm and/or extinguishing control center has a central control unit and a plurality of functional modules (14a-14g) connected to the central control unit, wherein the display and operating unit (38, 40-44, 46) is connected or can be connected to the central control unit, wherein each of the functional modules (14a-14g) has a plurality of connections for connecting participants, in particular fire alarms, signal generators and/or actuators, and includes an interaction unit with an optical display unit (16a-16g) for signaling an operator, wherein the method is adapted in such a manner that the display and operating unit (38, 40-44, 46) displays functional module data belonging to one of the functional modules (14a-14g) and the display of the functional module data depends on the signaling of the optical display unit (16a-16g) of the functional module (14a-14g) wherein the method comprises - identifying one of the functional modules (14a-14g) on the basis of an input to the display and operating unit (38, 40-44, 46), - providing functional module data belonging to the identified functional module (14a-14g), - displaying the functional module data on the display and operating unit (38, 40-44, 46), and - controlling the optical display unit (16a-16g) of the identified functional module (14a-14g). wherein the fire alarm and/or extinguishing control center has a central control unit and a plurality of functional modules (14a-14g) connected to the central control unit, wherein the display and operating unit (38, 40-44, 46) is connected or can be connected to the central control unit, wherein each of the functional modules (14a-14g) has a plurality of connections for connecting participants, in particular fire alarms, signal generators and/or actuators, and includes an interaction unit with an optical display unit (16a-16g) for signaling an operator, wherein the method is adapted in such a manner that the display and operating unit (38, 40-44, 46) displays functional module data belonging to one of the functional modules (14a-14g) and the display of the functional module data depends on the signaling of the optical display unit (16a-16g) of the functional module (14a-14g) wherein the method comprises - identifying one of the functional modules (14a-14g) on the basis of an input to the display and operating unit (38, 40-44, 46), - providing functional module data belonging to the identified functional module (14a-14g), - displaying the functional module data on the display and operating unit (38, 40-44, 46), and - controlling the optical display unit (16a-16g) of the identified functional module (14a-14g). - identifying one of the functional modules (14a-14g) on the basis of an input to the display and operating unit (38, 40-44, 46), - providing functional module data belonging to the identified functional module (14a-14g), - displaying the functional module data on the display and operating unit (38, 40-44, 46), and - controlling the optical display unit (16a-16g) of the identified functional module (14a-14g).