Electropneumatic field device , such as an electropneumatic comprising: - at least one electrical field input ; - a pneumatic supply input ; - at least one electronic and/or pneumatic component , which is connected to the at least one electrical field input and, if appropriate, to the pneumatic supply input ; and - at least one field output (A 1 , A 2 , A 3 , A 4 ), at which a field output signal (S 1 , S 2 , S 3 , S 4 ) can be output on the basis of a field signal received via the at least one electrical field input ; and - a group made up of at least two modular electronic and/or pneumatic components of different functionality and at least one modular slot (23a-d) for occupation with one electronic and/or pneumatic component from the group in each case, wherein the at least two electronic and/or pneumatic components of the group and the at least one slot are modularly adapted to one another in such a manner that their electrical and if appropriate pneumatic interfaces (33a-d, 35a-d, 25a-d, 37a-d) merge into one another when the slot is occupied; wherein the at least one slot has an electrical interface (35a-d) connected to the field input and a pneumatic interface (25a-d) connected to the pneumatic supply input for pneumatically coupling a pneumatic connection of the electronic and/or pneumatic component , characterized in that the at least one slot has a closure, which, in the unoccupied state of the at least one slot and in case of occupation with an electronic and/or pneumatic component without pneumatic function, closes the pneumatic interface (25a-d) thereof in an essentially airtight manner and is deactivated in the occupied state of the at least one slot (23a-d) with an electronic and/or pneumatic component with pneumatic function, so that the pneumatic connection is pneumatically connected to the pneumatic supply input. - at least one electrical field input ; - a pneumatic supply input ; - at least one electronic and/or pneumatic component , which is connected to the at least one electrical field input and, if appropriate, to the pneumatic supply input ; and - at least one field output (A 1 , A 2 , A 3 , A 4 ), at which a field output signal (S 1 , S 2 , S 3 , S 4 ) can be output on the basis of a field signal received via the at least one electrical field input ; and - a group made up of at least two modular electronic and/or pneumatic components of different functionality and at least one modular slot (23a-d) for occupation with one electronic and/or pneumatic component from the group in each case, wherein the at least two electronic and/or pneumatic components of the group and the at least one slot are modularly adapted to one another in such a manner that their electrical and if appropriate pneumatic interfaces (33a-d, 35a-d, 25a-d, 37a-d) merge into one another when the slot is occupied; wherein the at least one slot has an electrical interface (35a-d) connected to the field input and a pneumatic interface (25a-d) connected to the pneumatic supply input for pneumatically coupling a pneumatic connection of the electronic and/or pneumatic component , characterized in that the at least one slot has a closure, which, in the unoccupied state of the at least one slot and in case of occupation with an electronic and/or pneumatic component without pneumatic function, closes the pneumatic interface (25a-d) thereof in an essentially airtight manner and is deactivated in the occupied state of the at least one slot (23a-d) with an electronic and/or pneumatic component with pneumatic function, so that the pneumatic connection is pneumatically connected to the pneumatic supply input. <EOS>