A modular assembly of a module for a Logic Controller, including a container and a cartridge. The cartridge has a first electrical interface part and an electronic circuit arranged to provide a predetermined electronic function. The container has a housing, a backplane connector, a terminal connector and a receptacle extending inside the housing and adapted to receive the cartridge. The receptacle includes a second electrical interface part adapted to connect with the first electrical interface part. The cartridge and the receptacle are arranged to electrically connect the first and second electrical interface parts to establish an electrical interface when the cartridge is removably inserted in the receptacle of the container. The housing of the container defines the mechanical form factor of the module, while the cartridge determines the electronic functionality of the module. Accordingly, multiple containers having different form factors may accommodate the same cartridge.