Arrangement with modular parts and an adjustable coding

An arrangement comprising:

• at least one modular part of a first type,
• at least one modular part of a second type,
• an adjustable coding, which has coding settings, which allow or prevent a joining together of the modular parts of the first and second type, and
• a holding appliance for holding one modular part on the other modular part when these are joined together,
• wherein the coding comprises coding elements arranged on the modular parts of the first and second type, each coding element being movably arranged in a receiving space formed in the modular part of the first or second type and comprising a projection projecting out of the receiving space, wherein the respective coding element is disposed so as to be as a whole linearly movable to and fro in a direction of movement in order to assume at least two coding positions, which are selectable so that
• a) for joining together of the modular parts of the first and second type, a respective projection of a coding element is disposed, offset, in the direction of movement with respect to the projection of an opposing coding element, and
• b) for prevention of a joining together of the modular parts of the first and second type, at least one projection of a coding element abuts the projection of an opposing coding element.