Abstract: An enclosed input/output module comprising an enclosure (1), at least one printed circuit board (2) arranged along one of the interior surfaces of the enclosure, a cover (3) having an essentially U-shaped receiving channel (4) including a pair of hollow legs, and a process connector (5) that fits within the receiving channel of the cover, wherein the module comprises a second printed circuit board such that the two printed circuit boards fit into the legs of the cover to frame the receiving channel on both sides and both printed circuit boards are free of mounted components, apart from light-emitting diodes, in the portions that frame the receiving channel. The module may additionally include light-emitting diodes (6) on the circuit boards (2), optical waveguides (7), latching elements and recesses (25, 26) for retaining the process connector (5) with respect to the cover (3) in a preliminary position, and/or threaded means (17, 18) for fully joining the process connector (5) to the cover (3).

Abstract: A plug and socket connection system for an electronic unit, consists of a connection plug for the connection of connecting lines and a socket for receiving the connection plug. In accordance with the present invention, both the socket and the connection plug have at least one linearly guiding guide element for the guiding of the connection plug in correct position upon introduction of the connection plug into the socket and at least one locking element for the detachable locking of the connection plug in the plug socket, the locking elements cooperating by engagement in at least two positions.