An electronic module for an I/O modular system comprises a housing, a plug-in connection for the coupling to a connection of the I/O modular system, and at least one locking lever which has an actuating end arranged on the side turned away from the plug-in connection, and a locking portion. The locking lever has at least one light-conducting portion. A light source is associated with the locking lever. A light exit face is provided in the region of the actuating end of the locking lever.