Input Modules exist in both DIN rail format to be mounted in the enclosure, as well as in a smaller format to be included in the in-wall mounting box of a switch. Via input modules, external contacts such as standard switches, window and door contacts, all kinds of detectors, garage doors and the like are connected to the Qbus system

Via the relay modules, outputs can be switched. A relay module has no specific function but can handle any switch functions: monostable (eg a doorbell), bistable (on / off), timer, interval, thermostat output. Some relays can also control motors of blinds, curtains, gates.

In a Qbus system, motor control (for shutters, screens,…) can be done centrally (from the electrical distribution board) or decentrally (with a module on the bus closeby the motor).