Connects to CU5000, CU50EN or CU50ENSVN door controllers, to provide the option to manage multi relay switchable output systems such as elevator floor level access, multi shutter and barrier systems, machine switching etc. A maximum of 16 relay boards, each containing 8 relays can be connected in series to one Salto Control Unit. Each relay has user access (triggering) rights set in the Salto software.