The SEM-01 input separator is used to separate control signals into given system groups, while blocking access of these signals to other systems. The separator is used in the construction of control systems using eXta building equipment. With the help of this system we can make the influence of control signals brought to the trigger inputs of the system dependent on the user's needs. The separator passes the signal in one direction, but blocks the signal from moving in the opposite direction. One independent housing houses 4 independent separating elements that can be used in the created control system.