Control of Selective-Collective Elevators Based on the Use of Integrated Circuits

Selective-collective elevators present, as far as the logic design is concerned, the most complex control problems among simplex elevators. A control unit for this type of elevator, completely based on the use of digital integrated circuits, is described in the paper. The application of integrated circuits improves, in the authors' opinion, reliability and maintainability of elevator control as compared with the classical control units equipped with electromechanical relays and even more recent static solutions with discrete transistor logic circuits. This approach gives not only technical advantages, but is also justified from the economic point of view. The developed elevator control has been constructed and tested successfully on a six-floor office building. Owing to the conception of the functional subunits, it is possible to build up controls for any number of floors using only five standard printed circuit boards. The design of the control unit is based on the combinational and asynchronous sequential logic circuits. The Boolean equations, according to which the subunits were implemented, are given in the paper.