Contents I. Introduction
IN modern time due to rapid population growth in the urban areas, in multi-stored buildings need for elevators is being increased. With rising life standards and attention towards safety measures and with the development in modern technologic, elevator systems are getting better, fast and more reliable. In the past, most of the elevator systems were focused on the mounting of elevators, around 1980s the need for elevator maintenance and fault staff had started to increase [1]. For example, splash doors have been replaced by automatic doors system, cards with relay have been replaced by microprocessor electronic cards, in multi storage building single-speed elevators have been replaced by double-speed or speed-controlled elevators. Such developments improve the quality of elevator systems, therefore increase the reliability of elevator system compared to previous years [2]. Elevator control system [3]–[4], and its logic analysis [5]–[6] have been creating interest to engineers and its context scheduling [7] is still in research.
