The highly integrated 32-digit double-CPU, inter-monitor of master / slave CPU enhance the data processing speed to the greater extent with the more perfect functions and the higher reliability. The high precsion car shift detection technology can fulfill almost zero-to-zero leveling accuracy. The passengers find their elevator legs in entering into and exiting from the cars. It has the embedded specialist self-diagnosis system to the trouble cause, storage and display functions of the defect reason, it is easy and simple in expanding the functions too.