PLC ladder logic diagram for a two story building

This activity investigates the implementation of a control system for a 2-level passenger elevator using Relay Ladder Logic (RLL). Design criteria: The elevator can travel between 2 floors Call buttons are located on each floor The call button lights when activated and turns off when the carriage has reached its floor. The carriage has buttons for each floor which illuminate when pressed and turn off when the floor has been reached. A door open and a door close button are located in the carriage. The carriage cannot travel unless the door is closed and the brakes are unlocked. The door cannot open unless the carriage is at a floor stop and the brakes are locked. The elevator carriage waits at the last floor until it is called