Safety circuit - there are safety induction switches on this circuit to check whether each safety component acts, overheat protection switch of main engine, upper and lower limit switch of terminal station, emergency stop switch of pit car roof machine room.
Door lock return - door lock contact switch for each hall door. It is used to detect whether each hall door is closed
Leveling inductor (layer selector) - generally photoelectric switch or electromagnetic induction switch plus magnetic separator. Now there is APD for reading magnetic stripe, which is used to judge the leveling position of the floor
Rotary encoder on the host - at present, most of them are integrated on the host, generally incremental rotary encoder, which is used to calculate the motor speed and calculate the inverter output with PID algorithm.
----The above only mentioned some common users are not easy to know,
Combined with the reminders in the comments, there are light screens or safety touch panels installed on the car door, and load cells generally installed on the car bottom.