A PLC is to be used to control the operation of a safe vault. When a person enters a password of the vault, the vault door is to be opened automatically. An infrared beam in the door is used to detect the actual entrance of any objects. Ten seconds after any objects enter, the door is closed unless there are any objects between the doorway. If there are no entrance of any objects for 30s after the door has opened, it is closed again.

Construct a ladder logic diagram for this task. Please create the related I/O assignment table first.