Elevator System High-Level Design and Communication Flow

This memory captures Page 2 of 10 of a detailed system design for an Elevator System, focusing on its High-Level Design (HLD) and Communication Flow.

High-Level Design (HLD)

The elevator system is described as a network of interconnected components designed to efficiently handle user requests and movement. The core components identified are:

• Users: Representing people within the building, interacting via hall buttons on each floor and cabin buttons inside the elevator.
• External Systems: Including integrations with Fire Alarm System, Power Management System, and Building Management System.
• Floor Panels: Located on each floor, equipped with hall buttons to initiate requests.
• Cabin Panels: Situated inside the elevator car, containing buttons for users to select their desired destination.
• Elevator Controller (Scheduler): The central processing unit, often referred to as the brain of the system, responsible for receiving requests and making intelligent decisions.
• Display System: Provides real-time information to users, showing the current floor and the elevator's direction.
• Elevator Cars: The physical units that move between floors, responsible for opening and closing doors to serve passengers.

Communication Flow

A step-by-step breakdown illustrates how a request is processed:

1. A user presses a hall button, initiating a request that is sent to the Floor Panel.
2. The Floor Panel forwards the request to the Elevator Controller (Scheduler).
3. The Scheduler assigns the most suitable Elevator Car based on a predefined algorithm.
4. The assigned Elevator acknowledges the request and begins moving.
5. Upon reaching the destination floor, the Cabin reaches the floor and opens its doors.
6. Status updates (current floor and direction) are sent to the Display System.
7. The system continuously processes subsequent requests.

Key Components (At a Glance)

A concise summary of each component's primary function:

• Elevator Controller (Scheduler): Brain of the system; receives requests.
• Elevator Car: Moves between floors; opens/closes doors.
• Floor Panel: Hall buttons on each floor; sends requests.
• Cabin Panel: Buttons inside the elevator; used to select a destination.
• Display System: Displays current floor, direction, and status.