An advanced industrial elevator control system developed in CODESYS for the Control Systems Technologies course made in University of Bologna. The project implements a modular architecture using the GA (Generic Actuator) approach, combining SFC (Sequential Function Chart) for logic flow and ST (Structured Text) for algorithmic calculations.
The system is built on a "Handshake Policy" and is divided into three main Functional Blocks (GAs):
The core of the system, managing elevator movement and positioning:
- Initialization: Automated sequence to calibrate the elevator position (Descent -> LimitDown -> Ascent -> Ready).
- Movement Logic: Handles transitions between floors using "Ramp" and "Deck" sensors to manage acceleration and deceleration.
- Fault Handling: Integrated safety checks for sensor mismatches (e.g., detecting a ramp sensor when a deck sensor was expected).
Controls the opening and closing cycles of the elevator doors:
- Safety First: Features a "Presence Sensor" logic. If an obstacle is detected during closing, the doors immediately reopen.
- Handshake Protocol: Communicates with the main policy to ensure doors are fully closed before the motor starts.
Manages the human-machine interface and the logic of floor requests:
- FIFO & Priority Logic: Uses an array-based system to store and prioritize calls from both internal panels and floor buttons.
- Visual Feedback: Controls LEDs for each floor to indicate active calls and current destination.
- Programming Environment: CODESYS V3.5
- Languages: SFC (Sequential Function Chart) and ST (Structured Text).
- Control Strategy: GA (Generic Actuator) approach with Do/Done handshake structure.
- Logic: FIFO (First In, First Out) call management with priority shifting.
This project was co-developed by:
- Andrea Gallo (@andreagallo-dev)
- Giorgio Ripani (@giorgioripani)
- Francesco Tassi (@francesco-tassi)
- Leonardo Lodolini (@sassuolo22)
Project Date: January 2026 Course: Control Systems Technologies