I. Core Architecture of PLC-Enabled Intelligent Lighting

• Multi-Source Data Fusion & Processing: PLCs integrate signals from light sensors, infrared detectors, and time controllers to build complex control logics. For example, they automatically shut off artificial lighting when natural light is sufficient, or trigger delayed shutdowns in unoccupied areas.
• Modular Hierarchical Control: Supporting area division and device grouping, PLCs enable distributed management of LED fixtures, dimming modules, and power supplies via protocols like RS-485 and Modbus. This allows large commercial complexes to implement refined control by floor or business type.
• Fault Diagnosis & Early Warning: PLCs monitor real-time electrical parameters (current, voltage) in lighting circuits. Using built-in algorithms to detect anomalies, they promptly transmit fault alerts, lowering maintenance costs.

II. Scenario-Based Applications of Intelligent Lighting

• Smart Offices: In open workspaces, PLCs pair with occupancy and ambient light sensors to adjust workstation lighting adaptively. In conference rooms, they auto-switch between "projection mode" and "meeting mode" based on reservation systems.
• Commercial Complexes: Mall atriums use dynamic dimming—PLCs generate lighting displays with varying color temperatures and brightness, tailored to time of day, holidays, or promotions. Underground parking lots employ microwave sensors to "turn lights on/off with vehicle presence," cutting energy use by over 60%.
• Hotel Guest Rooms: PLC-connected room panels enable one-click switching between "welcome," "sleep," and "reading" modes. Corridors combine infrared sensing and time control, maintaining 30% basic lighting when unoccupied.
• Cultural Venues: Museums and galleries use PLCs to create low-illuminance, UV-free lighting environments. Paired with display case motion detectors, they ensure precise exhibit protection.

III. Energy Efficiency: Empirical Insights

• A Grade A office building saw 42% annual lighting energy savings post-upgrade, reducing electricity bills by over ¥800,000.
• A large mall reduced lighting’s share of total energy consumption from 38% to 23%.