Application of PLC Control Cabinets in Hotel Intelligent Systems

Core Application Scenarios

A. Energy Management System

• Power Monitoring
  • Real-time floor-by-floor power load tracking (±0.5% accuracy).
  • Automatic backup power switching with <10s transfer time.
  • Typical configuration: Schneider Modicon M580 PLC + smart meters (via Modbus RTU protocol).
• Lighting Control
  • Automatic luminance adjustment in lobbies and corridors (0–100% stepless dimming).
  • Card-activated power control in guest rooms (ensuring energy efficiency when unoccupied).
  • Protocols: DALI/KNX integration with PLC via gateway.

B. HVAC Control

• Chiller Plant Optimization
  • Automatic adjustment of chiller units based on real-time occupancy rates.
  • Precise control of chilled water supply/return temperature differential (ΔT = 5±0.3℃).
• Guest Room VAV Control
  • High-accuracy temperature/humidity sensors (±0.5℃/±3%RH).
  • Coordinated operation of 3-speed fan coils and motorized valves for personalized comfort.

C. Water Supply & Drainage

• Constant Pressure Water Supply
  • Pressure maintained within 0.3–0.5MPa via PID-adjusted VFD (variable frequency drive).
  • Automatic activation of standby pumps during primary pump failures.
• Pool Water Treatment
  • Online residual chlorine monitoring (0.3–1.0ppm).
  • Automatic chemical dosing to maintain water quality standards.

Special Function Implementation

A. Elevator Integration

• Emergency recall during fire alarms (compliant with GB50016-2014 standards).
• Intelligent dispatching during peak hours (e.g., check-in/check-out times) to reduce wait times.

B. Security Integration

• Monitoring of access control status (over 500 door contact signals).
• CCTV system 联动: Alarm triggers automatic video pop-ups for security personnel.

Implementation Benefits

• Energy Savings: 25–30% reduction in central HVAC energy consumption.
• Maintenance Efficiency: 60% faster fault response time via PLC-driven diagnostics.
• Guest Experience: Room temperature control precision enhanced to ±0.5℃, elevating comfort levels.