Honeywell SBC PCD2.M5540 Technical Specifications General Manufacturer: Honeywell Building Technologies Model Type: Modular System Bus Controller (SBC) Series: PCD (Programmable Control Device) Series Primary Use: Advanced HVAC and building automation control Hardware Processor: 32-bit RISC CPU Memory: Flash Memory: 4MB (program storage) RAM: 512KB (runtime data) Communication Ports: System Bus: 1× RS-485 (PCD bus for module expansion) Field Bus: 1× RS-485 (BACnet MS/TP or Modbus RTU) Service Port: 1× RS-232 (local configuration) Expansion Capability: Supports up to 32 I/O modules I/O Capabilities (with expansion modules) Digital Inputs: Up to 256 points Analog Inputs: Up to 128 points (0-10V, 4-20mA, etc.) Digital Outputs: Up to 128 points (relay or triac) Analog Outputs: Up to 64 points (0-10V, 4-20mA) Software & Protocols Programming: Honeywell CARE software Supported Protocols: BACnet MS/TP (B-ASC) Modbus RTU Honeywell PCD bus (for module communication) Control Strategies: PID loops, scheduling, alarms Performance Program Capacity: Up to 500 control loops Scan Rate: <100ms for critical I/O Power & Environment Power Supply: 24V AC/DC (±15%) Power Consumption: 8W typical Operating Temperature: 0°C to 60°C (32°F to 140°F) Humidity: 10-90% non-condensing Physical Characteristics Dimensions: 90mm × 110mm × 65mm (W×H×D) Mounting: DIN-rail (TS-35) Certifications Safety: UL 916, EN 60730 EMC: EN 61000-6-2, EN 61000-6-3 BACnet: BTL Listed (BACnet Advanced Application Controller) Key Features Modular design for flexible I/O configuration Native BACnet MS/TP support for BMS integration Built-in PID control for HVAC applications Field-upgradable firmware LED status indicators for diagnostics