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