Overview
The Honeywell XL50-MMI is a programmable direct digital control (DDC) controller widely deployed in HVAC and building automation applications. Featuring an integrated operator interface (MMI), this controller combines robust control logic with local operator visibility. The XL50-MMI supports both standalone and networked operation, making it suitable for small to medium-sized commercial buildings including restaurants, shops, offices, and government facilities.
Key Features
- Integrated operator interface (MMI) for local monitoring and control
- Multiple communication options: LonWorks bus, C-bus, modem, or ISDN terminal adapter
- Flash-EPROM memory for efficient application downloads
- DIN rail or panel door mounting flexibility
- Removable screw terminal blocks for simplified wiring
- Capacitor-backed RAM—no battery required
- Stand-alone or networked operation with Excel 5000 system integration
Technical Specifications
- 4 analogue outputs
- 6 digital outputs
- 8 analog inputs for sensors
- 4 binary inputs for potential-free contacts
- Input supply voltage: 24 VAC
- RS232 serial port
- Communication protocols: LonWorks, C-bus
- Modem/ISDN support up to 38.4 Kbaud
- Weight: 1.80 lbs
- Mounting: DIN rail or panel door
Typical Applications
The Honeywell XL50-MMI excels in:
- HVAC control and management in commercial buildings
- District heating and hot water system regulation
- Air conditioning plants and chiller management
- Building automation networks with multiple zone controllers
- Standalone DDC control where networked integration is not required
Compatibility & Replacements
Compatible With
- Honeywell Excel 5000 system
- LonWorks (open LON) networks
- C-bus communication networks
- Serial modems and ISDN terminal adapters
- Third-party LonWorks-compliant devices
Replaces / Drop-In Replacement For
The XL50-MMI is a legacy model discontinued by the manufacturer. Verify compatibility with your system integrator before ordering as direct replacement compatibility depends on your specific network configuration and communication requirements.
Works With
- Honeywell Lizard application selector (PC-based configuration tool)
- CARE-generated application programs
- LonWorks NVBooster integration
- Standard serial terminals and modems (RS232)
- Excel 10 room/zone controllers in networked configurations
