Digital I/O module FBB-2DI1DO-R.24.AMP

RS-485BACnetwith relay output

Product information
The FBB-2DI1DO-R.24.AMP is a compact I/O module providing 2 digital inputs and 1 relay output for decentralized switching tasks. It is designed for controlling motorized fire dampers and for reporting damper position feedback (limit switches OPEN/CLOSED), as well as for general remote I/O applications and data collection.

Run-time measurement and diagnostics
The module supports runtime measurement for motorized fire dampers. At each operation the opening and closing durations and the dead time (time until departure from the initial position is reported) are measured. Measured times are compared against configurable maximum values set during commissioning to support diagnostics and maintenance planning.

Options and variants

• Supply voltage: available in 24 V (AC/DC) or 230 V versions. In R.230 variants the supply voltage is used as the output feed for the relay contacts (L is switched to the digital output via the relay contact).
• Option "AMP": module variants with AMP-style pre-fabricated pluggable connectors for quick connection to fire dampers using manufacturer-supplied prewired cables.

Technical specifications

• Model: FBB-2DI1DO-R.24.AMP
• Function: 2 digital inputs (DI), 1 relay output (DO)
• Relay output (R.230 variants): 230 V, 16 A
• Suitable for: decentralized switching tasks, control of motorized fire dampers and damper position feedback, general remote I/Os
• Runtime measurement: opening/closing time and dead time measurement with comparison to commissioning-set maximum values
• Variants: FBB-4DI2DO.R.xxx and FBB-2DI1DO.R.xxx available in multiple configurations
• Supply options: 24 V AC/DC (±10%) or 230 V AC (±10%) depending on model
• Bus interface: RS485, galvanically isolated; Protocol: BACnet MS/TP
• Supported baud rates: 9,600; 19,200; 38,400; 57,600; 76,800; 115,200 (autobauding supported)
• Memory: uPC internal; EEPROM for configuration with up to 100,000 write cycles
• Environmental: Operating temperature 0...50°C; Storage/transport -10...70°C; Relative humidity 10...90% non-condensing
• Protection class: IP54 for .AMP variants; IP66/IP67 available depending on cable entry
• Enclosure dimensions: 160 x 140 x 81 mm
• Weight: 0.427 kg
• Product number / SKU: 00003222
• ReleaseDate (meta): 2026-04-28