Digital I/O module FBB-4DI2DO-R.24

RS-485Modbus RTU4-I

Product information
Module FBB-4DI2DO-R.24 provides four digital inputs and two relay outputs. It is intended for decentralized switching tasks and is suitable for controlling two motor-driven fire dampers with end-switch feedback (OPEN/CLOSED) or for general decentralized data points (remote I/Os).

Runtime measurement for fire dampers
For motor-driven fire damper applications, objects are available that record the measured run times of the dampers. Measurement is performed on each operation of the damper. The system determines the total time required to open and close the damper and the dead time (the time until the change of the damper's initial position is reported). Measured times are compared with maximum values configured during commissioning in the designated properties.

Available variants / options

• Power supply (24V or 230V): In the FBB-xxx-R.230 module the supply voltage is also used as the output signal for the relay outputs; L (230V) is switched to the digital output via the relay contact.
• Option "AMP": Variants with the "AMP" option are equipped with special connector sockets allowing connection of fire dampers with prewired cables supplied by various BSK manufacturers.

Note
FBB-4DI2DO.R.xxx and FBB-2DI1DO.R.xxx are available in different variants. You can choose among the options listed above.

Technical specifications

• Model: FBB-4DI2DO-R.24
• Product number / SKU: 00003183
• Manufacturer / Marque: romutec Steuer- und Regelsysteme GmbH
• Inputs: 4 digital inputs
• Outputs: 2 relay outputs
• Relay rating: 230V / 16A
• Supply voltage: variants 24V or 230V (for FBB-xxx-R.230 230V is used as output signal)
• Options: "AMP" (special connector sockets for prewired cables)
• Enclosure rating: IP67
• Weight: 0.488 kg
• ReleaseDate / Référence date: 2026-04-28