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

RS-485Modbus RTU2-O

Product overview
The FBB-4DI2DO-R.24.AMP is a decentralized I/O module with four binary inputs and two relay outputs. It is designed for local switching tasks and is suitable for controlling up to two motorized fire dampers (BSK) with feedback (end switches OPEN/CLOSED) or for general decentralized data points (remote I/Os).

Functions and measurements

• Runtime measurement on each operation of the BSK (records total opening/closing time and dead time until position change is reported).
• Measured times are compared with configurable maximum values set during commissioning.

Options

• Power supply (24 V or 230 V): In the "R.230" variant the supply voltage is also used as the output signal for the relay outputs (L is switched through the relay contact to the digital output).
• Option "AMP": Module variants equipped with AMP pluggable connectors for connection of fire damper cables pre-assembled by manufacturers.

Technical specifications

• Function: Decentralized I/O module with 4 digital inputs and 2 relay outputs
• Applications: Control of up to two motorized fire dampers (BSK) with feedback (end switches OPEN/CLOSED); general decentralized data points / remote I/Os
• Measurement: Runtime measurement per BSK operation (opening/closing time, dead time) with comparison to configurable max values
• Variants: FBB-4DI2DO.R.xxx and FBB-2DI1DO.R.xxx (different configurations)
• Power supply: selectable 24 V or 230 V ("R.230" uses supply voltage as relay output signal)
• Relay outputs: Normally closed contacts; rated for 230 V/16 A per product title
• Option "AMP": AMP pluggable connector variants for pre-assembled BSK cables
• Manufacturer: romutec Steuer- und Regelsysteme GmbH
• Product number / SKU: 00003218
• Weight: 0.451 kg
• Release date (meta): 2026-04-28