X20AIB744 B & R Automation
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The B & R Automation X20AIB744 is an input module from the X20 Fieldbus Input Output Modules series with four full-bridge inputs and a 24-bit ADC resolution. It features a data output rate of 5000 samples per second per channel and supports a bridge supply voltage of 5.5 VDC. The module has an insulation voltage of 500 Veff and additional dissipation of 1.43 watts.
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Product Description:
The X20AIB744 is an analog bridge input module produced by B & R Automation as part of the X20 Fieldbus Input Output Modules series. It provides four full-bridge input channels for strain gauges, load cells, or pressure transducers that must be digitized close to the point of measurement. Installed on an X20 backplane, the module conditions microvolt-level signals and forwards calibrated data to the controller, allowing precise force or weight monitoring inside conveyor, filling, and tensioning stations across industrial production lines. Placing the signal conversion near the sensor helps reduce interference that can build up on long analog cable runs. This layout is useful where very small bridge signals must remain stable during fast machine cycles.
Each channel employs a 24-bit delta-sigma converter, giving resolution down to 1.31 nV per least-significant bit at 2 mV/V scaling. A regulated 5.5 VDC bridge supply excites the sensors, and the converter completes one measurement cycle in 200 µs. Continuous acquisition runs at 5000 samples/s/channel, and the resulting stream passes through a third-order filter whose cutoff is 2.5 kHz with a slope of 60 dB per decade to attenuate high-frequency noise. This response supports tracking of rapid load changes while maintaining low-level accuracy in electrically noisy environments.
Thermal and electrical limits determine power budgeting and reliability. The analog front end dissipates 1.43 W, the bus interface needs only 0.01 W, and the internal I/O rail supplies an additional 1 W for housekeeping circuits. Excitation current stays below 65 mA/channel, keeping total bridge load predictable. A galvanic barrier rated at 500 Veff isolates field wiring from the backplane to help prevent fault propagation. Isolation between the field side and the backplane also helps protect the control system when wiring faults or ground-potential differences occur in the machine. Measurement stability over temperature is assisted by a maximum gain drift of 35 ppm/°C and an offset drift of 15 ppm/°C, helping the module maintain consistent readings during warm-up and normal ambient changes.
