X20AI2237 B & R Automation
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The B & R Automation X20AI2237 is part of the X20 Fieldbus Input Output Modules series and features two differential analog inputs with a ±10 V input range. The module offers a 15-bit converter resolution, data output rate of 10,000 samples per second, and input impedance of 20 MΩ. It also provides sensor supply voltage of 25 V and supports a maximum permissible input signal of ±30 V.
Internal Product Review
The X20AI2237 is a B & R Automation analog input module with 2 differential analog inputs and a ±10 V input range. A ±15-bit converter resolution with a 10000 Samples/s data output rate gives signal acquisition strong precision and fast response. Low 0.05 W bus power consumption makes the module an efficient choice for compact fieldbus I/O assemblies.
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Product Description:
B&R Automation manufactures the X20AI2237 analog input module for the X20 Fieldbus Input Output Modules series. Designed for voltage-based sensing, the unit offers two differential input channels that sit directly on the backplane of an X20 node. By digitizing field voltages and forwarding the results across the real-time bus, it supplies a controller with fast, noise-immune analog data needed for closed-loop tasks.
Each channel accepts an input range of ±10 V, allowing sensors or transmitters to swing symmetrically around ground while staying within the converter limits. A high input resistance of 20 MΩ prevents the module from loading low-power sources, so signal accuracy is preserved. The analog front end feeds a sigma-delta converter that provides ±15-bit resolution, which supports fine adjustment during calibration. After conversion, results are streamed at a data output rate of 10 000 samples/s, which is fast enough to follow dynamic test stands or vibration studies. Overall span fidelity is kept within a gain error of just 0.013%, minimizing scaling corrections inside the controller program.
Signal integrity is further reinforced by a common-mode rejection of 84 dB, letting the differential architecture suppress ground shifts up to the specified ±14 V common-mode window. An internal anti-aliasing filter with a cutoff of 10 kHz aligns with the sampling rate to block higher-frequency noise without adding phase delay. The electronics draw only 0.05 W from the X20 backplane, so thermal rise inside densely populated racks remains low. Dielectric strength between field channels and the bus is verified to 1000 VAC, and an allowable ±30 V overvoltage margin protects against wiring mistakes. The module can source up to 30 mA at 25 V ±2% for external sensors, and nonlinearity stays below 0.003%.
