B&R X20AI2322 X20 Series Analog Input Module

Product Overview

The X20AI2322 (X20AI2322) is a precision-engineered analog input module within the B&R X20 System architecture, designed for high-speed acquisition of current signals. Featuring 2 integrated channels supporting 0 to 20 mA and 4 to 20 mA ranges, this module is a critical component for monitoring industrial sensors such as pressure transducers, flow meters, and temperature transmitters. Utilizing SAR (Successive Approximation Register) conversion technology with a 12-bit resolution, the X20AI2322 delivers rapid data processing with a conversion time of just 300 µs for all inputs. Its differential input design and 3rd-order low-pass filtering ensure superior noise immunity, making it an ideal choice for high-accuracy process control in chemical, water treatment, and energy sectors.

Signal Processing and Hardware Logic

The X20AI2322 is built for reliability and signal integrity, featuring a sophisticated input stage designed to handle the rigors of industrial field interference.

• Differential Input Architecture: By measuring the difference between two signals, the module effectively cancels out common-mode noise, which is essential for long-distance current loops.

• SAR Conversion Technology: The Successive Approximation Register (SAR) procedure provides a perfect balance of high-speed sampling and consistent 12-bit precision.

• Advanced Filtering: An integrated 3rd-order low-pass filter with a 1 kHz cutoff frequency suppresses high-frequency interference before digitization.

• Robust Input Protection: The circuitry is shielded against accidental wiring with the supply voltage and can withstand permissible input signals up to ±50 mA.

Technical Specifications

Technical FAQs

How do I interpret the digital output format for a 4 to 20 mA signal?

The X20AI2322 uses an INT data type. The range is mapped from 0x0000 to 0x7FFF. With a resolution where 1 LSB = 4.883 µA, a 4 mA signal will result in a digital value of approximately 0x0333 (819 dec), while 20 mA will reach the full scale.

What is the benefit of the "Channel to Bus" isolation in this module?

The electrical isolation between the input channels and the internal X2X Link bus prevents high-voltage transients on the field side from damaging the PLC CPU or other sensitive backplane components. Note that while the channels are isolated from the bus, the two input channels are not isolated from each other.

Can the module detect a wire break or sensor failure?

Yes. When configured for the 4 to 20 mA range, the software can monitor for values falling below the 4 mA threshold (e.g., <3.8 mA) to trigger a "Wire Break" or "Sensor Error" alarm in the B&R Automation Studio environment.

Field Engineering & Installation Guide

• Loop Impedance Management: Ensure the total loop resistance, including the sensor and the X20AI2322 internal load (<400 Ω), does not exceed the driving capacity of your transmitter. If the load is too high, the 20 mA signal will saturate and provide inaccurate readings.

• Shielding Protocol: For high-accuracy 12-bit acquisition, use twisted-pair shielded cables. The shield should be connected to the functional ground (FE) at the X20 terminal block to minimize the impact of electromagnetic interference on the 1 kHz filter stage.

• Overload Configuration: Use the software parameters to define the "Output of digital value during overload." Setting this to a specific error constant allows your PLC logic to safely shut down processes if a sensor exceeds the ±50 mA permissible limit.

Engineering Advantages

The X20AI2322 stands out for its extremely low bus power consumption (0.01 W), allowing for high-density analog configurations without straining the system's power budget. The 2.5 kg shipping weight reflects the robust protective packaging used to preserve the factory calibration of the high-precision SAR converters. With its native integration into the X20 ecosystem, it supports advanced features like the X20 diagnostics, providing real-time feedback on module health and signal validity directly to the HMI.