B&R X20AT2222

Core Technical Specifications

• Channel Quantity: 2 independent RTD measurement channels
• Supported Sensor Types: Pt100, Pt1000 (compliant EN 60751 standard)
• Temperature Measurement Range: -200°C ~ +850°C
• Resistance Direct Measurement Range: 0.1Ω ~ 4500Ω
• Wiring Mode Configurable: 2-wire, 3-wire per channel software switchable
• Channel-Bus Isolation Voltage: 500 V effective AC isolation
• Input Low-Pass Filter: First-order filter, cutoff frequency fixed 500Hz
• Measurement Resolution: 16-bit high precision ADC conversion
• Sensor Fault Diagnosis: Open circuit, short circuit, over-temperature range real-time detection
• Module Bus Supply: 24 VDC X20 system backplane bus power supply
• Operating Temperature: -20°C ~ +60°C
• Protection Class: IP20 (cabinet installation only)
• Dimensions: 24mm width × 100mm height × 72mm depth, weight 65g

Functional Features

1. Per-channel independent sensor type configuration, mixed Pt100 and Pt1000 sensors on single module supported
2. Built-in internal standard Pt linearization algorithm, output direct temperature value without upper program conversion
3. Independent channel open-circuit diagnostic function; trigger module channel fault flag once thermal resistance wire broken
4. 500V electrical isolation between field sensor channel and X20 internal backplane bus, eliminate ground loop signal noise
5. Compatible with X20TB6 6-pin or X20TB12 12-pin spring terminal blocks, fast pluggable wiring without screwdriver
6. Module front panel per-channel LED status indicators: normal measurement, open circuit fault, over-range alarm
7. High anti-interference EMC design, stable temperature sampling under inverter and motor electromagnetic noise environment
8. Seamless data communication with B&R X20 CPU via X-Bus high-speed backplane bus, microsecond-level data refresh cycle

Working Principle

1. 24VDC backplane bus supplies power to module internal ADC sampling circuit; constant small measurement current output to Pt100/Pt1000 thermal resistance sensor.
2. Thermal resistance resistance value changes linearly with ambient temperature; module high-precision ADC converts resistance voltage drop signal into digital value.
3. Internal chip executes EN 60751 standard Pt linearization algorithm to convert raw resistance data into direct temperature numerical value transmitted to X20 CPU via X-Bus backplane.
4. Real-time circuit detection circuit judges sensor wire open/short circuit state; set channel fault bit in bus data register once abnormal wiring detected, front panel fault LED lights up synchronously.
5. Built-in 500Hz low-pass filter suppress high-frequency electromagnetic interference noise on sensor signal line to ensure stable temperature sampling value.

Structure & Material Composition

• Module Housing: Flame-retardant gray PA66 plastic injection molding, integrated X20 bus backplane clamping buckle
• Internal PCB: Miniature high-density FR4 circuit board, isolated transformer separation between field channel and bus circuit
• Terminal Connection Interface: Spring-type quick plug terminal socket, compatible X20TB series removable terminal blocks
• Indicator Window: Transparent polycarbonate front panel window, independent LED for each channel status display

Installation Requirements

1. Plug into B&R X20 series backplane base station, horizontal DIN rail cabinet installation, module width only 24mm high density layout
2. Thermal resistance sensor wiring use shielded twisted compensation wire, cable length ≤ 100m, shield single end grounded at module terminal block
3. Separate temperature signal wiring from power/inverter cable trunking, routing distance ≥ 20cm to avoid interference
4. Do not install module close to heat source such as heating pipes, cooling fan required if cabinet ambient temperature over 50°C
5. X20TB terminal block spring clamp wire insertion depth ≥ 8mm, ensure complete wire contact inside spring clip

Application Scenarios

Operation & Maintenance Precautions

1. Do not plug/unplug module under live backplane bus power; power off CPU base station before module replacement
2. Pt100/Pt1000 sensor wiring cannot be mixed on single channel, must set corresponding sensor type via B&R Automation Studio software
3. Regularly check terminal block spring clamping tightness every 6 months; loose wire causes temperature sampling jump fluctuation
4. Do not use unshielded single-core wire for long-distance temperature signal transmission, severe electromagnetic noise will lead to measurement deviation
5. Module cannot be used in environment with condensation water vapor inside cabinet; water vapor will damage isolation circuit and cause short-circuit