X20AT2222 B&R X20 System 2-Channel Temperature Measurement Module

Product Overview

The X20AT2222 (X20AT2222) is a high-precision temperature measurement module designed for the B&R X20 System, specifically engineered to interface with resistance temperature detectors (RTDs). This module features 2 channels capable of supporting PT100 and PT1000 sensors, offering exceptional accuracy and stability for thermal monitoring tasks. In industries such as plastics extrusion, food processing, and chemical reactor control, the X20AT2222 provides the critical feedback loop required to maintain narrow temperature tolerances. By integrating advanced filtering and linearized data conversion directly into the I/O stage, it ensures that high-resolution temperature data is transmitted to the PLC without the interference or signal degradation often associated with long-distance analog cabling.

Technical Configuration

The hardware architecture of the X20AT2222 is optimized for precision and versatility. It supports both 2-wire and 3-wire connection types, allowing for lead-wire resistance compensation in 3-wire setups to ensure measurement integrity over longer distances. The module utilizes high-resolution A/D converters with integrated 50 Hz and 60 Hz filters to eliminate mains frequency noise, which is vital for stable readings in industrial environments. Each channel is independently configurable for different sensor types and measurement ranges, providing flexibility for diverse thermal sensing requirements. The unit is fully integrated into the X20 backplane, drawing minimal power from the bus while providing comprehensive diagnostics, including wire-break and short-circuit detection for the connected sensors.

Technical Specifications

Technical FAQs

Does the X20AT2222 automatically compensate for lead-wire resistance?

Yes, when using a 3-wire connection configuration, the module automatically measures and compensates for the resistance of the sensor cables. This ensures that the displayed temperature reflects the actual sensor state rather than the electrical properties of the wiring.

What diagnostic features are available for troubleshooting sensor faults?

The module monitors each channel for "Open Circuit" (wire break) and "Short Circuit" conditions. If a fault is detected, a status bit is set in the I/O mapping of the PLC, and the corresponding channel LED will signal an error state for immediate identification.

Can I mix PT100 and PT1000 sensors on the same module?

Yes, each channel on the X20AT2222 is independently configurable within the Automation Studio hardware tree. You can define channel 1 as a PT100 input and channel 2 as a PT1000 input to suit your specific hardware requirements.

Engineering & Installation Guide

• Shielding and Noise Reduction: For maximum accuracy, especially with PT100 sensors which are sensitive to low resistance changes, use shielded twisted-pair cables. The shield should be grounded at the control cabinet entry point using a grounding clamp to prevent electromagnetic interference from high-power cables.

• 3-Wire Wiring Consistency: When utilizing 3-wire measurement, ensure that all three conductors have the same cross-section and are the same length. Discrepancies in wire resistance between the three leads can introduce a fixed offset error in the temperature calculation.

• Thermal Stabilization: Upon initial power-up or after replacing a sensor, allow the module and its connections to reach thermal equilibrium (approximately 5 to 10 minutes) before performing any precision calibration or critical process starts. This accounts for the internal heat dissipation of the module and stabilizes the cold-junction logic.