Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | 3AT350.6 |
| Product Family | AT350 |
| Manufacturer | B&R Industrial Automation (Austria) |
| Product Type | RTD Temperature Input Module |
| Automation Platform | B&R SYSTEM 2005 |
| Number of Inputs | 4 channels (resistance measurement) |
| Sensor Type | PT100 per IEC/EN 60751 |
| Wiring Configuration | 3-wire connection |
| Measurement Range | -50°C to +450°C |
| Internal Resolution | 13,500 steps |
| Conversion Method | Integrating A/D converter |
| Measurement Time per Channel | 20 ms (50Hz noise filter) or 16.67 ms (60Hz noise filter) |
| Total Conversion Time (all channels) | 100 ms (20ms mode) / 85 ms (16.67ms mode) |
| Input Filter | 2nd-order Bessel low-pass, 8 Hz cutoff |
| Basic Accuracy at 20°C | ±0.1% |
| Accuracy (0°C to +60°C) | ±0.2% |
| Linearization | Automatic inside module |
| Measurement Current | 2.5 mA (±0.2%) |
| Electrical Isolation | Input-to-PLC: Yes / Channel-to-Channel: No |
| Power Consumption | 5V DC: max 1W / 24V DC: max 3W / Total: max 4W |
| Output Data Format | INT |
| Status Indicators | RUN LED, 60Hz LED |
| Diagnostics | Yes, via LED status indicators |
| Mechanical Form Factor | B&R 2005 single-width |
| Required Terminal Block | 1× 3TB170.9 (screw) or 3TB170.91 (spring) – ordered separately |
| Protection Rating | IP20 per EN 60529 |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -25°C to +70°C |
| Operating Humidity | 5% to 95% relative humidity |
| Certifications | CE, UKCA, C-UL-US (E115267) |
| B&R ID Code | $93 |
Main Features and Advantages
The B&R 3AT350.6 delivers a focused yet powerful suite of temperature acquisition capabilities that position it as the definitive PT100 3-wire interface for B&R SYSTEM 2005 automation platforms, combining precision measurement, noise immunity, and industrial-grade robustness in a single compact module.Precision 3-Wire PT100 Acquisition:The B&R 3AT350.6 excels at eliminating lead-wire resistance errors inherent in 3-wire RTD installations. By exciting each PT100 with a precision 2.5mA (±0.2%) constant current source and employing an integrating A/D converter with 13,500 internal resolution steps, the module achieves ±0.1% basic accuracy at 20°C reference—degrading to only ±0.2% across the full 0°C to +60°C operating band. This measurement fidelity ensures that the B&R 3AT350.6 delivers laboratory-grade temperature data from field sensors located hundreds of meters from the control cabinet, without the signal degradation typically associated with long 3-wire runs.Adaptive Noise Filtering for Global Deployment:A standout feature of the B&R 3AT350.6 is its selectable per-channel measurement time—20ms optimizes rejection of 50Hz mains hum prevalent in European and Asian installations, while 16.67ms mode filters 60Hz interference common in North American power systems. Combined with a 2nd-order Bessel low-pass input filter at 8Hz cutoff frequency, the B&R 3AT350.6 rejects both low-frequency mains noise and high-frequency switching interference from nearby VFDs and contactors. The dedicated 60Hz LED provides instant visual confirmation of the currently active measurement mode, simplifying commissioning across global deployments.Galvanic Isolation for Signal Integrity:The B&R 3AT350.6 provides electrical isolation between the input channels and the PLC backplane, preventing ground loops, transient coupling, and signal interference from propagating between field wiring and the control system. While channel-to-channel isolation is not provided (a design choice that optimizes cost for PT100 applications where all sensors typically share a common reference), the input-to-PLC barrier ensures that the B&R 3AT350.6 maintains signal integrity even in electrically noisy industrial environments.Automatic Linearization and INT Data Format:The B&R 3AT350.6 performs automatic PT100 linearization inside the module, transforming raw resistance readings into engineering-unit temperature values per IEC/EN 60751 transfer curves. Output data is formatted as INT (integer) values ready for direct consumption by the SYSTEM 2005 CPU, eliminating the need for software-side linearization routines and reducing PLC scan time overhead. This hardware-level processing intelligence makes the B&R 3AT350.6 exceptionally efficient in multi-channel temperature monitoring applications.Comprehensive Onboard Diagnostics:The B&R 3AT350.6 incorporates LED-based status indication with two dedicated diodes: the RUN LED confirms active A/D converter operation, while the 60Hz LED displays the selected measurement time mode. This visual diagnostic capability, combined with the module’s converter-level fault reporting, enables maintenance personnel to quickly assess B&R 3AT350.6 health during routine inspections without requiring software connectivity—dramatically reducing mean time to diagnose (MTTD) during troubleshooting.Global Certification and Compliance:Carrying C-UL-US listing (E115267), CE marking, and UKCA certification, the B&R 3AT350.6 satisfies industrial control equipment standards across North American, European, and global markets. This multi-certification ensures the B&R 3AT350.6 can be deployed in safety-relevant and regulated industries—including pharmaceutical, food & beverage, and chemical process automation—without additional compliance hurdles.Compact Single-Width Form Factor:Occupying just one slot width in the SYSTEM 2005 backplane, the B&R 3AT350.6 maximizes I/O density in space-constrained cabinets. With a total power budget of just 4W maximum (1W from 5V rail, 3W from 24V rail), the module generates minimal heat, simplifying cabinet thermal management. The separate terminal block requirement (3TB170.9 or 3TB170.91) actually enhances field serviceability—the B&R 3AT350.6 can be hot-swapped while field wiring remains securely terminated on the removable TB170 terminal, drastically reducing replacement downtime.
