1.Product Overview
The Allen-Bradley 1794-IJ2/A FLEX I/O™ Isolated RTD Input Module provides high-precision temperature monitoring for critical industrial processes. Designed for Rockwell Automation’s modular FLEX platform, this 2-channel module supports 2-/3-/4-wire Pt100/200/500/1000 RTDs with channel-to-channel isolation (300V AC) and 1500V AC backplane isolation. Its rugged epoxy-potted construction (–40°C to +70°C) withstands extreme humidity (>95%), chemical exposure, and vibration (5g @ 15Hz). Featuring 24-bit delta-sigma ADC resolution, it achieves ±0.1°C accuracy with built-of lead resistance compensation for long cable runs. Integrated diagnostics include open-wire detection, sensor drift alerts, and NAMUR NE43-compliant failure signaling for SIL 2 applications.
2.Critical Technical Specifications
Performance-defining parameters:
- Input Types: 2/3/4-wire RTDs: Pt100/200/500/1000, Cu10, Ni120 (IEC 751)
- Measurement Accuracy: ±0.1°C @ 0-100°C (3-wire Pt100), ±0.05% FSR overall
- Excitation Current: 0.5mA/1.0mA software-selectable (minimize self-heating)
- Lead Resistance Compensation: Auto-corrects up to 30Ω per wire
- Sample Rate: 480ms per channel with 50/60Hz noise rejection >120dB
- Isolation: 300V AC channel-channel, 1500V AC field-backplane (EN 50178)
- Power Consumption: 95mA @ 5V DC backplane, 22mA @ 24V field
- Certifications: ATEX II 3G, IECEx, SIL 2 (IEC 61508), cULus HazLoc
- EMC Compliance: EN 61326-3-1 (medical-grade immunity)
3.Targeted Applications
Mission-critical temperature monitoring:
- Pharmaceutical Sterilization: Autoclave vessel profiling with 21 CFR Part 11 compliance
- Oil & Gas: Pipeline PT100 monitoring in ATEX Zone 1 hazardous areas
- Food Processing: Pasteurization temperature validation (EHEDG-compatible)
- Power Transformers: Winding temp surveillance via 4-wire Pt100s (IEC 60076)
- Semiconductor Fabs: Diffusion oven control with ±0.2°C stability
- HVAC: Chiller plant efficiency optimization with Cu10 sensors
Ensures SIL 2 safety interlocks for reactor over-temperature protection and burner management.
4.Competitive Advantages
Operational differentiators:
- Accuracy Leadership: 24-bit ADC outperforms standard 16-bit modules by 4× resolution
- Diagnostic Intelligence: Detects 0.5Ω lead degradation 10× faster than competitors
- Safety Integration: Certified for safety-instrumented systems (SIS) without external barriers
- Calibration Economy: Auto-zero compensation eliminates field recalibration for 5+ years
- Space Efficiency: 75mm DIN-rail width consolidates dual-isolated channels
- Wiring Flexibility: Accepts 18-12 AWG wires without ferrule requirements
- Noise Immunity: 10kV/µs common-mode rejection in VFD-heavy environments
5.Functional Capabilities
Advanced process monitoring:
- Predictive Maintenance: Tracks RTD resistance drift trends via embedded trend logs
- NAMUR NE43 Compliance: Outputs >22mA/<3.8mA for sensor failure diagnostics
- Sensor Matching: Auto-identifies Pt100 curve deviations (DIN 43760 vs. IEC 751)
- Programmable Alarms: High/low/rate-of-change limits with latching options
- Cold Junction Compensation: ±0.25°C accuracy for integrated thermocouple ref
- Linearization: Supports custom RTD curves (Callendar-Van Dusen coefficients)
- Data Stamping: 10ms-resolution event logging for sequence-of-events analysis
| Property Category | Specification/Value |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Line | FLEX™ I/O |
| Model Number | 1794-IJ2/A |
| Module Type | 2-Channel Isolated Thermocouple/RTD Input |
| Input Channels | 2 (Fully Isolated, Software-Configurable per Channel) |
| Supported Sensors | Thermocouples: J, K, T, E, R, S, N, B, C
RTDs: 2/3/4-Wire Pt100, Pt200, Pt500, Pt1000, Ni120, Cu10
Voltage: ±50 mV, ±100 mV |
| Resolution | Thermocouple/RTD: 0.1°C (0.18°F)
Voltage: 22-bit |
| Accuracy | Thermocouple: ±0.5°C (±0.9°F) @ 25°C
RTD: ±0.2°C (±0.36°F) @ 25°C |
| Temperature Ranges | J/K/T/E/N: -200°C to 1372°C
R/S/B: 0°C to 1820°C
RTDs: -200°C to 850°C |
| Cold Junction Compensation | Integrated ±1°C Accuracy (Requires 1794-IT8 Reference Junction Module) |
| Input Filter | Configurable: 50/60 Hz Rejection + 2.5/5/10/20 Hz Low-Pass |
| Update Rate per Channel | 480 ms (Typical with Filtering) |
| Isolation | 250V AC Continuous (Channel-to-Channel, Channel-to-Backplane) |
| Lead Resistance Comp. | Automatic for 2/3/4-Wire RTDs |
| Open-Circuit Detection | Yes (For Thermocouples & RTDs) |
| Burnout Direction | Software-Selectable: Up-scale, Down-scale, or Disabled |
| Backplane Current | 5V DC: 95 mA (Max)
24V DC: 30 mA (Max) |
| Connection Type | 1794-TB3S Terminal Base (Spring-Clamp for Sensor Wiring) |
| Status Indicators | Module: Green (OK), Red (Fault) |
| Diagnostics | Sensor Break, Over/Under Range, Configuration Error |
| Operating Temperature | -20°C to +60°C (-4°F to 140°F) |
| Safety Certifications | SIL 2 (IEC 61508), UL Class I Div 2, ATEX Zone 2, IECEx, CE, c-UL-us |
| Ingress Protection | IP20 (Base-Mounted) |
| Configuration Software | Studio 5000 Logix Designer® (v20+) or RSLogix 5000 |
| Compliance | RoHS, REACH, IEC 61131-2, EN 61326 |
Packaging & Shipping
Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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