SLC 500 (1746 Series) | Allen-Bradley | 1746-NR4 RTD Input Module

Product Description: Allen-Bradley 1746-NR4

The Allen-Bradley 1746-NR4 is a 4-channel analog input module for the SLC 500 platform, designed to interface with RTD temperature sensors. It supports multiple platinum and nickel RTD types, including Pt100, Pt200, Pt500, Pt1000, and Ni100, in various wiring configurations (2-, 3-, and 4-wire). This module is ideal for accurate and stable temperature monitoring in process control and industrial automation systems.

Key Features

• 4 individually configurable RTD input channels
• Supports 2-, 3-, and 4-wire RTD connections
• Compatible with Pt100, Pt200, Pt500, Pt1000, Ni100 RTDs
• Channel-specific scaling, status, and fault detection
• High accuracy and resolution for precise temperature control
• Removable terminal block simplifies field wiring
• Compatible with all standard 1746 SLC chassis

Technical Specifications

• Number of Channels: 4
• Supported RTD Types:
  • Platinum: Pt100, Pt200, Pt500, Pt1000 (DIN/IEC 751)
• Resistance Ranges: 0–400 Ω and 0–4000 Ω
• Resolution: 14–15 bits (depending on range and configuration)
• Accuracy: ±0.5°C typical
• Input Impedance: >1 MΩ
• Input Isolation: Channel-to- backplane: 1500V AC; no channel-to-channel isolation
• Backplane Current Draw:
  • 120 mA @ 5V DC
• Operating Temperature: 0°C to 60°C
• Certifications: UL Listed, CE, CSA, RoHS, Class I Div 2

Application Areas

• Process control and temperature monitoring
• Food, beverage, and pharmaceutical production
• HVAC systems and cleanroom environments
• Chemical and petrochemical industries
• OEM machinery requiring precise thermal feedback

Advantages

• Supports a wide range of RTD types for application flexibility
• High-resolution measurement ensures accurate temperature control
• Diagnostic features reduce downtime and simplify troubleshooting
• Compact module design conserves panel space
• Seamless integration with the SLC 500 automation platform