Allen-Bradley 1746-NR8 RTD Input Module – Temperature Measurement SLC 500

Allen-Bradley 1746-NR8: Precision RTD/Resistance Input Module

Measure temperature and resistance accurately with the Allen-Bradley 1746-NR8 analog input module. This versatile 8-channel module supports various RTD sensors and resistance inputs for SLC 500 systems. The 1746-NR8 delivers reliable measurements for industrial temperature monitoring applications.

Product Overview

The Allen-Bradley 1746-NR8 is a specialized analog input module for SLC 500 systems. This 1746-NR8 module features eight channels that accept RTD temperature sensors and direct resistance inputs. It’s ideal for temperature monitoring and applications requiring precise resistance measurements.

Technical Specifications

Brand: Allen-Bradley (Rockwell Automation)
Series: SLC 500
Model: 1746-NR8
Module Type: 8-Channel RTD/Resistance Input
Input Channels: 8 configurable channels
RTD Types: Platinum (385, 3916), Copper (416), Nickel (618, 672), Nickel Iron
RTD Values: 10Ω, 100Ω, 120Ω, 200Ω, 500Ω, 604Ω, 1000Ω
Resistance Ranges: 0-150Ω, 0-300Ω, 0-500Ω, 0-1000Ω
Resolution: 0.01°C (temperature), 16-bit (resistance)
Update Time: 6 ms to 2 s (configurable)
Backplane Current (5V): 100 mA
Backplane Current (24V): 55 mA
Power Consumption: 1.82 W maximum
Wiring Options: 2-wire, 3-wire, 4-wire RTD connections
Isolation: 500V AC for 1 minute
Common Mode Voltage: ±1V maximum
Operating Temperature: 0 to 60°C (32 to 140°F)
Storage Temperature: -40 to 85°C (-40 to 185°F)
Conversion Method: Sigma-delta modulation
Auto-Calibration: On power-up or programmable cycle

Warranty & Shipping

All purchases include a 12-month warranty covering defects and performance issues. We ship globally using reliable carriers including FedEx, UPS, and DHL for fast delivery.

Comparison With Similar Products

Consider these alternative modules for your system:
Allen-Bradley 1746-IV32 (32-Point DC Input Module)
Allen-Bradley 1746-FIO4V (Analog Combination Module)

Frequently Asked Questions

• What is the difference between 2-wire, 3-wire, and 4-wire RTD connections?
  2-wire is simplest but least accurate; 3-wire compensates for lead resistance; 4-wire provides highest accuracy by eliminating lead resistance effects.
• How often does the module auto-calibrate?
  It auto-calibrates on power-up and can be programmed to calibrate every 5 minutes for maintained accuracy.
• What applications is this module designed for?
  Temperature monitoring in processes, machinery, environmental control, and any application requiring precise resistance measurements.
• Can I mix different RTD types on the same module?
  Yes, each channel can be independently configured for different RTD types or resistance ranges.
• What cable should I use for long distance runs?
  Use lower resistance cable (AWG #16 instead of #24) and consider 3-wire or 4-wire configurations for better accuracy over long distances.

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