Allen-Bradley | 1746-NR4 Analog Input Module

Allen-Bradley 1746-NR4 RTD/Resistance Input Module

• Brand: Allen-Bradley
• Series: SLC 500 programmable controller system
• Model Number: 1746-NR4
• Module Type: 4-channel RTD/Resistance analog input
• Input Channels: Four isolated RTD/resistance inputs
• A/D Conversion: Sigma-delta modulation method
• Temperature Resolution: 0.01° Celsius

Technical Performance Specifications

• The 1746-NR4 module provides four independent input channels
• It supports multiple RTD types including Platinum, Copper, Nickel, and Nickel Iron
• Measurement range covers from -200°C to 850°C for temperature sensing
• Update time is configurable between 17 milliseconds and 1.2 seconds per channel
• Bandwidth ranges from 2.62 Hz to 65.5 Hz with programmable low-pass digital filtering
• The module features automatic self-calibration when parameters change
• Built-in broken sensor detection identifies open or short circuit conditions
• Five status LEDs provide module and individual channel health indication

Sensor and Input Compatibility

• Platinum RTDs: 385 and 3916 curves with 100, 200, 500, 1000 ohm values
• Copper RTDs: 426 curve with 10 ohm resistance
• Nickel RTDs: 618 and 672 curves with 120 ohm resistance
• Nickel Iron RTDs: 518 curve with 604 ohm resistance
• Direct Resistance Inputs: 0-150Ω, 0-300Ω, 0-500Ω, 0-1000Ω ranges
• Resistance inputs measure displacement, position, or other process variables
• The module provides proper excitation current for all connected sensors

Electrical and Safety Specifications

• Backplane current requirement is 50 mA at both 5V DC and 24V DC
• Maximum power consumption measures only 1.5 watts total
• Isolation rating is 500V DC for 1 minute between inputs and backplane
• Maximum common-mode voltage tolerance is ±1 volt
• Maximum permanent overload protection: ±5V DC or ±5 mA
• No external power supply needed - powered entirely from backplane
• Step response time is 60 milliseconds in, 2.5 milliseconds out

Environmental and Installation Details

• Operating temperature range is 0°C to 60°C (32°F to 140°F)
• Storage temperature range is -40°C to 85°C (-40°F to 185°F)
• Install in any 1746 chassis slot except slot 0 (reserved for processor)
• Compatible with fixed style and modular style SLC 500 hardware
• Works with 1746-A2 expansion chassis for system flexibility
• Supports both local chassis and remote I/O configurations
• Compact design saves valuable control panel space

Packaging and Shipping Information

• Every 1746-NR4 module ships as new and factory original
• All items come complete in manufacturer packaging with documentation
• We maintain stock for immediate shipment after order confirmation
• Standard processing and shipping time is within 5 business days
• Available shipping carriers include FedEx, UPS, and DHL services
• Return policy accepts qualified returns within 30 days of delivery

Frequently Asked Questions

• What sensors work with the 1746-NR4 module?
  The 1746-NR4 supports Platinum, Copper, Nickel, and Nickel Iron RTDs, plus direct resistance inputs up to 1000 ohms.
• How many temperature sensors can I connect?
  You can connect up to four separate RTD sensors, one to each of the module's input channels.
• What is the temperature measurement resolution?
  This module provides high precision with 0.01° Celsius resolution for accurate temperature monitoring.
• Can I measure resistance directly without RTDs?
  Yes, the module accepts direct resistance inputs in ranges from 0-150Ω to 0-1000Ω for various applications.
• Where do I install this module in the chassis?
  Install the 1746-NR4 in any slot of a 1746 chassis except slot 0, which is for the processor only.
• Does the module need separate power wiring?
  No, the module receives all necessary power directly from the SLC 500 backplane connection.
• How does the module handle sensor failures?
  Built-in diagnostics detect open or shorted sensors and report these conditions to the controller.