Allen-Bradley 1746-NT4 SLC 500 Thermocouple/mV Input Module

Product Overview

• The Allen-Bradley 1746-NT4 is a high-performance temperature sensing module.
• It belongs to the SLC 500 family for industrial automation tasks.
• This 1746-NT4 unit processes four independent analog input channels.
• It converts millivolt or thermocouple signals into digital data for processors.
• The 1746-NT4 module draws power directly from the SLC 500 backplane.
• Dual cold-junction compensation sensors ensure superior measurement accuracy for all inputs.

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Model: 1746-NT4
• Series: SLC 500
• Input Count: Four (4) isolated differential channels
• Measurement Range: Thermocouple types J, K, T, E, R, S, B, N
• Signal Compatibility: Direct +/- 50 mV and +/- 100 mV analog inputs
• Resolution: 16-bit analog-to-digital (A/D) conversion
• Frequency Response: Digital filters at 10Hz, 50Hz, 60Hz, or 250Hz
• Linearity: Advanced Sigma-Delta modulation for stable data processing
• Sensitivity: 14-bit output resolution for precise thermal tracking
• Temperature Range: 0 to 60 degrees Celsius for standard operation
• Environmental Tolerance: -40 to 85 degrees Celsius for safe storage
• Anti-Interference: Built-in noise rejection for AC power line frequencies

Global PLC Spare HUB’s Insight

• The 1746-NT4 provides exceptional flexibility for mixed-sensor environments.
• Engineers appreciate the individual channel filtering to handle specific site noise.
• Unlike basic modules, the 1746-NT4 uses dual CJC points for better stability.
• This hardware is ideal for high-reliability thermal loops in older systems.

Installation and Compatibility

• Chassis Placement: Install the 1746-NT4 in any slot except Slot 0.
• Processor Support: Compatible with all modular and fixed SLC 500 controllers.
• Wiring Guide: Use 14 AWG shielded twisted-pair wire for optimal signal integrity.
• System Requirements: Remote I/O racks require block transfer programming for this module.

Diagnostics and Maintenance

• Status Monitoring: Five front-panel green LEDs indicate module and channel health.
• Broken Sensor Detection: The 1746-NT4 identifies open circuits automatically.
• Fault Reactions: Configurable response settings include Zero, Upscale, or Downscale values.
• Ease of Calibration: Automatic self-calibration occurs at every power-up cycle.

Typical Application Scenarios

• Metal Processing: Accurate furnace temperature control using Type R and S sensors.
• Food Production: Oven monitoring with J and K type thermocouples.
• Scientific Testing: Precision millivolt data acquisition for laboratory sensor arrays.
• HVAC Control: Large-scale climate monitoring in industrial manufacturing facilities.

Shipping and Purchase Terms

• Fast Dispatch: Orders are processed and shipped within 24 to 48 hours.
• Courier Services: Reliable global delivery via FedEx, UPS, and DHL.
• Warranty Policy: Each 1746-NT4 includes a 12-month quality guarantee.
• Package List: Includes one 1746-NT4 module and integrated terminal block.

Frequently Asked Questions (FAQ)

• How do I resolve fluctuating readings on the 1746-NT4? Adjust the channel filter to 50Hz or 60Hz to block electrical interference.
• Does the 1746-NT4 support different thermocouples simultaneously? Yes, each of the four channels allows for an independent sensor configuration.
• What is the maximum cable impedance supported by this module? The 1746-NT4 maintains accuracy with up to 25 ohms of cable resistance.
• Selection Guide: When should I choose the 1746-NT4 over the NT8? Choose the 1746-NT4 when your application requires high-speed updates for fewer channels.

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