1746-NT8 Allen-Bradley SLC 500 Thermocouple Module

1746-NT8 Allen-Bradley SLC 500 Thermocouple/mV Analog Input Module

• Brand: Allen-Bradley
• Model: 1746-NT8
• Series: SLC 500
• Module Type: Thermocouple/mV Analog Input Module
• Number of Inputs: Eight (8)

Technical Specifications

• Input Types: Supports J, K, T, E, S, R, B, N thermocouples plus ±50 mV and ±100 mV signals.
• Resolution: 16 bits input resolution with 14 bits output resolution.
• Backplane Current Draw: 120 mA at 5V DC and 70 mA at 24V DC.
• Backplane Power Consumption: 2.28W maximum (0.6W at 5V DC + 1.68W at 24V DC).
• Update Time: Ranges from 356 milliseconds to 4.05 seconds depending on filter settings.
• Step Response: 60 milliseconds for input, 2.5 milliseconds for output.
• A/D Conversion Method: Sigma-delta modulation with a digital low-pass filter.
• Normal Mode Rejection: Greater than 100 dB at 50-60 Hz between terminals.
• Common Mode Rejection: Greater than 100 dB at 50-60 Hz between inputs and ground.
• Input Impedance: Greater than 10 M Ohms.
• Open Circuit Detection: Selectable options include Zero, Upscale, or Downscale.
• Overvoltage Protection: ±30V DC continuous, 600W pulsed for 1ms.
• Isolation Rating: 500V DC for 1 minute between inputs and chassis ground, also between inputs and backplane.
• Cold-Junction Compensation (CJC): Two built-in CJC sensors with ±1.72°C accuracy.
• Operating Temperature: 0°C to 60°C (32°F to 140°F).
• Storage Temperature: -40°C to 85°C (-40°F to 185°F).
• Humidity Tolerance: 5% to 95% non-condensing.
• Certifications: UL and CUL approved.
• Status Indicators: Nine green LEDs show channel status and module health.

Compatibility and Installation Guide

• Works with all SLC 500 processors including SLC 5/01, 5/02, 5/03, 5/04, and 5/05.
• Installs in any I/O chassis slot except Slot 0. Slot 0 is reserved for the CPU or communication adapters.
• For fixed style systems, use the 1746-NT8 with a 1746-A2 chassis.
• For modular systems, place the 1746-NT8 in any open slot after the controller.
• Uses the 1746-RT34 removable terminal block (RTB) for wiring field devices.
• External input devices must have less than 100 Ohms impedance to meet accuracy specifications.
• The module auto-calibrates approximately every 2 minutes after power-up.

Frequently Asked Questions (FAQ)

• Is the 1746-NT8 brand new and original?
  Yes, we supply only brand new original Allen-Bradley modules.
• Do you have the 1746-NT8 in stock?
  Yes, we keep this model in stock and ready to ship.
• How fast will you ship?
  We ship within 5 days after order confirmation.
• Which carriers do you use?
  We use FedEx, UPS, and DHL for reliable worldwide delivery.
• Can I return this module?
  Yes, we accept returns within 30 days of receipt.
• Does the 1746-NT8 work with a fixed SLC 500 system?
  Yes, it works with both fixed and modular SLC 500 systems.
• What happens if a thermocouple wire breaks?
  The module detects the open circuit and reports it via your selected upscale, downscale, or zero setting.
• Do I need external CJC sensors?
  No, the 1746-NT8 includes two CJC sensors on the terminal block.

For further inquiries, please contact us at sales@nex-auto.com or call +86 153 9242 9628 (WhatsApp).

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