Allen-Bradley - 1746-NT4 Analog Input Module

Allen-Bradley 1746-NT4 Thermocouple/mV Input Module

• Brand: Allen-Bradley
• Series: SLC 500 programmable controller family
• Model Number: 1746-NT4
• Module Type: 4-channel Thermocouple/mV analog input
• Input Channels: Four isolated thermocouple/mV inputs
• Resolution: 16-bit input, 14-bit output conversion
• A/D Conversion: Sigma-delta modulation method

Technical Performance Specifications

• The 1746-NT4 provides four independent measurement channels
• Update time is configurable from 26 milliseconds to 1.2 seconds
• Step response time is 60 milliseconds in, 2.5 milliseconds out
• Bandwidth ranges from 2.62 Hz to 65.5 Hz for signal filtering
• Built-in cold-junction compensation (CJC) sensors maintain accuracy
• Auto-calibration occurs at power-up and when channels enable
• Five status LEDs indicate module operation and individual channel status
• Selectable filter frequencies: 10 Hz, 50 Hz, 60 Hz, and 250 Hz

Sensor and Signal Compatibility

• Thermocouple Types: Supports J, K, T, E, S, R, B, and N sensors
• Millivolt Inputs: Compatible with ±50 mV and ±100 mV signals
• Each channel features configurable open circuit detection settings
• Open circuit response options: Zero, Upscale, or Downscale reading
• For thermocouples: Use shielded twisted extension wire specifically designed
• For mV signals: Recommended cable is Belden 8761 or equivalent
• Maximum cable impedance: 25 ohms for proper signal transmission
• Terminals accept two wires maximum at 2.5 mm (14 AWG) wire size

Electrical and Installation Specifications

• Backplane current: 60 mA at 5V DC and 40 mA at 24V DC
• Maximum power consumption: 0.8 watts total (0.3W at 5V DC, 0.5W at 24V DC)
• No external power supply required - powered from backplane only
• Install in any 1746 chassis slot except slot 0 (reserved for processor)
• Compatible with both fixed style and modular style SLC 500 hardware
• Block transfers required when used in remote I/O system configurations
• Four channels are isolated from the backplane for signal integrity

Environmental and Operational Details

• Operating temperature: 0°C to 60°C (32°F to 140°F)
• Storage temperature: -40°C to 85°C (-40°F to 185°F)
• Single-slot design maximizes space efficiency in control panels
• Ideal for temperature monitoring in harsh industrial environments

Frequently Asked Questions

• Where should I install this module in the chassis?
  Install the 1746-NT4 in any slot of a 1746 chassis except slot 0 for the processor.
• Does the module need separate power wiring?
  No external power is needed - it receives power from the SLC 500 backplane connection.
• How does cold-junction compensation work?
  Two built-in CJC sensors measure terminal temperature to compensate for reference junction effects.
• What happens if a thermocouple wire breaks?
  Configurable open circuit detection can force readings to zero, upscale, or downscale values.

Contact Information:
For technical specifications or purchasing assistance:
Email: sales@nex-auto.com
Phone/WhatsApp: +86 153 9242 9628

Partner: NexAuto Technology Limited