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

Product Description

The Allen-Bradley 1746-NT4 is a four-channel thermocouple and millivolt analog input module designed for the SLC 500 series. It provides isolated input channels with high-resolution conversion, supporting multiple thermocouple types and low-level millivolt signals for precise temperature and process monitoring.

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: SLC 500

• Part Number: 1746-NT4

• Weight: 0.63 lbs (0.28 kg)

• Module Type: Thermocouple/mV Analog Input

• Number of Inputs: 4 isolated channels

• Compatible Thermocouple Types: J, K, T, E, S, R, B, N

• Millivolt Signal Range: ±50 mV, ±100 mV

• Resolution: 16-bit input, 14-bit output

• Update Time: 26 ms to 1.2 s (depending on configuration)

• Step Response: 60 ms input, 2.5 ms output

• Backplane Current Load:

• 60 mA @ 5 V DC

• 55 mA @ 24 V DC

• Backplane Power Consumption: 0.8 W max (0.3 W @ 5 V DC, 0.5 W @ 24 V DC)

• Open Circuit Detection: Zero, Upscale, Downscale options

• I/O Chassis Location: Any slot except Slot 0

• Operating Temperature: 0–60 °C

• Storage Temperature: -40–85 °C

Features

• Supports multiple thermocouple types for flexible temperature measurement

• High-resolution conversion for accurate analog input processing

• Isolated input channels to reduce interference and improve signal integrity

• Configurable open-circuit detection for diagnostic reliability

• Compact design for integration into SLC 500 chassis

Application Scenarios

• Temperature Monitoring: Ideal for industrial processes requiring precise thermal measurement

• Process Control Systems: Provides accurate analog input for automation and monitoring

• Legacy SLC 500 Installations: Compatible with existing SLC 500 chassis for expansion or replacement

FAQ

• Q: How many input channels does the 1746-NT4 provide?  A: Four isolated input channels.

• Q: Which thermocouple types are supported?  A: J, K, T, E, S, R, B, and N.

• Q: Can it measure millivolt signals?  A: Yes, ±50 mV and ±100 mV ranges are supported.

• Q: Where can the module be installed in the chassis?  A: Any slot except Slot 0.

• Q: How does this compare to the 1746-NT8?  A: The 1746-NT4 supports 4 channels, while the 1746-NT8 provides 8 channels for higher density applications.