The Allen-Bradley 1746-NT4 is a specialized thermocouple input module designed for the SLC 500 programmable logic controller system. This module provides four isolated input channels capable of interfacing with various thermocouple types, including B, E, J, K, N, R, S, and T, as well as millivolt signals in the 50 mV or 100 mV ranges. It serves as a critical component for precision temperature monitoring and analog data acquisition in industrial automation environments.
Features
4-channel thermocouple input capability.
Supports a wide range of thermocouple types (B, E, J, K, N, R, S, T).
Selectable input ranges for 50 mV or 100 mV signals.
Designed for seamless integration into the SLC 500 I/O chassis.
Provides high-resolution analog-to-digital conversion for temperature-sensitive processes.
Applications
This module is widely utilized in industrial processes requiring accurate temperature feedback, such as heat treatment furnaces, chemical reactors, food processing equipment, and HVAC control systems. It is suitable for both new installations and as a replacement unit for existing SLC 500 architectures.
Technical Specifications
Product Model
1746-NT4
Module Type
Thermocouple Input
Number of Channels
4
Supported Thermocouples
B, E, J, K, N, R, S, T
Input Ranges
50 mV, 100 mV
System Compatibility
SLC 500 Series
Manufacturer
Allen-Bradley
Installation Guidelines
Ensure the SLC 500 chassis power is disconnected before installing or removing the module.
Slide the module into the designated slot in the SLC 500 chassis and secure it using the top and bottom retaining screws.
Use shielded twisted-pair cabling for thermocouple connections to minimize electromagnetic interference (EMI).
Ensure proper grounding of the cable shields at the module end to maintain signal integrity.
Avoid routing signal cables near high-voltage power lines or high-frequency switching equipment.
Handle the module using proper ESD (Electrostatic Discharge) precautions to prevent damage to internal circuitry.
FAQ
Is the 1746-NT4 still in production?
No, the 1746-NT4 has been discontinued by the manufacturer. We provide high-quality surplus or refurbished units to support legacy system maintenance.
What thermocouple types are supported?
The module supports types B, E, J, K, N, R, S, and T, making it highly versatile for various industrial temperature sensing applications.
