Excellent PLC
Product Introduction
The Allen-Bradley 1746-NT4 is a thermocouple and millivolt analog input module designed for the SLC 500 control platform. It provides reliable temperature and low-level voltage signal acquisition for industrial monitoring and control applications where accuracy and signal stability are essential.
This module supports four independent input channels, allowing direct connection of thermocouples or low-level millivolt sources without the need for external signal conditioning. By integrating cold junction compensation and signal linearization within the module, the 1746-NT4 simplifies system architecture and improves overall measurement consistency.
Engineered for industrial environments, the 1746-NT4 offers robust noise immunity and stable performance in electrically harsh conditions. Its seamless integration with SLC 500 processors makes it a practical solution for legacy systems and existing installations that require dependable temperature or mV signal measurement without redesigning the control system.
Product Specifications
| Parameter | Description |
|---|---|
| Module Type | Thermocouple / Millivolt Analog Input Module |
| Series | SLC 500 |
| Number of Input Channels | 4 points |
| Input Signal Types | Thermocouple signals and low-level millivolt signals |
| Millivolt Input Range | ±50 mV or ±100 mV |
| Resolution | High-resolution analog-to-digital conversion for temperature measurement |
| Cold Junction Compensation | Internal, automatic |
| Input Isolation | Channel-to-backplane isolation |
| Noise Rejection | Designed for industrial electrical noise environments |
| Data Format | Digital values readable by SLC 500 processor |
| Backplane Current Consumption | Optimized for SLC 500 chassis |
| Module Location | Any valid I/O slot in SLC 500 chassis |
| Operating Mode | Continuous analog signal acquisition |
| Dimensions | 144.5 × 34.6 × 130.18 mm |
| Weight | 0.45 kg |
Applications
• Industrial temperature monitoring, acquiring thermocouple signals from heaters, furnaces, and thermal processes
• Process control systems, providing accurate temperature feedback for closed-loop control
• Manufacturing equipment, monitoring thermal conditions in machinery and production lines
• Energy and utility installations, collecting temperature data from electrical and mechanical assets
• Laboratory and test systems, measuring low-level millivolt signals with high stability
• Legacy SLC 500 systems, expanding analog input capability without controller replacement
Advantages
• Direct thermocouple connectivity, eliminating the need for external signal conditioners
• Integrated cold junction compensation, improving temperature measurement accuracy
• Support for millivolt inputs, enabling flexible use beyond temperature sensing
• Four-channel density, allowing multiple measurements in a single module
• Robust industrial design, suitable for electrically noisy environments
• Seamless SLC 500 integration, ensuring compatibility with existing control architectures
• Stable and repeatable measurements, supporting reliable long-term process control
