Excellent PLC
Product Introduction
The Allen-Bradley 1746-NT8 is a thermocouple and millivolt analog input module developed for the SLC 500 programmable controller platform. It is designed to acquire accurate temperature and low-level voltage signals in industrial automation systems where measurement stability and signal integrity are critical.
This module provides eight independent input channels, allowing higher channel density compared to standard thermocouple modules. It supports direct connection of thermocouples and millivolt signal sources, reducing system complexity by eliminating the need for external signal conditioning devices. Integrated signal processing functions such as cold junction compensation and linearization are handled internally by the module.
Built to operate reliably in industrial control cabinets, the 1746-NT8 ensures consistent data acquisition under electrically noisy conditions. Its direct integration with SLC 500 processors makes it well suited for legacy systems, retrofit projects, and applications requiring expanded temperature or mV measurement capability without altering the existing control architecture.
Product Specifications
| Parameter | Description |
|---|---|
| Module Type | Thermocouple / Millivolt Analog Input Module |
| Series | SLC 500 |
| Number of Input Channels | 8 points |
| Supported Input Signals | Thermocouple signals and millivolt signals |
| Input Power Requirement | 24 VDC (via system/backplane support) |
| Analog-to-Digital Conversion | High-resolution conversion for temperature and mV signals |
| Cold Junction Compensation | Internal and automatic |
| Channel Configuration | Individually configurable channels |
| Electrical Isolation | Input-to-backplane isolation |
| Noise Immunity | Designed for high-noise industrial environments |
| Data Interface | Direct communication with SLC 500 processor |
| Module Placement | Any compatible I/O slot in SLC 500 chassis |
| Operating Mode | Continuous signal acquisition |
| Dimensions | 144.5 × 34.6 × 130.18 mm |
| Weight | 0.181 kg |
Applications
• Multi-point temperature monitoring, collecting data from multiple thermocouples in a single module
• Process automation systems, providing reliable temperature feedback for control loops
• Industrial furnaces and heaters, monitoring thermal conditions across different zones
• Manufacturing production lines, supervising temperature-sensitive processes
• Energy and utility systems, measuring thermal parameters in electrical and mechanical equipment
• Legacy SLC 500 installations, expanding analog temperature input capacity without controller replacement
Advantages
• High channel density, enabling eight measurement points within a single SLC 500 module
• Direct thermocouple and mV input support, minimizing external wiring and hardware
• Integrated cold junction compensation, improving overall temperature measurement accuracy
• Stable performance in noisy environments, ensuring reliable signal acquisition
• Flexible channel configuration, allowing adaptation to different sensing requirements
• Seamless SLC 500 compatibility, simplifying system integration and upgrades
• Reduced cabinet space usage, compared to multiple lower-channel-count modules
