Product Summary
The Allen-Bradley 1746-NR4 is a high-performance RTD input module for SLC 500 systems. This unit provides four backplane-isolated channels for accurate temperature monitoring. It supports Platinum, Nickel, Copper, and Nickel Iron sensors. Engineers use this module to interface resistance temperature detectors directly with their control system. Its sigma-delta conversion method ensures reliable data.
Expert Technical Evaluation & Performance Review
The 1746-NR4 module uses sigma-delta modulation for its A/D conversion. This method delivers high-resolution data with a precision of 0.01 °C. The module offers a programmable low-pass digital filter. You can set the filter bandwidth from 2.62 to 65.5 Hertz. This flexibility allows you to reduce electrical noise on your signals. The update time varies from 17 milliseconds up to 1.2 seconds.
This module handles a wide range of RTD sensor types. It works with Platinum (385) and Platinum (3916) sensors. It also supports Copper (426), Nickel (618), Nickel (672), and Nickel Iron (518) probes. The 1746-NR4 can measure temperatures from -200°C to 850°C. It also accepts direct resistance inputs from 0 to 300, 500, 1000, and 1500 Ohms. This versatility makes it suitable for many industrial processes.
The module provides excellent electrical isolation for system protection. It offers 500 Volts DC of optical isolation for one minute. This isolation exists between the inputs and the chassis ground. It also protects the inputs from the backplane. The unit operates reliably in temperatures from 0 to 60 degrees Celsius. You can store it safely in temperatures from -40 to 85 degrees Celsius.
Each of the four input channels includes broken sensor detection. The 1746-NR4 automatically detects shorted or open circuits. When it finds an error, the module indicates an out-of-range condition. This feature helps you quickly identify faulty wiring or failed sensors. The module also performs automatic self-calibration. It recalibrates when you change the filter frequency or input type.
The 1746-NR4 draws a backplane current of 50 mA at both 5V DC and 24V DC. Its maximum power consumption is only 1.5 Watts. This low power draw makes it an efficient choice for your chassis. You can install this module in any I/O slot except Slot 0. It works with both fixed and modular SLC 500 hardware styles. Five LED indicators show the module status and each channel's condition.
Logistics & Standard Packaging Details
- One (1) Allen-Bradley 1746-NR4 RTD/Resistance Analog Input Module
- The module ships in an anti-static protective bag
- Standard packaging includes a cardboard box for transit safety
- We offer express delivery shipping via FedEx, UPS, and DHL
- Contact our sales team for bulk order shipping rates
