Product Overview
The Allen-Bradley 1746-NR4 is a SLC 500 RTD/Resistance Analog Input Module from Rockwell Automation. This module provides four (4) channels compatible with RTD sensors including Platinum (385), Platinum (3916), Copper (416), Nickel (618), Nickel (672), and Nickel Iron. It also accepts direct resistance inputs. Designed for fixed or modular SLC 500 systems, it delivers reliable temperature and resistance measurement for industrial automation.
Technical Specifications Breakdown
Key parameters for the 1746-NR4 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Module Type | RTD/Resistance Analog Input Module |
| Number of Inputs | Four (4) |
| Bandwidth | 2.62-65.5 Hertz |
| Update Time | 17 milliseconds-1.2 seconds |
| Backplane Current | 50 mA |
| Backplane Power Consumption | 1.5 W max (0.3 W at 5V dc, 1.2 W at 24V dc) |
| Operating Temperature | 0 to 60 degrees Celsius |
| Storage Temperature | -40 to 85 degrees Celsius |
| Resolution | .01 Deg. Celcius |
| Operating Isolation | 500 Volts/1 minute |
| A/D Conversion Method | Sigma-delta modulation |
Industry Applications
Its four channels allow simultaneous measurement from multiple RTD sensors, enabling precise zone control. The resistance input capability supports displacement measurement in pick-and-place mechanisms and clamping equipment, offering cost-effective process variable monitoring.
Installation & Setup Guidance
Install the module in any I/O chassis slot except Slot 0, which is reserved for the SLC 500 controller or adapter. The module automatically performs self-calibration when filter frequency, input type, or excitation current changes, or when a channel is enabled. No external power supply is needed; power is drawn from the backplane. Ensure wiring follows standard RTD and resistance input practices, and use the low-pass digital filter with programmable frequencies to reduce noise.
Maintenance & Reliability
The module operates reliably between 0 and 60 degrees Celsius and can be stored from -40 to 85 degrees Celsius. Its sigma-delta A/D conversion provides stable readings. Periodic inspection of connections and LED status indicators (one module status and four channel indicators) helps ensure proper operation. The 500 Volt isolation protects against ground loops and transient voltages.
Compatibility & Integration
The 1746-NR4 is compatible with fixed style SLC 500 systems using the 1746-A2 expansion chassis, as well as modular style local or remote I/O chassis. It supports RTD types: Platinum (385) 100, 200, 500, 1000; Platinum (3816) 100, 200, 500, 1000; Copper (426) 10; Nickel (618) 120; Nickel (672) 120; and Nickel Iron (518) 604. Resistance ranges include 0-150, 0-500, 0-1000, and 0-300 Ohms.
Selection Guide & Purchasing Advice
When selecting the 1746-NR4, verify your SLC 500 system configuration and required RTD types. AutoDCSTech offers this module with detailed support. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Troubleshooting & Common Issues
If a channel indicates out-of-range, check for broken sensor (shorted or open circuit). The module includes broken sensor detection for each input. Ensure filter frequency settings match application requirements to avoid measurement errors. If the module does not power up, verify backplane current (50 mA) and power consumption (1.5 W max).
Availability & Condition at AutoDCSTech
| Part Number | 1746-NR4 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
