1746-NR4 | Allen Bradley SLC 500 4-Channel RTD/Resistance Analog Input Module

Product Description

The Allen Bradley 1746-NR4 is an analog input module for the SLC 500 series, designed to interface directly with RTD sensors and resistance inputs. With four input channels, sigma-delta conversion, and high accuracy, it provides precise temperature and resistance measurement for industrial automation systems. The module supports a wide range of RTD types, multiple resistance ranges, and offers robust isolation for reliable operation in demanding environments.

Technical Specifications

• Manufacturer Allen Bradley

• Product Line SLC 500 Series

• Product Type RTD/Resistance Analog Input Module

• Part Number 1746-NR4

• Weight 0.56 lbs (0.26 kg)

• Inputs 4 channels

• Compatible RTD Sensors

• Platinum (385): 100, 200, 500, 1000 Ω

• Platinum (3816): 100, 200, 500, 1000 Ω

• Copper (426): 10 Ω

• Nickel (618): 120 Ω

• Nickel (672): 120 Ω

• Nickel Iron (518): 604 Ω

• Resistance Input Ranges 0–150 Ω, 0–300 Ω, 0–500 Ω, 0–1000 Ω

• Bandwidth 2.62–65.5 Hz

• Update Time 17 ms–1.2 s

• Resolution 0.01 °C

• Step Response 60 ms input, 2.5 ms output

• Input Accuracy ±0.642% (current), ±0.504% (voltage equivalent)

• Isolation Voltage 500 V for 1 minute

• Backplane Current Load 50 mA

• Power Consumption 1.5 W max (0.3 W @ 5 V DC, 1.2 W @ 24 V DC)

• Mounting Location Any chassis slot except Slot 0

• Operating Temperature 0–60 °C (32–140 °F)

• Storage Temperature –40–85 °C (–40–185 °F)

• Conversion Method Sigma-delta modulation

Application Scenarios

• Precision temperature monitoring using RTD sensors

• Resistance-based measurement in process control systems

• Industrial automation requiring accurate analog input for thermal management

FAQ

Q: How many input channels does the 1746-NR4 provide?  A: Four RTD/resistance input channels.

Q: Which RTD types are supported?  A: Platinum, copper, nickel, and nickel-iron sensors across multiple resistance values.

Q: Can the module be installed in any slot?  A: Yes, except Slot 0 in the SLC 500 chassis.

Comparable Models

• 1746-NR4: 4-channel RTD/resistance input (this model)

• 1746-NI4: 4-channel analog input module

• 1746-NT4: 4-channel thermocouple input module