Allen-Bradley 1746-NIO4I SLC 500 Analog Combination Module

Overview

The 1746-NIO4I is an SLC 500 four-channel analog I/O combination module by Allen-Bradley. It features two (2) voltage or current input channels and two (2) current output channels in a single slot module. Designed for SLC 500 fixed or modular hardware, this module delivers precise analog control and measurement for industrial applications.

The 1746-NIO4I utilizes a Sigma-Delta ADC converter for high-resolution signal acquisition, offering exceptional accuracy, repeatability, and linearity. Its robust design includes overvoltage protection, field-to-backplane isolation, and reliable performance across a wide temperature and humidity range.

Technical Specifications

General Information

• Manufacturer: Rockwell Automation

• Brand: Allen-Bradley

• Part Number/Catalog No.: 1746-NIO4I

• Series: SLC 500

• Module Type: Analog Combination Module

• Number of Inputs: 2

• Number of Outputs: 2

Input Specifications

• Input Signal Ranges: -20 to +20 mA; -10 to +10 V DC

• Input Resolution: 16 bits

• Current Impedance: 250 Ω

• Voltage Impedance: 760 kΩ

• Step Response: 60 ms

• Update Time: 512 μs

• Bandwidth: 10 Hz

• Accuracy: ±0.642% at 0–60°C

• Drift Accuracy: ±79 ppm/5°C

• Maximum Gain Error: ±0.556%

• Maximum Drift Error: ±67 ppm/°C

Output Specifications

• Output Type: Current

• Normal Output Range: 0–20 mA

• Over-Range Capability: 5%

• Resolution: 2.56348 μA per LSB

• Output Accuracy: ±0.541%

• Drift Accuracy: ±70 ppm/°C

• Gain and Offset Error: ±0.516% and ±12 LSB

• Load Capacity: 0–500 mA

Electrical Specifications

• Backplane Current (24V): 145 mA

• Backplane Current (5V): 55 mA

• Overvoltage Rating: 220 VAC RMS or 220 VDC continuous

• Tested Isolation: 500 V between field wiring and backplane

Physical and Environmental Specifications

• Dimensions: Standard SLC 500 form factor

• Operating Temperature: 0–60°C

• Humidity: 5–95% non-condensing

Additional Features

• Common mode voltage: -20 to +20 V

• Normal mode rejection: 55 dB at 60 Hz

• Common module rejection: 105 dB at 60 Hz

• Compatible with field instruments such as transmitters, controllers, VFD feedback signals, modulating valves, panel meters, and signal isolators.

The 1746-NIO4I is a high-precision, dual-input/dual-output analog module ideal for industrial automation applications requiring reliable signal acquisition and analog control within SLC 500 systems.