Allen-Bradley | 1746-NO4I SLC 500 Analog Output Module

Overview

The Allen-Bradley 1746-NO4I is a precision analog output module designed for SLC 500 PLC systems. It provides four independent analog output channels with high-resolution 14-bit conversion, fast update time, and reliable current output for industrial control applications.

Technical Specifications

• Model / Part Number: 1746-NO4I

• Brand: Allen-Bradley

• Product Type: Analog Output Module / SLC 500 Module

• Number of Outputs: 4 independent channels

• Output Current Range: 0 to +20 mA

• Full Scale Output: 21 mA

• Overrange Capability: 5% (0 to +21 mA minus 1 LSB)

• Current Output Coding: 0 to +32764

• Resolution: 14 bits

• Update Time: 512 microseconds

• Step Response Time: 2.5 milliseconds

• Backplane Current: 5 V: 55 mA, 24 VDC: 195 mA

• Weight: 1.0 lbs (0.45 kg)

• Series: SLC 500

Application Scenarios

• Precision control of actuators and valves in process automation

• Signal generation for analog control loops in SLC 500 PLC networks

• Industrial monitoring systems requiring fast analog output response

• Replacement or expansion of existing Allen-Bradley SLC 500 analog outputs

Comparison with Similar Models

• 1746-NO4I vs 1746-NO4V: The NO4I provides isolated analog outputs with 14-bit resolution, while the NO4V offers voltage outputs for systems needing 0–10 V control signals.

• SLC 500 Analog Modules: NO4I is optimized for fast response and high-precision current control, suitable for critical loop applications.

FAQs

Q1: What is the maximum update speed for the outputs?
The 1746-NO4I has an update time of 512 microseconds per channel, enabling rapid analog signal changes.

Q2: Can this module be used in existing SLC 500 racks?
Yes, it is fully compatible with standard SLC 500 backplanes and requires only the specified backplane current.

Q3: What is the resolution and accuracy of the output?
The module features 14-bit resolution, providing precise current outputs with minimal error over the full 0–20 mA range.