Allen-Bradley 1746-NO8I – SLC 500 Analog Output Module

Overview

The Allen-Bradley 1746-NO8I is an Analog Output Module designed for the SLC 500 controller platform. It features eight (8) current output channels providing an output range of 0 to +20 mA. This module is compatible with both fixed and modular SLC 500 hardware, making it suitable for a variety of industrial automation applications.

The module is ideal for precise current signal output and can be installed in local, expansion, or remote I/O racks, except for slot 0 in certain configurations where reserved slots exist for the CPU or communication adapters. Proper installation requires attention to ambient temperature and electrical noise to ensure optimal performance.

Technical Specifications

• Manufacturer: Rockwell Automation

• Brand: Allen-Bradley

• Part Number/Catalog No.: 1746-NO8I

• Series: SLC 500

• Module Type: Analog Output Module

• Number of Outputs: Eight (8) Current Output Channels

• Output Current Range: 0 to 20 mA; 4 to 20 mA; 0 to 21 mA; 0 to 21.5 mA

• Backplane Current: 5 V: 120 mA; 24 V: 250 mA

• Resolution: 16 bits

• Data Format: Scaled engineering units; PID scaling; Proportional counts; 1746-NO4 format; User-defined scale

• Voltage Output Coding: -32,768 to +32,764

• Update Time: Class 1: 5 ms; Class 3: 10 ms

• Step Response: 1 ms (0 to 95% of full scale)

• Thermal Dissipation: 6.6 W

• Ambient Operating Temperature: 0 to 60 °C

• Wire Size: Two 14–24 AWG wires per terminal

• UPC: 10781180054560

Installation Considerations

• Install in a chassis slot away from high-voltage AC or DC sources to reduce electrical noise.

• Place the module closer to the bottom of the enclosure for better cooling due to heat generation.

• Compatible with modular, local, expansion, and remote I/O racks, except slot 0 restrictions in certain configurations.

Description

The 1746-NO8I module provides high-precision current output for industrial control systems. It supports both fixed and modular SLC 500 hardware, allowing flexible deployment in small, medium, and large applications. With careful installation and proper cooling, it ensures reliable performance while integrating seamlessly with other SLC 500 system components.