Allen-Bradley 1746-OA16 120/240VAC 16 Point Output Module

Product Overview

The Allen-Bradley 1746-OA16 is a 16-point discrete AC output module belonging to the SLC 500 modular I/O hardware system by Rockwell Automation. Designed for control of AC-powered actuators, solenoids, motor starters, and indicator lights, this module operates across a nominal 120/240 V AC supply voltage with a broad continuous operating range of 85 to 265 V AC (47–63 Hz).

Organized into two (2) individually isolated channels of eight (8) outputs each, the 1746-OA16 features optical coupling and integrated filter circuitry for signal noise suppression. Weighing approximately 0.38 kg (0.84 lbs), it installs into any single slot of an SLC 500 local or remote chassis, drawing 0.370 A (370 mA) from the 5.1 V DC backplane supply while providing convenient maintenance via removable terminal blocks (RTBs).

Core Technical Advantages

• Dual Grouped Channel Architecture: Configured with 16 AC output points split into two isolated groups of 8 channels, allowing distinct phase or voltage source control across banks.
• High Inrush Surge Handling: Supports surge currents up to 10.0 A per point for 25 ms, enabling safe switching of inductive loads without damaging output triacs.
• Removable Terminal Block (RTB) Design: Simplifies module replacement and field servicing without requiring the rewiring of individual field connections.
• Optical Noise Isolation & Status LEDs: Features full optical isolation between backplane logic and field side circuits, accompanied by front-panel status LEDs for rapid visual diagnostics.

Technical Specifications

Installation & Handling Guidelines

• Chassis Power Off: Always remove system power from the SLC 500 chassis before inserting or removing the 1746-OA16 module to prevent backplane damage.
• Terminal Block Removal: Utilize the release tabs on the Removable Terminal Block (RTB) to disconnect field wiring as a single unit when replacing hardware.
• Thermal Derating Verification: Ensure load currents stay under 0.25 A per point if cabinet operating temperatures exceed 30°C (86°F) up to the 60°C (140°F) threshold.

Technical FAQs

Q1: What is the continuous current rating per point for the Allen-Bradley 1746-OA16 module?
A1: It supports 0.50 A per point at 30°C, derating to 0.25 A per point at 60°C.

Q2: How much backplane current does the 1746-OA16 module draw?
A2: The module consumes 370 mA (0.370 A) at 5.1 V DC from the SLC chassis power supply.

Q3: Does the 1746-OA16 output module require wiring removal during replacement?
A3: No, it features a removable terminal block (RTB) that allows module swapping without disconnecting individual wires.