1746-OA8 | Allen-Bradley SLC 500 Discrete AC Output Module

Product Overview

The Allen-Bradley 1746-OA8 is a fundamental discrete AC output module designed for the industry-standard SLC 500 PLC platform. Engineers utilize this module to directly control high-voltage AC field devices, such as motor starters, solenoid valves, and indicator lamps. It acts as the critical interface between the PLC's logic processor and the physical machinery on the factory floor. We supply this product as 100% Brand New and in original packaging, ensuring factory-sealed quality and seamless integration into your existing or new control systems.

Technical Specifications

Engineering Advantages

Versatile High-Voltage AC Control
The 1746-OA8 delivers reliable switching capabilities for a wide range of industrial voltages. It operates seamlessly across an 85 to 264 VAC range, allowing you to control both standard 120V and 240V AC loads with a single module. Each of the 8 output points handles a continuous current of 1.0 A (at 30°C) and withstands surge currents up to 10 A for 25 ms, providing the necessary headroom for inductive loads like relays and small contactors.

Robust Electrical Isolation and Protection
Engineered for durability, this module features isolated output groups to prevent ground loops and minimize electrical noise interference. The outputs are organized into two groups of four, offering enhanced fault isolation. If a short circuit occurs on one channel, the built-in protection helps contain the issue, preventing a total system shutdown and simplifying the troubleshooting process.

Straightforward Integration and Diagnostics
Installing the 1746-OA8 into your SLC 500 chassis is a quick, tool-free process. The module draws a standard 185 mA from the backplane, fitting easily into most power budget calculations. Furthermore, each output channel features a dedicated LED status indicator. These lights provide immediate visual feedback on the ON/OFF state of your field devices, allowing maintenance teams to rapidly diagnose wiring faults or load failures without needing a laptop.

FAQs

Q: What is the maximum load current for each output point?
A: At an ambient temperature of 30°C (86°F), each output point supports a continuous current of 1.0 A. If your cabinet temperature rises to 60°C (140°F), the maximum continuous current per point derates to 0.5 A to ensure safe operation.

Q: Can this module control both 120V and 240V devices?
A: Yes. The 1746-OA8 supports a wide operating voltage range of 85 to 264 VAC. This flexibility allows you to mix and match 120V and 240V AC field devices within the same module, provided they are grouped correctly.

Q: How does the module handle inrush currents from inductive loads?
A: The module is designed to handle transient spikes. Each output point can withstand a non-repetitive surge current of up to 10 A for a duration of 25 milliseconds, making it suitable for driving solenoids and relay coils without damage.