Product Overview

The Allen-Bradley 1746-OV8/A​ is a fundamental 8-channel discrete DC output module from the prolific SLC 500 modular I/O system. This module functions as a critical interface between the programmable logic controller’s (PLC) logic solver and real-world DC actuation devices. Its primary role is to convert low-voltage digital command signals from the SLC 500 processor into robust, switched 24V DC power outputs capable of directly driving industrial loads. Each of the eight output channels acts as an independent electronic switch (sinking type) that closes to complete the circuit to ground, allowing current to flow from an external 24V DC supply through the connected load and into the module. The Allen-Bradley 1746-OV8/A​ is engineered for reliability and simplicity, providing a standardized method to command a variety of field devices such as relay coils, solenoid valves, pilot lights, and small motor starters based on the control program’s logic.As a core component within the SLC 500 platform, the 1746-OV8/A​ is designed for easy integration into a 1746 series I/O chassis, where it occupies a single slot. It represents the “muscle” of the control system, executing the commands determined by the processor’s ladder logic. The module provides electrical isolation between the sensitive internal logic circuits of the PLC and the potentially noisy power circuits of the field devices, enhancing system stability and protection. The value of the Allen-Bradley 1746-OV8/A​ lies in its proven durability, straightforward application, and pivotal role in closing the control loop. It translates complex automation algorithms into actionable physical outputs, enabling machinery to start, stop, position, and sequence operations. Its 8-point configuration offers a cost-effective density for a wide range of machine and process control applications, making it one of the most commonly deployed output modules in the extensive SLC 500 I/O catalog.

Technical Specifications

Main Features and Advantages

The Allen-Bradley 1746-OV8/A​ is distinguished by its robust and reliable solid-state design. Utilizing transistor outputs provides significant advantages over mechanical relay outputs, including faster switching speeds (suitable for pulse outputs up to 1 kHz), silent operation, and a much longer operational life with no moving parts to wear out. The sinking output configuration is a common industry standard, offering compatibility with a vast array of 24V DC industrial devices. Each output is protected by internal electronic fusing, which helps prevent damage to the module from short-circuit or overload conditions on any individual channel, enhancing overall system robustness and reducing maintenance costs. The module’s outputs are arranged in groups (typically two groups of four) with separate common terminals, providing flexible wiring options and allowing different sections of a machine to be powered from separate DC supplies if needed.Ease of use and integration are hallmarks of the Allen-Bradley 1746-OV8/A. Its clear per-point LED indicators provide instant visual confirmation of the output status, which is invaluable for troubleshooting and commissioning. The module interfaces with the SLC 500 processor via the chassis backplane, requiring no complex configuration—it is automatically recognized as an output module. Installation is simplified by the use of removable terminal blocks, which allow wiring to be completed on a bench before the module is snapped into the chassis. The Allen-Bradley 1746-OV8/A​ is designed for the demanding environment of industrial control panels, with a wide operating temperature range and protection against electrical noise. Its proven track record of reliability in countless installations makes it a trusted choice for system integrators and maintenance personnel, ensuring dependable performance for driving the essential actuators that make automated processes function.