Allen-Bradley 1734-OW4: Durable DC Sourcing Output for Harsh Environments

Technical Specifications

Main Features and Advantages

The Allen-Bradley 1734-OW4​ digital output module is designed for robust performance and operational simplicity. A key advantage is its built-in protective circuitry. Each channel incorporates protection against short-circuit, overload, and over-temperature conditions. In the event of a fault, the affected channel will shut down independently to prevent damage to the module itself, while the remaining channels continue to operate normally. This fault tolerance enhances overall system availability. The module also provides a clear diagnostic indicator; when a channel is in a fault state due to a short, its status LED will typically flash, allowing for rapid identification and localization of the problem in the field wiring or connected device, significantly reducing mean time to repair (MTTR).The module offers excellent performance for a wide range of industrial loads. Its 2-amp per point rating is sufficient to directly drive many common actuators like solenoid valves and small contactor coils without requiring an intermediate relay, simplifying panel design and reducing component count. The 1734-OW4​ utilizes a solid-state MOSFET output, providing fast switching speeds (suitable for pulse outputs up to 1 kHz) and a long, maintenance-free service life compared to mechanical relays, as there are no moving parts to wear out. The per-channel LED indicators provide at-a-glance verification that the controller’s output command is being executed, which is essential during commissioning, production, and troubleshooting. The modular design of the POINT I/O system, with the Allen-Bradley 1734-OW4​ as a key component, allows for highly flexible and scalable I/O layouts. Modules can be mixed and matched on the same baseplate to create a custom I/O drop tailored to the exact needs of the machine, and the entire module can be hot-swapped (in supported configurations) without bringing down the entire network, maximizing uptime.

Application Field

The Allen-Bradley 1734-OW4​ is deployed in virtually any discrete manufacturing or process application that requires the automated control of on/off devices. In Material Handling and Packaging machinery, it is commonly used to control divertor arms, gate solenoids, clamp actuators, and indicator lights on conveyors and sortation systems. Its reliable switching ensures precise timing for product routing. Within Automotive Assembly and Welding Lines, the module controls tooling clamps, weld gun actuators, and part presence verification systems, where its durability in high-vibration environments is critical. The localized nature of POINT I/O, with modules like the 1734-OW4, allows for I/O to be placed directly on welding robots or tooling pallets.In Process Industries, such as Water Treatment or Batch Chemical, the Allen-Bradley 1734-OW4​ operates small solenoid valves for chemical dosing, actuates dump valves, and controls pump seal flush systems. Its solid-state reliability is preferred for repetitive cycling applications. In Machine Building (OEM), this module is a staple inside control panels for presses, cutters, and forming machines, where it provides the output signals to hydraulic valves, pneumatic solenoids, and machine cycle start lights. The 1734-OW4​ is also ideal for Building Automation, controlling damper actuators, fan relays, and valve actuators in HVAC systems. Its ability to be distributed via a network backbone makes it perfect for controlling equipment across large facilities. Essentially, wherever a programmable controller needs to turn a 24V DC device on or off, the 1734-OW4​ provides a compact, reliable, and network-integratable solution.