ALLEN-BRADLEY 1734-OB8S DC Sourcing Output Module for Point I/O

Technical Specifications

Main Features and Advantages

Software-Configurable Channel Flexibility: The defining feature of the ALLEN-BRADLEY 1734-OB8S​ is its ability for each of its eight channels to be individually configured via software as either a sinking digital input or a sourcing digital output. This eliminates the need to stock and manage separate dedicated input and output modules for many applications. It provides unparalleled flexibility for machine builders and system integrators, allowing a single module type to handle varying I/O point mixes on different machines or to easily adapt to last-minute design changes without rewiring or replacing hardware. This reduces inventory costs, simplifies engineering, and speeds up commissioning.High-Density, Space-Saving Design: The module packs eight configurable I/O points into an extremely compact footprint, part of the Point I/O system’s philosophy of placing I/O exactly where it’s needed. This high density saves valuable panel space and allows for the creation of very localized, distributed I/O drops right on the machine. The use of removable terminal bases (like the 1734-TB or TBS) means all field wiring can be terminated to the base unit, allowing the ALLEN-BRADLEY 1734-OB8S​ electronic module to be inserted or removed without disturbing any field wiring, facilitating rapid maintenance and module replacement.Robust Performance and Easy Integration: Designed for industrial environments, the ALLEN-BRADLEY 1734-OB8S​ includes electronic short-circuit protection on each output channel, safeguarding the module from damage. Each point has a bright, two-color LED (green for on/active, red for fault) for clear at-a-glance status indication, which is invaluable for troubleshooting. The module integrates seamlessly into the Allen-Bradley control architecture, communicating over the Point I/O backplane to an adapter module (like the 1734-AENTR EtherNet/IP adapter). This provides deterministic I/O data exchange with ControlLogix or CompactLogix controllers using the native EtherNet/IP protocol, making it a fully integrated component within the Rockwell Automation ecosystem, supported by standard configuration and diagnostic tools.

Application Field

The ALLEN-BRADLEY 1734-OB8S​ is ideally suited for distributed control applications on factory floors where a mix of sensing and actuation is required in a localized area. A classic application is on modular machinery or automated workstations. Here, a single ALLEN-BRADLEY 1734-OB8S​ module might be used to monitor several local limit switches or presence sensors (configured as inputs) while simultaneously controlling indicator lights, solenoid valves for pneumatic actuators, or the coils of small relays (configured as outputs) for that specific station. This consolidates control for a sub-assembly into one compact module.In material handling systems, such as conveyor sections or palletizers, the module can be deployed to interface with photo-eyes or proximity sensors detecting package position (inputs) and to control divertor arms, stoppers, or labeling mechanisms (outputs). Its flexibility allows the exact I/O mix to be tailored to each conveyor zone. Similarly, in packaging machines, it can manage sensors for product detection and fill level, and control solenoids for glue valves, tampers, or product pushers. The high density and configurability make it perfect for these applications with clustered I/O requirements.The module is also extensively used in OEM equipment where a standard machine design is adapted for different customers. The ALLEN-BRADLEY 1734-OB8S​ allows the builder to use a uniform I/O module across all machines, simply configuring the channels as needed for each customer’s specific optional features (e.g., extra safety lights, warning horns, or auxiliary sensors). Its compatibility with the Point I/O system makes it a cornerstone for implementing cost-effective, networked I/O in industries ranging from automotive and food & beverage to semiconductor fabrication, wherever the Allen-Bradley control platform is utilized and flexible, localized I/O is beneficial.