Allen-Bradley 1734-OB4 Output Module

Allen-Bradley 1734-OB4 is a POINT I/O digital output module that provides four 24V DC sourcing outputs for local control of discrete loads in a POINT I/O network. As part of Rockwell Automation's POINT I/O family, the OB4 bolts into a POINT I/O chassis and communicates over the POINT bus to receive command data from the controller. Each of the four channels can energize 24V loads such as relays, solenoids, indicator lamps, and other actuators, enabling compact, distributed control of machines and processes. The module is designed for fast, deterministic switching in industrial environments and supports channel-level isolation from the backplane, helping to protect the controller and other I/O from faults on individual outputs. Typical use cases include machine automation, conveying systems, packaging lines, and process equipment where a compact, modular 24V DC output block is needed in the field-mounted I/O network. The 1734-OB4 is commonly paired with 1734-TB or 1734-TBS wiring bases and integrates with Rockwell's Studio 5000/RSLogix environments for configuration and diagnostics. This 4-channel sourcing output module expands POINT I/O capacity without sacrificing the centralized control advantages of Rockwell's distributed I/O approach, enabling scalable expansion of 24V DC control applications in industrial automation.