The 1734-OB2 module is a digital output module manufactured by Allen-Bradley (now part of Rockwell Automation). It is designed to work with Allen-Bradley MicroLogix and CompactLogix PLC platforms. 

The 1734-OB2 module provides two discrete digital output points. It uses a 24V DC power supply and is capable of sinking current. Each output point can handle a maximum load of 2A and is protected against short circuits and overloads. The module is commonly used in industrial automation applications to control actuators, solenoids, motor starters, and other devices that require on/off control.

The module is part of the Allen-Bradley POINT I/O family, which offers a flexible and modular approach to system configuration. It can be mounted directly on a terminal base, allowing for easy installation and expansion of the I/O system.

To use the 1734-OB2 module, you would typically program it within the Allen-Bradley programming environment, such as RSLogix 500 or Studio 5000. You would assign the module's digital output points to specific addresses in the PLC's memory and write ladder logic or other programming instructions to control the outputs based on your application requirements.