1734-OB2 refers to a specific analog output module in the Allen Bradley (Rockwell Automation) ControlLogix series. The 1734-OB2 is a Digital DC Output module that provides two isolated outputs for controlling DC loads. It is used in conjunction with a ControlLogix chassis and can be programmed and configured using the Rockwell Automation programming software, such as RSLogix 5000 or Studio 5000.

The 1734-OB2 module provides a reliable and flexible solution for interfacing with various DC devices, such as solenoids, motor starters, valves, or other digital output devices. It supports both sourcing and sinking output wiring configurations, allowing it to be compatible with different load types and wiring setups.

With the 1734-OB2 module, users can monitor and control DC outputs in their application, enabling automation and process control. The module offers diagnostic capabilities, such as overcurrent and short circuit protection, which help ensure the safe and efficient operation of the connected devices.