The 1794-ASB is an analog input and output adapter module manufactured by Rockwell Automation as part of their Allen-Bradley 1794 Flex I/O series. It is used in programmable logic controller (PLC) systems to provide analog input and output capabilities.

Here are some key features of the 1794-ASB PLC module:

- It supports analog input and output channels.

- The module allows for high-speed analog data exchange between the field devices and the PLC system.

- It features a modular design with removable terminal blocks for easy installation and wiring.

- The 1794-ASB module can be used alongside other modules in the 1794 Flex I/O series to create a customized I/O configuration tailored to the specific application requirements.

- It provides diagnostic indicators for easy troubleshooting and maintenance.

The 1794-ASB module is commonly used in industrial automation applications where precise analog measurements and control are required, such as monitoring temperature, pressure, flow, or level.