The 1794-TB3G is a terminal base module manufactured by Rockwell Automation as part of their Allen-Bradley 1794 Flex I/O series. It serves as a base for connecting various I/O modules to a programmable logic controller (PLC) system.

Here are some key features of the 1794-TB3G terminal base module:

- It provides a platform for mounting and connecting I/O modules in the PLC system.

- The module features a 3-wire terminal base design that allows for easy and secure wiring of field devices.

- It supports up to 8 I/O module slots, providing flexibility for the system configuration.

- The 1794-TB3G modules have built-in DIN rail mounting capability for convenient installation.

- It is compatible with a wide range of I/O modules from the Allen-Bradley 1794 Flex I/O series.

The 1794-TB3G terminal base module is commonly used in industrial control applications where multiple I/O modules need to be connected and interfaced with a PLC system.