Allen Bradley Terminal Base IO Module could refer to an IO module that is designed to be mounted on a terminal or a base, allowing for easy wiring and connections in a structured manner. It might have features such as screw terminals, pluggable connectors, or other means of connecting wires and devices securely.
Rockwell Automation Connection Hardware :-
1734-TOP3 POINT I/O One-piece Terminal Base with Screw Clamp
https://www.asteamtechno.com/products/allen-bradley/1734-top3/
1734-TOP3S POINT I/O One-piece Terminal Base with Spring Clamp
https://www.asteamtechno.com/products/allen-bradley/1734-top3/