Allen-Bradley 1794-TB3GS Flex I/O Spring-Clamp Grounded Terminal Base

The 1794-TB3GS is a 36-point spring-clamp grounded terminal base unit designed for the Allen-Bradley Flex I/O 1794 modular platform. This terminal base serves as the physical mounting and electrical termination interface for various digital and analog I/O modules, providing a robust connection point in industrial control systems.

Features

• Vibration-Resistant Design: Utilizes constant-force spring-clamp (cage clamp) technology to maintain secure wire connections, eliminating the need for periodic retightening.
• Grounded Infrastructure: The "G" and "S" designation indicates integrated chassis grounding, ideal for analog signals and environments with high electromagnetic interference (EMI).
• Flexbus Integration: Features an internal backplane pass-through to distribute logic power and data signals across adjacent Flex I/O modules.
• High-Density Termination: Provides 36 active terminals plus auxiliary common and voltage terminals for efficient field-device wiring.
• Mechanical Keying: Includes a rotatable keyswitch to prevent the insertion of incompatible modules, ensuring system safety and preventing hardware damage.

Applications

The 1794-TB3GS is intended for use in distributed I/O applications where high-density wiring and vibration resistance are required. It is commonly deployed in manufacturing, process control, and material handling systems that utilize the Allen-Bradley Flex I/O platform.

Technical Specifications

Installation Guidelines

• Mounting: Snap the terminal base onto a standard 35mm DIN-rail. Ensure the base is securely locked into position.
• Wiring: Use appropriate wire gauges for the spring-clamp terminals. Strip wires to the manufacturer-specified length to ensure proper contact without exposing excessive copper.
• Keying: Before installing an I/O module, set the mechanical keyswitch on the base to match the keying of the specific module being used.
• Power: Always disconnect field power and system power before installing or removing I/O modules from the terminal base.
• Grounding: Ensure the chassis ground connection is properly established to take advantage of the grounded terminal base design for EMI protection.

FAQ

What is the primary difference between the 1794-TB3GS and standard terminal bases?

The 1794-TB3GS includes integrated chassis grounding (denoted by the "G") and spring-clamp terminals (denoted by the "S"), providing superior vibration resistance and noise immunity compared to standard screw-terminal bases.

Can I use this base with any Flex I/O module?

The 1794-TB3GS is compatible with most 1794 Flex I/O modules, but the mechanical keyswitch must be set correctly to match the specific module to prevent improper installation.