Product Overview

The Allen Bradley 1794-TB3 serves as the essential mounting and wiring foundation for the Flex I/O system. This terminal base unit provides the physical interface and electrical connection point for 1794 I/O modules, enabling seamless communication with the FLEXBus backplane. Designed with a 3-wire cage-clamp termination system, the 1794-TB3 streamlines field wiring for sensors and actuators. We supply this unit as 100% Brand New and Original, ensuring high-integrity signal routing and robust power distribution for distributed control architectures in automotive, water treatment, and material handling industries.

Technical Specifications

Engineering Advantages

• Simplified 3-Wire Termination: The 1794-TB3 features a specialized 3-wire cage-clamp design. This allows engineers to terminate the signal, power (V), and common (COM) wires directly on the base for each I/O point, eliminating the need for external terminal strips and reducing cabinet clutter.

• Modular "Hot Swap" Capability: The terminal base remains stationary while the I/O module plugs into the center. This design allows for "Removal and Insertion Under Power" (RIUP), meaning maintenance teams can replace a faulty I/O module without disconnecting field wiring or shutting down the entire system bus.

• High-Voltage Versatility: Unlike standard low-voltage bases, the 1794-TB3 supports up to 125V AC/DC on the V/COM terminals. This enables the integration of higher voltage field devices—such as 120V AC solenoids or relay coils—directly into the Flex I/O assembly.

• Space-Saving DIN Rail Integration: The compact form factor and integrated DIN rail latching mechanism allow for high-density mounting. The base unit creates the backplane connection automatically when slid alongside adjacent units, significantly reducing assembly time during cabinet builds.

FAQs

What is the benefit of the Cage-Clamp over standard Screw-Terminals?

The cage-clamp system in the 1794-TB3 provides a constant spring-force connection. Unlike traditional screws that can loosen over time due to machine vibration, the cage-clamp maintains a secure, gas-tight seal on the wire, significantly reducing long-term maintenance requirements.

Does the 1794-TB3 come with the I/O module?

No. The 1794-TB3 is a standalone terminal base unit. You must purchase the specific Flex I/O module (e.g., 1794-IB16 or 1794-OB16) separately. This modularity allows you to mix and match different I/O types on the same base platform.

Can I use the 1794-TB3 for analog modules?

While the 1794-TB3 is primarily used for digital I/O due to its 3-wire layout, some analog modules are compatible. However, for high-precision analog signals requiring shielded twisted pairs, we recommend checking the specific 1794 analog module's manual to ensure the TB3 provides sufficient grounding points.

What size wire does the cage-clamp accommodate?

The 1794-TB3 cage-clamps typically accept wire sizes ranging from 0.34 $mm^2$ to 2.5 $mm^2$ (22 to 12 AWG) solid or stranded copper wire, providing flexibility for various industrial wiring standards.