Description

Product Overview

The Allen-Bradley 1794-TB3K is a high-reliability terminal base unit from the FLEX™ I/O family, featuring conformal coating for enhanced protection in corrosive environments. It provides the essential mechanical mounting and electrical connection points required to interface field sensors and actuators with the FLEX I/O bus.

Robust Termination Architecture

The 1794-TB3K serves as the fundamental wiring backbone for the FLEX I/O system, offering a specialized 3-wire termination layout. This design specifically accommodates 16 I/O channels along with 18 common and 18 voltage terminals, which simplifies the wiring of sensors that require separate power and return paths. By consolidating these connections into a single compact footprint, the module significantly reduces the need for external terminal blocks. Furthermore, the unit facilitates a “Removal and Insertion Under Power” (RIUP) capability, allowing technicians to replace I/O modules without disrupting the operation of other modules on the same DIN rail.

Industrial Grade Electrical Performance

Engineered for demanding electrical environments, the 1794-TB3K manages up to 10A of current across its terminal structure. This capacity supports various power distribution strategies, including the ability to daisy-chain power to adjacent terminal bases via the integrated power bus. Because it utilizes a screw-clamp termination system, the base ensures a high-integrity physical connection for wires ranging from 24 to 16 AWG. Additionally, the “K” suffix indicates that this specific model features a conformal coating, providing a critical layer of defense against moisture, dust, and chemical contaminants that often compromise standard electronics in heavy industrial zones.

Seamless Mechanical Integration

Installation of the 1794-TB3K involves a simple snap-on procedure to standard 35mm DIN rails, which creates a secure and vibration-resistant assembly. The unit measures approximately 94 x 94 x 69 mm, optimizing cabinet space while maintaining clear access for field wiring. Once mounted, the terminal base forms a communication link through its side-mounted slide-in connectors, extending the FLEX bus to the next module in the series. This modular approach allows for rapid system scaling and troubleshooting. Moreover, the unit meets global safety standards, including UL and CE certifications, ensuring compliance in diverse international automation projects.

Technical Specifications