1794-TB2 Allen-Bradley Flex I/O Terminal Base

Allen-Bradley 1791-TB2 Terminal Base Unit for Flex I/O

Product Introduction

The Allen-Bradley 1794-TB2 provides a rugged wiring foundation for Flex I/O modules. Its cage clamp design holds wires securely without special tools. You can use this base with 24V up to 120V AC/DC signals. Many factories rely on the 1794-TB2 for field device connections. Additionally, this unit supports both panel and DIN rail mounting.

Technical Specifications

Allen-Bradley built the 1794-TB2 with a maximum supply voltage of 125V DC/AC at 50/60Hz. Current capacity reaches 10A. The isolation voltage is 125V continuous. Apply a terminal screw torque between 0.56 and 0.79 Nm. Use stranded copper wire from 0.21 to 1.3 mm² (24 to 16 AWG). Insulation thickness must be 3/64 inch for category 2 wires.

This base unit uses a 2-wire screw termination method. It includes one row of 16 terminals, one row of 18 terminals, and one row of 2 terminals. Therefore, you get plenty of connection points for sensors and actuators. The enclosure type is open, so you must install it inside a control cabinet.

Mechanical & Environmental Parameters

The 1794-TB2 measures 3.7 x 2.7 x 3.7 inches. Operating temperature ranges from 0 to 55 °C. Meanwhile, storage temperature spans -40 to 85 °C. Vibration testing passed 5 g at 10 to 500 Hz. Operating shock withstands 30 g, and non-operating shock reaches 50 g.

Key components on the 1794-TB2 include a female FlexBus connector, a male FlexBus connector, and a cover plug. Furthermore, you will find a key switch, panel mounting holes, I/O terminal strips, a locking tab, and a module locking latch. These features ensure a secure and organized assembly.

Installation Guide

First, mount the 1794-TB2 on a flat panel or standard 35 mm DIN rail. Use 5 to 7 in-lbs of torque for the mounting screws. Next, insert your Flex I/O module into the base unit. Then, lock it using the module locking latch. After that, connect field wiring to the cage clamp terminals. Strip each wire to 8 mm for best contact. Finally, attach the FlexBus connectors to adjacent bases for system expansion.

Isolation voltage between channels depends on the inserted module. Therefore, always check the module's datasheet before mixing voltage levels.

Packaging List

• Allen-Bradley 1794-TB2 terminal base unit (1 piece)

• Cover plug for the male FlexBus connector (1 piece)

• Key switch (pre-installed on the base)

• Product identification label

• Printed quick start guide

Note: This package does not include certificates or warranty documents.

Shipping & Delivery

We ship all orders via FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours after dispatch.

Frequently Asked Questions (FAQ)

1. Can I use the 1794-TB2 with 230V AC signals?
No. The Allen-Bradley 1794-TB2 has a maximum voltage rating of 125V AC/DC. Applying 230V will damage the unit.

2. What wire type does this base unit accept?
It accepts stranded copper wire from 24 to 16 AWG. Insulation must be 3/64 inch thick. Solid wire is not recommended.

3. Does the 1794-TB2 work with every Flex I/O module?
Yes, physically it fits all Flex I/O modules. However, always verify isolation requirements from the module's datasheet.

4. How do I clean this terminal base safely?
Use dry compressed air or a soft brush. Power off the entire system before any cleaning.

5. What shipping methods are available?
We use FedEx, UPS, and DHL for fast and trackable delivery. Express options are available upon request.