Flex I/O Terminal Base Unit Allen-Bradley 1794-TB3

Product Overview

The 1794-TB3 is a terminal base unit from Allen-Bradley. It belongs to the Flex I/O platform. This unit offers three terminal strips with screw clamps. It connects field devices to I/O modules. The base supports hot-swapping of modules. It draws 640 mA from the backplane at 5 VDC. The voltage rating is 120 VAC, with a maximum current of 10 Amperes. 1794-TB3 enables easy wiring and reliable connections.

Application Scenarios

This terminal base works with many Flex I/O modules. It hosts digital input modules like 1794-IA8 and 1794-IB16. It also supports output modules such as 1794-OB8 and 1794-OB16D. Use it in industrial automation systems. Apply it in manufacturing, process control, and machine building. The daisy-chain feature simplifies power distribution across multiple bases.

Technical Specifications

The 1794-TB3 has 52 terminals. Terminal rows are arranged as: top row with 16 I/O terminals, middle row with 18 common terminals, bottom row with 18 supply terminals. Wire size accepts 0.34 to 3.3 mm². Screw torque is 0.56 to 0.79 Nm. Isolation voltage is 125V continuous. Dimensions are 94 x 94 x 69 mm. Maximum backplane current is 640 mA at 5 VDC. Voltage range is 24 to 120 VAC/DC. Current capacity is 10 Amperes. Daisy-chain connections use terminals C-34 (+) and B-16 (-) for supply in, and C-51 (+) and B-33 (-) for supply out.

Installation & Maintenance Guide

Mount the base on a DIN rail. Hook the top edge over the rail. Push down to lock. Ensure the FlexBus connector engages with the adjacent adapter. Slide the base tightly against the adapter. Connect wires to the screw terminals. Use a screwdriver to tighten to 0.56-0.79 Nm. For daisy-chaining, connect power from one base to the next. Remove the module only after disconnecting power. Keep the base clean and dry. Check connections periodically.

Packing List

The package includes one 1794-TB3 terminal base unit. It also contains installation instructions. No additional accessories are included. Shipping is via FedEx, UPS, or DHL.